Vulnerabilities > CVE-2016-1547 - Improper Input Validation vulnerability in NTP

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
low complexity
ntp
CWE-20
nessus
NVD
Published: 2017-01-06
Updated: 2021-11-17

Summary

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.

Vulnerable Configurations

Part Description Count
Application
Ntp
5

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Nessus

  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-559.NASL
    descriptionSeveral vulnerabilities were discovered in the Network Time Protocol daemon and utility programs : CVE-2015-7974 Matt Street discovered that insufficient key validation allows impersonation attacks between authenticated peers. CVE-2015-7977 / CVE-2015-7978 Stephen Gray discovered that a NULL pointer dereference and a buffer overflow in the handling of
    last seen2020-03-17
    modified2016-07-26
    plugin id92546
    published2016-07-26
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/92546
    titleDebian DLA-559-1 : ntp security update
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-559-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(92546);
  script_version("2.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2015-7974", "CVE-2015-7977", "CVE-2015-7978", "CVE-2015-7979", "CVE-2015-8138", "CVE-2015-8158", "CVE-2016-1547", "CVE-2016-1548", "CVE-2016-1550", "CVE-2016-2516", "CVE-2016-2518");

  script_name(english:"Debian DLA-559-1 : ntp security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Several vulnerabilities were discovered in the Network Time Protocol
daemon and utility programs :

CVE-2015-7974

Matt Street discovered that insufficient key validation allows
impersonation attacks between authenticated peers.

CVE-2015-7977 / CVE-2015-7978

Stephen Gray discovered that a NULL pointer dereference and a buffer
overflow in the handling of 'ntpdc reslist' commands may result in
denial of service.

CVE-2015-7979

Aanchal Malhotra discovered that if NTP is configured for broadcast
mode, an attacker can send malformed authentication packets which
break associations with the server for other broadcast clients.

CVE-2015-8138

Matthew van Gundy and Jonathan Gardner discovered that missing
validation of origin timestamps in ntpd clients may result in denial
of service.

CVE-2015-8158

Jonathan Gardner discovered that missing input sanitising in ntpq may
result in denial of service.

CVE-2016-1547

Stephen Gray and Matthew van Gundy discovered that incorrect handling
of crypto NAK packets my result in denial of service.

CVE-2016-1548

Jonathan Gardner and Miroslav Lichvar discovered that ntpd clients
could be forced to change from basic client/server mode to interleaved
symmetric mode, preventing time synchronisation.

CVE-2016-1550

Matthew van Gundy, Stephen Gray and Loganaden Velvindron discovered
that timing leaks in the the packet authentication code could result
in recovery of a message digest.

CVE-2016-2516

Yihan Lian discovered that duplicate IPs on 'unconfig' directives will
trigger an assert.

CVE-2016-2518

Yihan Lian discovered that an OOB memory access could potentially
crash ntpd.

For Debian 7 'Wheezy', these problems have been fixed in version
1:4.2.6.p5+dfsg-2+deb7u7.

We recommend that you upgrade your ntp packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2016/07/msg00021.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/ntp"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Upgrade the affected ntp, ntp-doc, and ntpdate packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ntp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ntp-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ntpdate");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/07/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/07/26");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2020 Tenable Network Security, Inc.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"ntp", reference:"1:4.2.6.p5+dfsg-2+deb7u7")) flag++;
if (deb_check(release:"7.0", prefix:"ntp-doc", reference:"1:4.2.6.p5+dfsg-2+deb7u7")) flag++;
if (deb_check(release:"7.0", prefix:"ntpdate", reference:"1:4.2.6.p5+dfsg-2+deb7u7")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familySlackware Local Security Checks
    NASL idSLACKWARE_SSA_2016-120-01.NASL
    descriptionNew ntp packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id90800
    published2016-05-02
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/90800
    titleSlackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : ntp (SSA:2016-120-01)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Slackware Security Advisory 2016-120-01. The text 
# itself is copyright (C) Slackware Linux, Inc.
#

include("compat.inc");

if (description)
{
  script_id(90800);
  script_version("2.11");
  script_cvs_date("Date: 2019/03/15 15:35:01");

  script_cve_id("CVE-2015-7704", "CVE-2015-8138", "CVE-2016-1547", "CVE-2016-1548", "CVE-2016-1549", "CVE-2016-1550", "CVE-2016-1551", "CVE-2016-2516", "CVE-2016-2517", "CVE-2016-2518", "CVE-2016-2519");
  script_xref(name:"SSA", value:"2016-120-01");

  script_name(english:"Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : ntp (SSA:2016-120-01)");
  script_summary(english:"Checks for updated package in /var/log/packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Slackware host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"New ntp packages are available for Slackware 13.0, 13.1, 13.37, 14.0,
14.1, and -current to fix security issues."
  );
  # http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.630758
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?41983d03"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected ntp package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:slackware:slackware_linux:ntp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:13.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:13.37");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.1");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/04/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/02");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Slackware Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Slackware/release", "Host/Slackware/packages");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("slackware.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Slackware/release")) audit(AUDIT_OS_NOT, "Slackware");
if (!get_kb_item("Host/Slackware/packages")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Slackware", cpu);


flag = 0;
if (slackware_check(osver:"13.0", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"i486", pkgnum:"1_slack13.0")) flag++;
if (slackware_check(osver:"13.0", arch:"x86_64", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"x86_64", pkgnum:"1_slack13.0")) flag++;

if (slackware_check(osver:"13.1", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"i486", pkgnum:"1_slack13.1")) flag++;
if (slackware_check(osver:"13.1", arch:"x86_64", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"x86_64", pkgnum:"1_slack13.1")) flag++;

if (slackware_check(osver:"13.37", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"i486", pkgnum:"1_slack13.37")) flag++;
if (slackware_check(osver:"13.37", arch:"x86_64", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"x86_64", pkgnum:"1_slack13.37")) flag++;

if (slackware_check(osver:"14.0", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"i486", pkgnum:"1_slack14.0")) flag++;
if (slackware_check(osver:"14.0", arch:"x86_64", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"x86_64", pkgnum:"1_slack14.0")) flag++;

if (slackware_check(osver:"14.1", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"i486", pkgnum:"1_slack14.1")) flag++;
if (slackware_check(osver:"14.1", arch:"x86_64", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"x86_64", pkgnum:"1_slack14.1")) flag++;

if (slackware_check(osver:"current", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"i586", pkgnum:"1")) flag++;
if (slackware_check(osver:"current", arch:"x86_64", pkgname:"ntp", pkgver:"4.2.8p7", pkgarch:"x86_64", pkgnum:"1")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:slackware_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familyOracleVM Local Security Checks
    NASL idORACLEVM_OVMSA-2017-0165.NASL
    descriptionThe remote OracleVM system is missing necessary patches to address critical security updates : - add disable monitor to default ntp.conf [CVE-2013-5211] - fix buffer overflow in datum refclock driver (CVE-2017-6462) - fix crash with invalid unpeer command (CVE-2017-6463) - fix potential crash with invalid server command (CVE-2017-6464) - don
    last seen2020-06-01
    modified2020-06-02
    plugin id104204
    published2017-10-27
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/104204
    titleOracleVM 3.3 / 3.4 : ntp (OVMSA-2017-0165)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from OracleVM
# Security Advisory OVMSA-2017-0165.
#

include("compat.inc");

if (description)
{
  script_id(104204);
  script_version("3.4");
  script_cvs_date("Date: 2019/09/27 13:00:35");

  script_cve_id("CVE-2013-5211", "CVE-2015-7979", "CVE-2016-1547", "CVE-2016-1548", "CVE-2016-1550", "CVE-2016-2518", "CVE-2016-7426", "CVE-2016-7429", "CVE-2016-7433", "CVE-2016-9310", "CVE-2016-9311", "CVE-2017-6462", "CVE-2017-6463", "CVE-2017-6464");
  script_bugtraq_id(64692);

  script_name(english:"OracleVM 3.3 / 3.4 : ntp (OVMSA-2017-0165)");
  script_summary(english:"Checks the RPM output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote OracleVM host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote OracleVM system is missing necessary patches to address
critical security updates :

  - add disable monitor to default ntp.conf [CVE-2013-5211]

  - fix buffer overflow in datum refclock driver
    (CVE-2017-6462)

  - fix crash with invalid unpeer command (CVE-2017-6463)

  - fix potential crash with invalid server command
    (CVE-2017-6464)

  - don't limit rate of packets from sources (CVE-2016-7426)

  - don't change interface from received packets
    (CVE-2016-7429)

  - fix calculation of root distance again (CVE-2016-7433)

  - require authentication for trap commands (CVE-2016-9310)

  - fix crash when reporting peer event to trappers
    (CVE-2016-9311)

  - don't allow spoofed packets to demobilize associations
    (CVE-2015-7979, CVE-2016-1547)

  - don't allow spoofed packet to enable symmetric
    interleaved mode (CVE-2016-1548)

  - check mode of new source in config command
    (CVE-2016-2518)

  - make MAC check resilient against timing attack
    (CVE-2016-1550)"
  );
  # https://oss.oracle.com/pipermail/oraclevm-errata/2017-October/000795.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?7c1983e3"
  );
  # https://oss.oracle.com/pipermail/oraclevm-errata/2017-October/000796.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?9454d3fb"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected ntp / ntpdate packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:ntp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:vm:ntpdate");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:vm_server:3.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:vm_server:3.4");

  script_set_attribute(attribute:"vuln_publication_date", value:"2014/01/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/10/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"OracleVM Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleVM/release", "Host/OracleVM/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/OracleVM/release");
if (isnull(release) || "OVS" >!< release) audit(AUDIT_OS_NOT, "OracleVM");
if (! preg(pattern:"^OVS" + "(3\.3|3\.4)" + "(\.[0-9]|$)", string:release)) audit(AUDIT_OS_NOT, "OracleVM 3.3 / 3.4", "OracleVM " + release);
if (!get_kb_item("Host/OracleVM/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "OracleVM", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

flag = 0;
if (rpm_check(release:"OVS3.3", reference:"ntp-4.2.6p5-12.0.1.el6_9.1")) flag++;
if (rpm_check(release:"OVS3.3", reference:"ntpdate-4.2.6p5-12.0.1.el6_9.1")) flag++;

if (rpm_check(release:"OVS3.4", reference:"ntp-4.2.6p5-12.0.1.el6_9.1")) flag++;
if (rpm_check(release:"OVS3.4", reference:"ntpdate-4.2.6p5-12.0.1.el6_9.1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ntp / ntpdate");
}
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2016-1141.NASL
    descriptionAn update for ntp is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The Network Time Protocol (NTP) is used to synchronize a computer
    last seen2020-06-01
    modified2020-06-02
    plugin id91420
    published2016-06-01
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91420
    titleRHEL 6 / 7 : ntp (RHSA-2016:1141)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2016:1141. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(91420);
  script_version("2.16");
  script_cvs_date("Date: 2019/10/24 15:35:41");

  script_cve_id("CVE-2015-7979", "CVE-2016-1547", "CVE-2016-1548", "CVE-2016-1550", "CVE-2016-2518");
  script_xref(name:"RHSA", value:"2016:1141");

  script_name(english:"RHEL 6 / 7 : ntp (RHSA-2016:1141)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for ntp is now available for Red Hat Enterprise Linux 6 and
Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The Network Time Protocol (NTP) is used to synchronize a computer's
time with another referenced time source. These packages include the
ntpd service which continuously adjusts system time and utilities used
to query and configure the ntpd service.

Security Fix(es) :

* It was found that when NTP was configured in broadcast mode, a
remote attacker could broadcast packets with bad authentication to all
clients. The clients, upon receiving the malformed packets, would
break the association with the broadcast server, causing them to
become out of sync over a longer period of time. (CVE-2015-7979)

* A denial of service flaw was found in the way NTP handled
preemptable client associations. A remote attacker could send several
crypto NAK packets to a victim client, each with a spoofed source
address of an existing associated peer, preventing that client from
synchronizing its time. (CVE-2016-1547)

* It was found that an ntpd client could be forced to change from
basic client/server mode to the interleaved symmetric mode. A remote
attacker could use a spoofed packet that, when processed by an ntpd
client, would cause that client to reject all future legitimate server
responses, effectively disabling time synchronization on that client.
(CVE-2016-1548)

* A flaw was found in the way NTP's libntp performed message
authentication. An attacker able to observe the timing of the
comparison function used in packet authentication could potentially
use this flaw to recover the message digest. (CVE-2016-1550)

* An out-of-bounds access flaw was found in the way ntpd processed
certain packets. An authenticated attacker could use a crafted packet
to create a peer association with hmode of 7 and larger, which could
potentially (although highly unlikely) cause ntpd to crash.
(CVE-2016-2518)

The CVE-2016-1548 issue was discovered by Miroslav Lichvar (Red Hat)."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2016:1141"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2015-7979"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-1547"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-1548"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-1550"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-2518"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntpdate");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:sntp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/01/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/06/01");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^(6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.x / 7.x", "Red Hat " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2016:1141";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntp-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntp-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntp-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntp-debuginfo-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntp-debuginfo-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntp-debuginfo-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", reference:"ntp-doc-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntp-perl-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntp-perl-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntp-perl-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"ntpdate-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"ntpdate-4.2.6p5-10.el6.1")) flag++;

  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"ntpdate-4.2.6p5-10.el6.1")) flag++;


  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ntp-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ntp-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ntp-debuginfo-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ntp-debuginfo-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", reference:"ntp-doc-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", reference:"ntp-perl-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ntpdate-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ntpdate-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"sntp-4.2.6p5-22.el7_2.2")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"sntp-4.2.6p5-22.el7_2.2")) flag++;


  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ntp / ntp-debuginfo / ntp-doc / ntp-perl / ntpdate / sntp");
  }
}
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2016-1552.NASL
    descriptionAn update for ntp is now available for Red Hat Enterprise Linux 6.7 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The Network Time Protocol (NTP) is used to synchronize a computer
    last seen2020-06-01
    modified2020-06-02
    plugin id92718
    published2016-08-04
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/92718
    titleRHEL 6 : ntp (RHSA-2016:1552)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2016:1552. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(92718);
  script_version("2.11");
  script_cvs_date("Date: 2019/10/24 15:35:41");

  script_cve_id("CVE-2015-7979", "CVE-2016-1547", "CVE-2016-1548", "CVE-2016-1550", "CVE-2016-2518");
  script_xref(name:"RHSA", value:"2016:1552");

  script_name(english:"RHEL 6 : ntp (RHSA-2016:1552)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for ntp is now available for Red Hat Enterprise Linux 6.7
Extended Update Support.

Red Hat Product Security has rated this update as having a security
impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The Network Time Protocol (NTP) is used to synchronize a computer's
time with another referenced time source. These packages include the
ntpd service which continuously adjusts system time and utilities used
to query and configure the ntpd service.

Security Fix(es) :

* It was found that when NTP was configured in broadcast mode, a
remote attacker could broadcast packets with bad authentication to all
clients. The clients, upon receiving the malformed packets, would
break the association with the broadcast server, causing them to
become out of sync over a longer period of time. (CVE-2015-7979)

* A denial of service flaw was found in the way NTP handled
preemptable client associations. A remote attacker could send several
crypto NAK packets to a victim client, each with a spoofed source
address of an existing associated peer, preventing that client from
synchronizing its time. (CVE-2016-1547)

* It was found that an ntpd client could be forced to change from
basic client/server mode to the interleaved symmetric mode. A remote
attacker could use a spoofed packet that, when processed by an ntpd
client, would cause that client to reject all future legitimate server
responses, effectively disabling time synchronization on that client.
(CVE-2016-1548)

* A flaw was found in the way NTP's libntp performed message
authentication. An attacker able to observe the timing of the
comparison function used in packet authentication could potentially
use this flaw to recover the message digest. (CVE-2016-1550)

* An out-of-bounds access flaw was found in the way ntpd processed
certain packets. An authenticated attacker could use a crafted packet
to create a peer association with hmode of 7 and larger, which could
potentially (although highly unlikely) cause ntpd to crash.
(CVE-2016-2518)

The CVE-2016-1548 issue was discovered by Miroslav Lichvar (Red Hat)."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2016:1552"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2015-7979"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-1547"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-1548"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-1550"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2016-2518"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntp-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ntpdate");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6.7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/01/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/08/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/08/04");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^6\.7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.7", "Red Hat " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2016:1552";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"i686", reference:"ntp-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"s390x", reference:"ntp-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"x86_64", reference:"ntp-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"i686", reference:"ntp-debuginfo-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"s390x", reference:"ntp-debuginfo-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"x86_64", reference:"ntp-debuginfo-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", reference:"ntp-doc-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"i686", reference:"ntp-perl-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"s390x", reference:"ntp-perl-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"x86_64", reference:"ntp-perl-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"i686", reference:"ntpdate-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"s390x", reference:"ntpdate-4.2.6p5-5.el6_7.5")) flag++;
  if (rpm_check(release:"RHEL6", sp:"7", cpu:"x86_64", reference:"ntpdate-4.2.6p5-5.el6_7.5")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ntp / ntp-debuginfo / ntp-doc / ntp-perl / ntpdate");
  }
}
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3629.NASL
    descriptionSeveral vulnerabilities were discovered in the Network Time Protocol daemon and utility programs : - CVE-2015-7974 Matt Street discovered that insufficient key validation allows impersonation attacks between authenticated peers. - CVE-2015-7977 CVE-2015-7978 Stephen Gray discovered that a NULL pointer dereference and a buffer overflow in the handling of
    last seen2020-06-01
    modified2020-06-02
    plugin id92571
    published2016-07-27
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/92571
    titleDebian DSA-3629-1 : ntp - security update
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-3629. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(92571);
  script_version("2.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/22");

  script_cve_id("CVE-2015-7974", "CVE-2015-7977", "CVE-2015-7978", "CVE-2015-7979", "CVE-2015-8138", "CVE-2015-8158", "CVE-2016-1547", "CVE-2016-1548", "CVE-2016-1550", "CVE-2016-2516", "CVE-2016-2518");
  script_xref(name:"DSA", value:"3629");

  script_name(english:"Debian DSA-3629-1 : ntp - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Several vulnerabilities were discovered in the Network Time Protocol
daemon and utility programs :

  - CVE-2015-7974
    Matt Street discovered that insufficient key validation
    allows impersonation attacks between authenticated
    peers.

  - CVE-2015-7977 CVE-2015-7978
    Stephen Gray discovered that a NULL pointer dereference
    and a buffer overflow in the handling of 'ntpdc reslist'
    commands may result in denial of service.

  - CVE-2015-7979
    Aanchal Malhotra discovered that if NTP is configured
    for broadcast mode, an attacker can send malformed
    authentication packets which break associations with the
    server for other broadcast clients.

  - CVE-2015-8138
    Matthew van Gundy and Jonathan Gardner discovered that
    missing validation of origin timestamps in ntpd clients
    may result in denial of service.

  - CVE-2015-8158
    Jonathan Gardner discovered that missing input
    sanitising in ntpq may result in denial of service.

  - CVE-2016-1547
    Stephen Gray and Matthew van Gundy discovered that
    incorrect handling of crypto NAK packets may result in
    denial of service.

  - CVE-2016-1548
    Jonathan Gardner and Miroslav Lichvar discovered that
    ntpd clients could be forced to change from basic
    client/server mode to interleaved symmetric mode,
    preventing time synchronisation.

  - CVE-2016-1550
    Matthew van Gundy, Stephen Gray and Loganaden Velvindron
    discovered that timing leaks in the packet
    authentication code could result in recovery of a
    message digest.

  - CVE-2016-2516
    Yihan Lian discovered that duplicate IPs on 'unconfig'
    directives will trigger an assert.

  - CVE-2016-2518
    Yihan Lian discovered that an OOB memory access could
    potentially crash ntpd."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2015-7974"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2015-7977"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2015-7978"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2015-7979"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2015-8138"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2015-8158"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2016-1547"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2016-1548"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2016-1550"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2016-2516"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2016-2518"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/ntp"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2016/dsa-3629"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade the ntp packages.

For the stable distribution (jessie), these problems have been fixed
in version 1:4.2.6.p5+dfsg-7+deb8u2."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ntp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/01/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/07/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/07/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"8.0", prefix:"ntp", reference:"1:4.2.6.p5+dfsg-7+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"ntp-doc", reference:"1:4.2.6.p5+dfsg-7+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"ntpdate", reference:"1:4.2.6.p5+dfsg-7+deb8u2")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2016-649.NASL
    descriptionThis update for ntp fixes the following issues : - Update to 4.2.8p7 (boo#977446) : - CVE-2016-1547, boo#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS. - CVE-2016-1548, boo#977461: Interleave-pivot - CVE-2016-1549, boo#977451: Sybil vulnerability: ephemeral association attack. - CVE-2016-1550, boo#977464: Improve NTP security against buffer comparison timing attacks. - CVE-2016-1551, boo#977450: Refclock impersonation vulnerability - CVE-2016-2516, boo#977452: Duplicate IPs on unconfig directives will cause an assertion botch in ntpd. - CVE-2016-2517, boo#977455: remote configuration trustedkey/ requestkey/controlkey values are not properly validated. - CVE-2016-2518, boo#977457: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC. - CVE-2016-2519, boo#977458: ctl_getitem() return value not always checked. - integrate ntp-fork.patch - Improve the fixes for: CVE-2015-7704, CVE-2015-7705, CVE-2015-7974 - Restrict the parser in the startup script to the first occurrance of
    last seen2020-06-05
    modified2016-06-01
    plugin id91403
    published2016-06-01
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91403
    titleopenSUSE Security Update : ntp (openSUSE-2016-649)
  • NASL familyAIX Local Security Checks
    NASL idAIX_IV87939.NASL
    descriptionNTPv3 and NTPv4 are vulnerable to : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7974 NTP could allow a remote authenticated attacker to conduct spoofing attacks, caused by a missing key check. An attacker could exploit this vulnerability to impersonate a peer. NTP could allow a local attacker to bypass security restrictions, caused by the failure to use a constant-time memory comparison function when validating the authentication digest on incoming packets. By sending a specially crafted packet with an authentication payload, an attacker could exploit this vulnerability to conduct a timing attack to compute the value of the valid authentication digest. While the majority OSes implement martian packet filtering in their network stack, at least regarding 127.0.0.0/8, a rare few will allow packets claiming to be from 127.0.0.0/8 that arrive over physical network. On these OSes, if ntpd is configured to use a reference clock an attacker can inject packets over the network that look like they are coming from that reference clock. If ntpd was expressly configured to allow for remote configuration, a malicious user who knows the controlkey for ntpq or the requestkey for ntpdc (if mode7 is expressly enabled) can create a session with ntpd and then send a crafted packet to ntpd that will change the value of the trustedkey, controlkey, or requestkey to a value that will prevent any subsequent authentication with ntpd until ntpd is restarted. NTP is vulnerable to a denial of service, caused by an error when using a specially crafted packet to create a peer association with hmode > 7. An attacker could exploit this vulnerability to cause the MATCH_ASSOC() function to trigger an out-of-bounds read. NTP is vulnerable to a denial of service, caused by the failure to always check the ctl_getitem() function return value. By sending an overly large value, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the demobilization of a preemptable client association. By sending specially crafted crypto NAK packets, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets, an attacker could exploit this vulnerability to cause ntpd to crash. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets to an ephemeral peer target prior to a response being sent, a remote attacker could exploit this vulnerability to demobilize the ephemeral association. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed server packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause a false leap indication to be set. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed CRYPTO_NAK or a bad MAC packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause the autokey association to reset. This plugin has been deprecated to better accommodate iFix supersedence with replacement plugin aix_ntp_v3_advisory7.nasl (plugin id 102128).
    last seen2017-10-29
    modified2017-08-03
    plugin id93352
    published2016-09-08
    reporterTenable
    sourcehttps://www.tenable.com/plugins/index.php?view=single&id=93352
    titleAIX 7.2 TL 0 : ntp (IV87939) (deprecated)
  • NASL familyAIX Local Security Checks
    NASL idAIX_IV87419.NASL
    descriptionNTPv3 and NTPv4 are vulnerable to : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7974 NTP could allow a remote authenticated attacker to conduct spoofing attacks, caused by a missing key check. An attacker could exploit this vulnerability to impersonate a peer. NTP could allow a local attacker to bypass security restrictions, caused by the failure to use a constant-time memory comparison function when validating the authentication digest on incoming packets. By sending a specially crafted packet with an authentication payload, an attacker could exploit this vulnerability to conduct a timing attack to compute the value of the valid authentication digest. While the majority OSes implement martian packet filtering in their network stack, at least regarding 127.0.0.0/8, a rare few will allow packets claiming to be from 127.0.0.0/8 that arrive over physical network. On these OSes, if ntpd is configured to use a reference clock an attacker can inject packets over the network that look like they are coming from that reference clock. If ntpd was expressly configured to allow for remote configuration, a malicious user who knows the controlkey for ntpq or the requestkey for ntpdc (if mode7 is expressly enabled) can create a session with ntpd and then send a crafted packet to ntpd that will change the value of the trustedkey, controlkey, or requestkey to a value that will prevent any subsequent authentication with ntpd until ntpd is restarted. NTP is vulnerable to a denial of service, caused by an error when using a specially crafted packet to create a peer association with hmode > 7. An attacker could exploit this vulnerability to cause the MATCH_ASSOC() function to trigger an out-of-bounds read. NTP is vulnerable to a denial of service, caused by the failure to always check the ctl_getitem() function return value. By sending an overly large value, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the demobilization of a preemptable client association. By sending specially crafted crypto NAK packets, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets, an attacker could exploit this vulnerability to cause ntpd to crash. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets to an ephemeral peer target prior to a response being sent, a remote attacker could exploit this vulnerability to demobilize the ephemeral association. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed server packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause a false leap indication to be set. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed CRYPTO_NAK or a bad MAC packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause the autokey association to reset. This plugin has been deprecated to better accommodate iFix supersedence with replacement plugin aix_ntp_v3_advisory7.nasl (plugin id 102128).
    last seen2017-10-29
    modified2017-08-03
    plugin id93348
    published2016-09-08
    reporterTenable
    sourcehttps://www.tenable.com/plugins/index.php?view=single&id=93348
    titleAIX 6.1 TL 9 : ntp (IV87419) (deprecated)
  • NASL familyAIX Local Security Checks
    NASL idAIX_IV87420.NASL
    descriptionNTPv3 and NTPv4 are vulnerable to : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7974 NTP could allow a remote authenticated attacker to conduct spoofing attacks, caused by a missing key check. An attacker could exploit this vulnerability to impersonate a peer. NTP could allow a local attacker to bypass security restrictions, caused by the failure to use a constant-time memory comparison function when validating the authentication digest on incoming packets. By sending a specially crafted packet with an authentication payload, an attacker could exploit this vulnerability to conduct a timing attack to compute the value of the valid authentication digest. While the majority OSes implement martian packet filtering in their network stack, at least regarding 127.0.0.0/8, a rare few will allow packets claiming to be from 127.0.0.0/8 that arrive over physical network. On these OSes, if ntpd is configured to use a reference clock an attacker can inject packets over the network that look like they are coming from that reference clock. If ntpd was expressly configured to allow for remote configuration, a malicious user who knows the controlkey for ntpq or the requestkey for ntpdc (if mode7 is expressly enabled) can create a session with ntpd and then send a crafted packet to ntpd that will change the value of the trustedkey, controlkey, or requestkey to a value that will prevent any subsequent authentication with ntpd until ntpd is restarted. NTP is vulnerable to a denial of service, caused by an error when using a specially crafted packet to create a peer association with hmode > 7. An attacker could exploit this vulnerability to cause the MATCH_ASSOC() function to trigger an out-of-bounds read. NTP is vulnerable to a denial of service, caused by the failure to always check the ctl_getitem() function return value. By sending an overly large value, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the demobilization of a preemptable client association. By sending specially crafted crypto NAK packets, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets, an attacker could exploit this vulnerability to cause ntpd to crash. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets to an ephemeral peer target prior to a response being sent, a remote attacker could exploit this vulnerability to demobilize the ephemeral association. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed server packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause a false leap indication to be set. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed CRYPTO_NAK or a bad MAC packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause the autokey association to reset. This plugin has been deprecated to better accommodate iFix supersedence with replacement plugin aix_ntp_v3_advisory7.nasl (plugin id 102128).
    last seen2017-10-29
    modified2017-08-03
    plugin id93349
    published2016-09-08
    reporterTenable
    sourcehttps://www.tenable.com/plugins/index.php?view=single&id=93349
    titleAIX 7.1 TL 4 : ntp (IV87420) (deprecated)
  • NASL familyAIX Local Security Checks
    NASL idAIX_NTP_V4_ADVISORY7.NASL
    descriptionThe version of NTP installed on the remote AIX host is affected by the following vulnerabilities : - A time serving flaw exists in the trusted key system due to improper key checks. An authenticated, remote attacker can exploit this to perform impersonation attacks between authenticated peers. (CVE-2015-7974) - A denial of service vulnerability exists due to improper handling of a crafted Crypto NAK Packet with a source address spoofed to match that of an existing associated peer. An unauthenticated, remote attacker can exploit this to demobilize a client association. (CVE-2016-1547) - An information disclosure vulnerability exists in the message authentication functionality in libntp that is triggered during the handling of a series of specially crafted messages. An adjacent attacker can exploit this to partially recover the message digest key. (CVE-2016-1550) - A flaw exists due to improper filtering of IPv4
    last seen2020-06-01
    modified2020-06-02
    plugin id99183
    published2017-04-04
    reporterThis script is Copyright (C) 2017-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/99183
    titleAIX NTP v4 Advisory : ntp_advisory7.asc (IV87278) (IV87279)
  • NASL familyAIX Local Security Checks
    NASL idAIX_IV87614.NASL
    descriptionNTPv3 and NTPv4 are vulnerable to : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7974 NTP could allow a remote authenticated attacker to conduct spoofing attacks, caused by a missing key check. An attacker could exploit this vulnerability to impersonate a peer. NTP could allow a local attacker to bypass security restrictions, caused by the failure to use a constant-time memory comparison function when validating the authentication digest on incoming packets. By sending a specially crafted packet with an authentication payload, an attacker could exploit this vulnerability to conduct a timing attack to compute the value of the valid authentication digest. While the majority OSes implement martian packet filtering in their network stack, at least regarding 127.0.0.0/8, a rare few will allow packets claiming to be from 127.0.0.0/8 that arrive over physical network. On these OSes, if ntpd is configured to use a reference clock an attacker can inject packets over the network that look like they are coming from that reference clock. If ntpd was expressly configured to allow for remote configuration, a malicious user who knows the controlkey for ntpq or the requestkey for ntpdc (if mode7 is expressly enabled) can create a session with ntpd and then send a crafted packet to ntpd that will change the value of the trustedkey, controlkey, or requestkey to a value that will prevent any subsequent authentication with ntpd until ntpd is restarted. NTP is vulnerable to a denial of service, caused by an error when using a specially crafted packet to create a peer association with hmode > 7. An attacker could exploit this vulnerability to cause the MATCH_ASSOC() function to trigger an out-of-bounds read. NTP is vulnerable to a denial of service, caused by the failure to always check the ctl_getitem() function return value. By sending an overly large value, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the demobilization of a preemptable client association. By sending specially crafted crypto NAK packets, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets, an attacker could exploit this vulnerability to cause ntpd to crash. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets to an ephemeral peer target prior to a response being sent, a remote attacker could exploit this vulnerability to demobilize the ephemeral association. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed server packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause a false leap indication to be set. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed CRYPTO_NAK or a bad MAC packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause the autokey association to reset. This plugin has been deprecated to better accommodate iFix supersedence with replacement plugin aix_ntp_v3_advisory7.nasl (plugin id 102128).
    last seen2017-10-29
    modified2017-08-03
    plugin id93350
    published2016-09-08
    reporterTenable
    sourcehttps://www.tenable.com/plugins/index.php?view=single&id=93350
    titleAIX 5.3 TL 12 : ntp (IV87614) (deprecated)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-1278-1.NASL
    descriptionThis update for ntp to 4.2.8p7 fixes the following issues : - CVE-2016-1547, bsc#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS. - CVE-2016-1548, bsc#977461: Interleave-pivot - CVE-2016-1549, bsc#977451: Sybil vulnerability: ephemeral association attack. - CVE-2016-1550, bsc#977464: Improve NTP security against buffer comparison timing attacks. - CVE-2016-1551, bsc#977450: Refclock impersonation vulnerability - CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig directives will cause an assertion botch in ntpd. - CVE-2016-2517, bsc#977455: remote configuration trustedkey/ requestkey/controlkey values are not properly validated. - CVE-2016-2518, bsc#977457: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC. - CVE-2016-2519, bsc#977458: ctl_getitem() return value not always checked. - This update also improves the fixes for: CVE-2015-7704, CVE-2015-7705, CVE-2015-7974 Bugs fixed : - Restrict the parser in the startup script to the first occurrance of
    last seen2020-06-01
    modified2020-06-02
    plugin id91120
    published2016-05-13
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91120
    titleSUSE SLES11 Security Update : ntp (SUSE-SU-2016:1278-1)
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201607-15.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201607-15 (NTP: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in NTP. Please review the CVE identifiers referenced below for details. Impact : A remote attacker could possibly cause a Denial of Service condition. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id92485
    published2016-07-21
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/92485
    titleGLSA-201607-15 : NTP: Multiple vulnerabilities
  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2016-1141.NASL
    descriptionAn update for ntp is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The Network Time Protocol (NTP) is used to synchronize a computer
    last seen2020-06-01
    modified2020-06-02
    plugin id91394
    published2016-06-01
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91394
    titleCentOS 6 / 7 : ntp (CESA-2016:1141)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-1568-1.NASL
    descriptionntp was updated to version 4.2.8p8 to fix 17 security issues. These security issues were fixed : - CVE-2016-4956: Broadcast interleave (bsc#982068). - CVE-2016-2518: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC (bsc#977457). - CVE-2016-2519: ctl_getitem() return value not always checked (bsc#977458). - CVE-2016-4954: Processing spoofed server packets (bsc#982066). - CVE-2016-4955: Autokey association reset (bsc#982067). - CVE-2015-7974: NTP did not verify peer associations of symmetric keys when authenticating packets, which might allowed remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a
    last seen2020-06-01
    modified2020-06-02
    plugin id91663
    published2016-06-17
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91663
    titleSUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1568-1)
  • NASL familyAIX Local Security Checks
    NASL idAIX_IV87615.NASL
    descriptionNTPv3 and NTPv4 are vulnerable to : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7974 NTP could allow a remote authenticated attacker to conduct spoofing attacks, caused by a missing key check. An attacker could exploit this vulnerability to impersonate a peer. NTP could allow a local attacker to bypass security restrictions, caused by the failure to use a constant-time memory comparison function when validating the authentication digest on incoming packets. By sending a specially crafted packet with an authentication payload, an attacker could exploit this vulnerability to conduct a timing attack to compute the value of the valid authentication digest. While the majority OSes implement martian packet filtering in their network stack, at least regarding 127.0.0.0/8, a rare few will allow packets claiming to be from 127.0.0.0/8 that arrive over physical network. On these OSes, if ntpd is configured to use a reference clock an attacker can inject packets over the network that look like they are coming from that reference clock. If ntpd was expressly configured to allow for remote configuration, a malicious user who knows the controlkey for ntpq or the requestkey for ntpdc (if mode7 is expressly enabled) can create a session with ntpd and then send a crafted packet to ntpd that will change the value of the trustedkey, controlkey, or requestkey to a value that will prevent any subsequent authentication with ntpd until ntpd is restarted. NTP is vulnerable to a denial of service, caused by an error when using a specially crafted packet to create a peer association with hmode > 7. An attacker could exploit this vulnerability to cause the MATCH_ASSOC() function to trigger an out-of-bounds read. NTP is vulnerable to a denial of service, caused by the failure to always check the ctl_getitem() function return value. By sending an overly large value, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the demobilization of a preemptable client association. By sending specially crafted crypto NAK packets, an attacker could exploit this vulnerability to cause a denial of service. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets, an attacker could exploit this vulnerability to cause ntpd to crash. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending specially crafted CRYPTO_NAK packets to an ephemeral peer target prior to a response being sent, a remote attacker could exploit this vulnerability to demobilize the ephemeral association. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed server packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause a false leap indication to be set. NTP is vulnerable to a denial of service, caused by the improper handling of packets. By sending spoofed CRYPTO_NAK or a bad MAC packets with correct origin timestamps, a remote attacker could exploit this vulnerability to cause the autokey association to reset. This plugin has been deprecated to better accommodate iFix supersedence with replacement plugin aix_ntp_v3_advisory7.nasl (plugin id 102128).
    last seen2017-10-29
    modified2017-08-03
    plugin id93351
    published2016-09-08
    reporterTenable
    sourcehttps://www.tenable.com/plugins/index.php?view=single&id=93351
    titleAIX 7.1 TL 3 : ntp (IV87615) (deprecated)
  • NASL familyMisc.
    NASL idNTP_4_2_8P7.NASL
    descriptionThe version of the remote NTP server is 3.x or 4.x prior to 4.2.8p7. It is, therefore, affected by the following vulnerabilities : - A denial of service vulnerability exists due to improper validation of the origin timestamp field when handling a Kiss-of-Death (KoD) packet. An unauthenticated, remote attacker can exploit this to cause a client to stop querying its servers, preventing the client from updating its clock. (CVE-2015-7704) - A flaw exists in the receive() function in ntp_proto.c that allows packets with an origin timestamp of zero to bypass security checks. An unauthenticated, remote attacker can exploit this to spoof arbitrary content. (CVE-2015-8138) - A denial of service vulnerability exists due to improper handling of a crafted Crypto NAK Packet with a source address spoofed to match that of an existing associated peer. An unauthenticated, remote attacker can exploit this to demobilize a client association. (CVE-2016-1547) - A denial of service vulnerability exists due to improper handling of packets spoofed to appear to be from a valid ntpd server. An unauthenticated, remote attacker can exploit this to cause NTP to switch from basic client/server mode to interleaved symmetric mode, causing the client to reject future legitimate responses. (CVE-2016-1548) - A race condition exists that is triggered during the handling of a saturation of ephemeral associations. An authenticated, remote attacker can exploit this to defeat NTP
    last seen2020-06-01
    modified2020-06-02
    plugin id90923
    published2016-05-05
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/90923
    titleNetwork Time Protocol Daemon (ntpd) 3.x / 4.x < 4.2.8p7 Multiple Vulnerabilities
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-1555.NASL
    descriptionAccording to the versions of the ntp packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : - It was found that when ntp is configured with rate limiting for all associations the limits are also applied to responses received from its configured sources. A remote attacker who knows the sources can cause a denial of service by preventing ntpd from accepting valid responses from its sources.(CVE-2016-7426) - ntpq in NTP before 4.2.8p7 allows remote attackers to obtain origin timestamps and then impersonate peers via unspecified vectors.(CVE-2015-8139) - A NULL pointer dereference flaw was found in the way ntpd processed
    last seen2020-06-01
    modified2020-06-02
    plugin id125008
    published2019-05-14
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/125008
    titleEulerOS Virtualization 3.0.1.0 : ntp (EulerOS-SA-2019-1555)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-1291-1.NASL
    descriptionThis update for ntp to 4.2.8p7 fixes the following issues : - CVE-2016-1547, bsc#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS. - CVE-2016-1548, bsc#977461: Interleave-pivot - CVE-2016-1549, bsc#977451: Sybil vulnerability: ephemeral association attack. - CVE-2016-1550, bsc#977464: Improve NTP security against buffer comparison timing attacks. - CVE-2016-1551, bsc#977450: Refclock impersonation vulnerability - CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig directives will cause an assertion botch in ntpd. - CVE-2016-2517, bsc#977455: remote configuration trustedkey/ requestkey/controlkey values are not properly validated. - CVE-2016-2518, bsc#977457: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC. - CVE-2016-2519, bsc#977458: ctl_getitem() return value not always checked. - This update also improves the fixes for: CVE-2015-7704, CVE-2015-7705, CVE-2015-7974 Bugs fixed : - Restrict the parser in the startup script to the first occurrance of
    last seen2020-06-01
    modified2020-06-02
    plugin id91159
    published2016-05-16
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91159
    titleSUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1291-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2016-1912-1.NASL
    descriptionNTP was updated to version 4.2.8p8 to fix several security issues and to ensure the continued maintainability of the package. These security issues were fixed : CVE-2016-4953: Bad authentication demobilized ephemeral associations (bsc#982065). CVE-2016-4954: Processing spoofed server packets (bsc#982066). CVE-2016-4955: Autokey association reset (bsc#982067). CVE-2016-4956: Broadcast interleave (bsc#982068). CVE-2016-4957: CRYPTO_NAK crash (bsc#982064). CVE-2016-1547: Validate crypto-NAKs to prevent ACRYPTO-NAK DoS (bsc#977459). CVE-2016-1548: Prevent the change of time of an ntpd client or denying service to an ntpd client by forcing it to change from basic client/server mode to interleaved symmetric mode (bsc#977461). CVE-2016-1549: Sybil vulnerability: ephemeral association attack (bsc#977451). CVE-2016-1550: Improve security against buffer comparison timing attacks (bsc#977464). CVE-2016-1551: Refclock impersonation vulnerability (bsc#977450)y CVE-2016-2516: Duplicate IPs on unconfig directives could have caused an assertion botch in ntpd (bsc#977452). CVE-2016-2517: Remote configuration trustedkey/ requestkey/controlkey values are not properly validated (bsc#977455). CVE-2016-2518: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC (bsc#977457). CVE-2016-2519: ctl_getitem() return value not always checked (bsc#977458). CVE-2015-8158: Potential Infinite Loop in ntpq (bsc#962966). CVE-2015-8138: Zero Origin Timestamp Bypass (bsc#963002). CVE-2015-7979: Off-path Denial of Service (DoS) attack on authenticated broadcast mode (bsc#962784). CVE-2015-7978: Stack exhaustion in recursive traversal of restriction list (bsc#963000). CVE-2015-7977: reslist NULL pointer dereference (bsc#962970). CVE-2015-7976: ntpq saveconfig command allowed dangerous characters in filenames (bsc#962802). CVE-2015-7975: nextvar() missing length check (bsc#962988). CVE-2015-7974: NTP did not verify peer associations of symmetric keys when authenticating packets, which might have allowed remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a
    last seen2020-06-01
    modified2020-06-02
    plugin id93186
    published2016-08-29
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/93186
    titleSUSE SLES10 Security Update : ntp (SUSE-SU-2016:1912-1)
  • NASL familyF5 Networks Local Security Checks
    NASL idF5_BIGIP_SOL11251130.NASL
    descriptionAn off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled. (CVE-2016-1547) An off-path attacker can deny service to ntpd clients by demobilizing preemptable associations using spoofed crypto-NAK packets. This vulnerability involves different code paths than those used by CVE-2015-7979.
    last seen2020-06-01
    modified2020-06-02
    plugin id95961
    published2016-12-21
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/95961
    titleF5 Networks BIG-IP : NTP vulnerability (K11251130)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2016-599.NASL
    descriptionThis update for ntp to 4.2.8p7 fixes the following issues : - CVE-2016-1547, bsc#977459: Validate crypto-NAKs, AKA: CRYPTO-NAK DoS. - CVE-2016-1548, bsc#977461: Interleave-pivot - CVE-2016-1549, bsc#977451: Sybil vulnerability: ephemeral association attack. - CVE-2016-1550, bsc#977464: Improve NTP security against buffer comparison timing attacks. - CVE-2016-1551, bsc#977450: Refclock impersonation vulnerability - CVE-2016-2516, bsc#977452: Duplicate IPs on unconfig directives will cause an assertion botch in ntpd. - CVE-2016-2517, bsc#977455: remote configuration trustedkey/ requestkey/controlkey values are not properly validated. - CVE-2016-2518, bsc#977457: Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC. - CVE-2016-2519, bsc#977458: ctl_getitem() return value not always checked. - This update also improves the fixes for: CVE-2015-7704, CVE-2015-7705, CVE-2015-7974 Bugs fixed : - Restrict the parser in the startup script to the first occurrance of
    last seen2020-06-05
    modified2016-05-20
    plugin id91269
    published2016-05-20
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91269
    titleopenSUSE Security Update : ntp (openSUSE-2016-599)
  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-3096-1.NASL
    descriptionAanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker could use this issue to perform a replay attack. (CVE-2015-7973) Matt Street discovered that NTP incorrectly verified peer associations of symmetric keys. A remote attacker could use this issue to perform an impersonation attack. (CVE-2015-7974) Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled memory. An attacker could possibly use this issue to cause ntpq to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2015-7975) Jonathan Gardner discovered that the NTP ntpq utility incorrectly handled dangerous characters in filenames. An attacker could possibly use this issue to overwrite arbitrary files. (CVE-2015-7976) Stephen Gray discovered that NTP incorrectly handled large restrict lists. An attacker could use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7977, CVE-2015-7978) Aanchal Malhotra discovered that NTP incorrectly handled authenticated broadcast mode. A remote attacker could use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2015-7979) Jonathan Gardner discovered that NTP incorrectly handled origin timestamp checks. A remote attacker could use this issue to spoof peer servers. (CVE-2015-8138) Jonathan Gardner discovered that the NTP ntpq utility did not properly handle certain incorrect values. An attacker could possibly use this issue to cause ntpq to hang, resulting in a denial of service. (CVE-2015-8158) It was discovered that the NTP cronjob incorrectly cleaned up the statistics directory. A local attacker could possibly use this to escalate privileges. (CVE-2016-0727) Stephen Gray and Matthew Van Gundy discovered that NTP incorrectly validated crypto-NAKs. A remote attacker could possibly use this issue to prevent clients from synchronizing. (CVE-2016-1547) Miroslav Lichvar and Jonathan Gardner discovered that NTP incorrectly handled switching to interleaved symmetric mode. A remote attacker could possibly use this issue to prevent clients from synchronizing. (CVE-2016-1548) Matthew Van Gundy, Stephen Gray and Loganaden Velvindron discovered that NTP incorrectly handled message authentication. A remote attacker could possibly use this issue to recover the message digest key. (CVE-2016-1550) Yihan Lian discovered that NTP incorrectly handled duplicate IPs on unconfig directives. An authenticated remote attacker could possibly use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2016-2516) Yihan Lian discovered that NTP incorrectly handled certail peer associations. A remote attacker could possibly use this issue to cause NTP to crash, resulting in a denial of service. (CVE-2016-2518) Jakub Prokes discovered that NTP incorrectly handled certain spoofed packets. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2016-4954) Miroslav Lichvar discovered that NTP incorrectly handled certain packets when autokey is enabled. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2016-4955) Miroslav Lichvar discovered that NTP incorrectly handled certain spoofed broadcast packets. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2016-4956) In the default installation, attackers would be isolated by the NTP AppArmor profile. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id93896
    published2016-10-06
    reporterUbuntu Security Notice (C) 2016-2019 Canonical, Inc. / NASL script (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/93896
    titleUbuntu 12.04 LTS / 14.04 LTS / 16.04 LTS : ntp vulnerabilities (USN-3096-1)
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2016-1141.NASL
    descriptionFrom Red Hat Security Advisory 2016:1141 : An update for ntp is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. The Network Time Protocol (NTP) is used to synchronize a computer
    last seen2020-06-01
    modified2020-06-02
    plugin id91418
    published2016-06-01
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91418
    titleOracle Linux 6 / 7 : ntp (ELSA-2016-1141)
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20160531_NTP_ON_SL6_X.NASL
    descriptionSecurity Fix(es) : - It was found that when NTP was configured in broadcast mode, a remote attacker could broadcast packets with bad authentication to all clients. The clients, upon receiving the malformed packets, would break the association with the broadcast server, causing them to become out of sync over a longer period of time. (CVE-2015-7979) - A denial of service flaw was found in the way NTP handled preemptable client associations. A remote attacker could send several crypto NAK packets to a victim client, each with a spoofed source address of an existing associated peer, preventing that client from synchronizing its time. (CVE-2016-1547) - It was found that an ntpd client could be forced to change from basic client/server mode to the interleaved symmetric mode. A remote attacker could use a spoofed packet that, when processed by an ntpd client, would cause that client to reject all future legitimate server responses, effectively disabling time synchronization on that client. (CVE-2016-1548) - A flaw was found in the way NTP
    last seen2020-03-18
    modified2016-06-17
    plugin id91644
    published2016-06-17
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91644
    titleScientific Linux Security Update : ntp on SL6.x, SL7.x i386/x86_64 (20160531)
  • NASL familyOracleVM Local Security Checks
    NASL idORACLEVM_OVMSA-2016-0082.NASL
    descriptionThe remote OracleVM system is missing necessary patches to address critical security updates : - don
    last seen2020-06-01
    modified2020-06-02
    plugin id91419
    published2016-06-01
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/91419
    titleOracleVM 3.3 / 3.4 : ntp (OVMSA-2016-0082)
  • NASL familyJunos Local Security Checks
    NASL idJUNIPER_SPACE_JSA_10826.NASL
    descriptionAccording to its self-reported version number, the version of Junos Space running on the remote device is < 17.1R1, and is therefore affected by multiple vulnerabilities.
    last seen2020-06-01
    modified2020-06-02
    plugin id104100
    published2017-10-23
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/104100
    titleJuniper Junos Space < 17.1R1 Multiple Vulnerabilities (JSA10826)
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_B2487D9A0C3011E6ACD0D050996490D0.NASL
    descriptionNetwork Time Foundation reports : NTF
    last seen2020-06-01
    modified2020-06-02
    plugin id90742
    published2016-04-27
    reporterThis script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/90742
    titleFreeBSD : ntp -- multiple vulnerabilities (b2487d9a-0c30-11e6-acd0-d050996490d0)
  • NASL familyMisc.
    NASL idARISTA_EOS_SA0019.NASL
    descriptionThe version of Arista Networks EOS running on the remote device is affected by multiple vulnerabilities : - A flaw exists in NTP in the receive() function within file ntpd/ntp_proto.c that allows packets with an origin timestamp of zero to bypass security checks. An unauthenticated, remote attacker can exploit this to spoof arbitrary content. (CVE-2015-8138) - A flaw exists in NTP when handling crafted Crypto NAK Packets having spoofed source addresses that match an existing associated peer. A unauthenticated, remote attacker can exploit this to demobilize a client association, resulting in a denial of service condition. (CVE-2016-1547) - A flaw exists in NTP when handling packets that have been spoofed to appear to be coming from a valid ntpd server, which may cause a switch to interleaved symmetric mode. An unauthenticated, remote attacker can exploit this, via a packet having a spoofed timestamp, to cause the client to reject future legitimate server responses, resulting in a denial of service condition. (CVE-2016-1548) - A flaw exits in NTP when handling a saturation of ephemeral associations. An authenticated, remote attacker can exploit this to defeat the clock selection algorithm and thereby modify a victim
    last seen2020-03-17
    modified2018-02-28
    plugin id107061
    published2018-02-28
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/107061
    titleArista Networks EOS Multiple Vulnerabilities (SA0019)

Redhat

advisories
  • rhsa
    idRHSA-2016:1141
  • rhsa
    idRHSA-2016:1552
rpms
  • ntp-0:4.2.6p5-10.el6.1
  • ntp-0:4.2.6p5-22.el7_2.2
  • ntp-debuginfo-0:4.2.6p5-10.el6.1
  • ntp-debuginfo-0:4.2.6p5-22.el7_2.2
  • ntp-doc-0:4.2.6p5-10.el6.1
  • ntp-doc-0:4.2.6p5-22.el7_2.2
  • ntp-perl-0:4.2.6p5-10.el6.1
  • ntp-perl-0:4.2.6p5-22.el7_2.2
  • ntpdate-0:4.2.6p5-10.el6.1
  • ntpdate-0:4.2.6p5-22.el7_2.2
  • sntp-0:4.2.6p5-22.el7_2.2
  • ntp-0:4.2.6p5-5.el6_7.5
  • ntp-debuginfo-0:4.2.6p5-5.el6_7.5
  • ntp-doc-0:4.2.6p5-5.el6_7.5
  • ntp-perl-0:4.2.6p5-5.el6_7.5
  • ntpdate-0:4.2.6p5-5.el6_7.5

Seebug

  • bulletinFamilyexploit
    description### SUMMARY An off-path attacker can cause a preemptible client association to be demobilized by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled. Furthermore, if the attacker keeps sending crypto NAK packets, for example every one second, the victim never has a chance to reestablish the association and synchronize time with the legitimate server. ### TESTED VERSIONS ntp 4.2.8p3 ntp 4.2.8p4 NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 ### PRODUCT URLs http://www.ntp.org http://www.ntpsec.org/ ### DETAILS The root cause of this defect is an error in ntp_proto.c that causes an association to be demobilized with a call to the unpeer() function when a crypto-NAK packet is received and FLAG_PREEMPT is set for the peer. The defect occurs when an unauthenticated crypto-NAK packet with the source address of an existing peer with whom the client has a preemptible association reaches the following code: ``` 1292 /* 1293 * If this is a crypto_NAK, the server cannot authenticate a 1294 * client packet. The server might have just changed keys. Clear 1295 * the association and restart the protocol. 1296 */ 1297 if (is_authentic == AUTH_CRYPTO) { 1298 report_event(PEVNT_AUTH, peer, "crypto_NAK"); 1299 peer->flash |= TEST5; /* bad auth */ 1300 peer->badauth++; 1301 if (peer->flags & FLAG_PREEMPT) { 1302 unpeer(peer); 1303 return; 1304 } ... 1319 } ``` Since the packet is a crypto-NAK, and the client has a preemptible association with the peer, isauthentic == AUTHCRYPTO will be true, the FLAG_PREEMPT bit will be set in peer->flags, and the call to unpeer() will occur. The documentation states that preemptible associations are created when the preempt flag is specified with the server command in the NTP configuration or upon arrival of an automatic server discovery packet. Examination of the code reveals that preemptible associations are created in the following ways: 1. CONFIGURATION: A preempt flag is parsed in the the NTP configuration file will cause peer flags to have the FLAG_PREEMPT flag set. ntpconfig.c: 3686 case TPreempt: 3687 peerflags |= FLAG_PREEMPT; 3688 break; 2. BROADCAST, MULTICAST: There are two places where broadcast and multicast associations can be created. The first packet from either a broadcast server or multicast server is received, the client is configured as a broadcast or multicast client, and sys_bdelay != 0. One example of when this will occur is when a broadcast delay is specified in the configuration. ``` ntp_proto.c: 985 case AM_NEWBCL: ... 1045 if (sys_bdelay != 0) { ... 1061 peer = newpeer(&rbufp->recv_srcadr, NULL, 1062 match_ep, MODE_BCLIENT, hisversion, 1063 pkt->ppoll, pkt->ppoll, FLAG_PREEMPT, 1064 MDF_BCLNT, 0, skeyid, sys_ident); ... 1072 break; 1073 } ``` The second case occurs when the first packet from a broadcast or multicast server is received, the client is a broadcast or multicast client, and sys_bdelay == 0. ``` ntp_proto.c: 985 case AM_NEWBCL: ... 1083 peer = newpeer(&rbufp->recv_srcadr, NULL, match_ep, 1084 MODE_CLIENT, hisversion, pkt->ppoll, pkt->ppoll, 1085 FLAG_BC_VOL | FLAG_IBURST | FLAG_PREEMPT, MDF_BCLNT, 1086 0, skeyid, sys_ident); ``` 1. MANYCAST, POOL: A manycast server mode packet is received in response to a client mode packet sent to a multicast group address for manycastclient or a unicast address for pool. ``` ntpproto.c: 921 case AMMANYCAST: ... 952 peer = newpeer(&rbufp->recvsrcadr, NULL, rbufp->dstadr, 953 MODECLIENT, hisversion, peer2->minpoll, 954 peer2->maxpoll, FLAGPREEMPT | 955 (FLAGIBURST & peer2->flags), MDFUCAST | 956 MDFUCLNT, 0, skeyid, sys_ident); ``` In our virtualized testbed, we were able to cause demobilization of preemptible associations and denial of service in each of these cases. ### MITIGATION The underlying causes of this defect are similar to those of other recent defects reported by Cisco and Boston University. Specifically, they are similar to those of the the NAK-to-the-Future defect discovered by Matthew Van Gundy and the off-path authenticated broadcast mode denial of service discovered by Aanchal Malhotra. The recommendations are likewise similar: 1. Packets that fail to authenticate in authenticated modes should be discarded prior to being allowed to change the state of NTP. Because crypto-NAKs are not authenticated, changing state upon receipt of a crypto-NAK may introduce vulnerabilities which affect integrity and availability. RFC 5905 does not specify any required actions for clients to take upon receipt of a crypto-NAK packet. As a result, it may be safe for clients to ignore crypto-NAK packets entirely. 2. Even in unauthenticated modes, more sanity checks, such as origin timestamp validation, should take place to ensure that the packet being received is likely legitimate. ### TIMELINE * 2016-01-19 - CERT reports to NTP * 2016-04-26 - Public disclosure
    idSSV:96787
    last seen2017-11-19
    modified2017-10-26
    published2017-10-26
    reporterRoot
    titleNetwork Time Protocol Crypto-NAK Preemptible Association Denial of Service Vulnerability(CVE-2016-1547)
  • bulletinFamilyexploit
    description### Summary An exploitable denial of service vulnerability exists in the trap functionality of ntpd. If an ntpd instance is configured to send traps, a specially crafted network packet can be used to cause a null pointer dereference resulting in a denial of service. This vulnerability can be triggered by a remote unauthenticated attacker. ### Tested Versions * NTP 4.2.8p8 * NTPsec 0.9.3 ### Product URLs * http://www.ntp.org * http://www.ntpsec.org/ ### CVSS Scores CVSSv2: 7.1 - (AV:N/AC:M/Au:N/C:N/I:N/A:C) CVSSv3: 5.9 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H ### Details When reporting traps, the ntpd reportevent(err, peer, str) function asserts that peer != NULL if err is a "peer event". Thus if reportevent() can be called with NULL peer parameter, ntpd will abort() causing a DoS condition. ntp-4.2.8p7 introduced a variety of validity checks on crypto-NAK packets to address the nak-dos vulnerability (CVE-2016-1547). When any of these validity checks fail, ntpd reports an event to any trap receivers with: reportevent(PEVNTAUTH, peer, "Invalid_NAK"). If the source address and mode of the incoming crypto-NAK packet do not correspond to an existing peer, the peer argument will be NULL causing the INSIST(peer != NULL) assertion to fail when report_event() attempts to report the event to its trap recipients. It may also be possible to trigger reporting of a peer event without a valid peer on other code paths. For example, checkleapsec() in ntptimer.c calls: ``` report_event(PEVNT_ARMED, sys_peer, NULL); ``` If ntpd's syspeer advertises a leap second and then the host running ntpd becomes temporarily disconnected, it may be possible for checkleapsec() to be called without a valid sys_peer leading to the assertion failure above. This crash can be reliably triggered on ntp-4.2.8p8. We are reporting this defect against NTPsec 0.9.3 as well because it contains the same incorrect logic in reportevent(). However we did not attempt to exploit this vulnerability on NTPsec because triggering a call to reportevent() with a NULL peer is not as straightforward as with ntp-4.2.8p8. The fix for CRYPTO_NAK crash (CVE-2016-4957) introduced in ntp-4.2.8p8 does not address this vulnerability. Though traps are not configured in most common NTP environments, attackers can employ "Network Time Protocol Control Mode Unauthenticated Trap Information Disclosure and DDoS Amplification Vulnerability" (TALOS-2016-0203) in order to configure a trap in order to exploit this vulnerability. ### Mitigation Successful exploitation of this vulnerability requires ntpd to be configured with trap recipients. Systems can be protected by removing all "trap" commands from ntp.conf and adopting the mitigations for "Network Time Protocol Control Mode Unauthenticated Trap Information Disclosure and DDoS Amplification Vulnerability" (TALOS-2016-0203). ### Timeline * 2016-09-20 - Vendor Disclosure * 2016-11-21 - Public Release
    idSSV:96649
    last seen2017-11-19
    modified2017-10-11
    published2017-10-11
    reporterRoot
    titleNetwork Time Protocol Trap Crash Denial of Service Vulnerability(CVE-2016-9311)

Talos

References