Vulnerabilities > CVE-2015-8370 - Permissions, Privileges, and Access Controls vulnerability in multiple products

047910
CVSS 0.0 - NONE
Attack vector
UNKNOWN
Attack complexity
UNKNOWN
Privileges required
UNKNOWN
Confidentiality impact
UNKNOWN
Integrity impact
UNKNOWN
Availability impact
UNKNOWN
gnu
fedoraproject
CWE-264
nessus
NVD
Published: 2015-12-16
Updated: 2024-01-16

Summary

Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.

Vulnerable Configurations

Part Description Count
Application
Gnu
5
OS
Fedoraproject
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Accessing, Modifying or Executing Executable Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Blue Boxing
    This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
  • Target Programs with Elevated Privileges
    This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.

Nessus

  • NASL familyPhotonOS Local Security Checks
    NASL idPHOTONOS_PHSA-2016-0012_GRUB2.NASL
    descriptionAn update of the grub2 package has been released.
    last seen2020-03-17
    modified2019-02-07
    plugin id121648
    published2019-02-07
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121648
    titlePhoton OS 1.0: Grub2 PHSA-2016-0012
    code
    #
# (C) Tenable Network Security, Inc.
#


# The descriptive text and package checks in this plugin were
# extracted from VMware Security Advisory PHSA-2016-0012. The text
# itself is copyright (C) VMware, Inc.


include('compat.inc');

if (description)
{
  script_id(121648);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2019/02/07");

  script_cve_id("CVE-2015-8370");

  script_name(english:"Photon OS 1.0: Grub2 PHSA-2016-0012");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote PhotonOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"An update of the grub2 package has been released.");
  script_set_attribute(attribute:"see_also", value:"https://github.com/vmware/photon/wiki/Security-Updates-12.md");
  script_set_attribute(attribute:"solution", value:
"Update the affected Linux packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-9555");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/12/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:grub2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:photonos:1.0");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"PhotonOS Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/PhotonOS/release", "Host/PhotonOS/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/PhotonOS/release");
if (isnull(release) || release !~ "^VMware Photon") audit(AUDIT_OS_NOT, "PhotonOS");
if (release !~ "^VMware Photon (?:Linux|OS) 1\.0(\D|$)") audit(AUDIT_OS_NOT, "PhotonOS 1.0");

if (!get_kb_item("Host/PhotonOS/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, "PhotonOS", cpu);

flag = 0;

if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-2.02-5.ph1")) flag++;
if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-efi-2.02-3.ph1")) flag++;
if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-efi-lang-2.02-3.ph1")) flag++;
if (rpm_check(release:"PhotonOS-1.0", reference:"grub2-lang-2.02-5.ph1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "grub2");
}
  • NASL familyPhotonOS Local Security Checks
    NASL idPHOTONOS_PHSA-2016-0012.NASL
    descriptionAn update of [ linux , wget , vim , grub2 , zookeeper , nginx , dnsmasq , haproxy ] packages for PhotonOS has been released.
    last seen2019-02-21
    modified2019-02-07
    plugin id111846
    published2018-08-17
    reporterTenable
    sourcehttps://www.tenable.com/plugins/index.php?view=single&id=111846
    titlePhoton OS 1.0: Dnsmasq / Grub2 / Haproxy / Linux / Nginx / Vim / Wget / Zookeeper PHSA-2016-0012 (deprecated)
    code
    #
# (C) Tenable Network Security, Inc.
#
# @DEPRECATED@
#
# Disabled on 2/7/2019
#

# The descriptive text and package checks in this plugin were
# extracted from VMware Security Advisory PHSA-2016-0012. The text
# itself is copyright (C) VMware, Inc.

include("compat.inc");

if (description)
{
  script_id(111846);
  script_version("1.3");
  script_cvs_date("Date: 2019/04/05 23:25:07");

  script_cve_id(
    "CVE-2015-8370",
    "CVE-2015-8899",
    "CVE-2016-1248",
    "CVE-2016-4450",
    "CVE-2016-5017",
    "CVE-2016-5360",
    "CVE-2016-7098",
    "CVE-2016-9083",
    "CVE-2016-9555"
  );

  script_name(english:"Photon OS 1.0: Dnsmasq / Grub2 / Haproxy / Linux / Nginx / Vim / Wget / Zookeeper PHSA-2016-0012 (deprecated)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"This plugin has been deprecated.");
  script_set_attribute(attribute:"description", value:
"An update of [ linux , wget , vim , grub2 , zookeeper , nginx ,
dnsmasq , haproxy ] packages for PhotonOS has been released.");
  # https://github.com/vmware/photon/wiki/Security-Updates-12
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b465880d");
  script_set_attribute(attribute:"solution", value:"n/a.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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:"cvss_score_source", value:"CVE-2016-9555");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:dnsmasq");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:grub2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:haproxy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:linux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:vim");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:wget");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:zookeeper");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:photonos:1.0");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"PhotonOS Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

exit(0, "This plugin has been deprecated.");

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/PhotonOS/release");
if (isnull(release) || release !~ "^VMware Photon") audit(AUDIT_OS_NOT, "PhotonOS");
if (release !~ "^VMware Photon (?:Linux|OS) 1\.0(\D|$)") audit(AUDIT_OS_NOT, "PhotonOS 1.0");

if (!get_kb_item("Host/PhotonOS/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, "PhotonOS", cpu);

flag = 0;

pkgs = [
  "dnsmasq-2.76-1.ph1",
  "dnsmasq-debuginfo-2.76-1.ph1",
  "grub2-2.02-5.ph1",
  "grub2-efi-2.02-3.ph1",
  "grub2-efi-lang-2.02-3.ph1",
  "grub2-lang-2.02-5.ph1",
  "haproxy-1.6.10-1.ph1",
  "haproxy-debuginfo-1.6.10-1.ph1",
  "haproxy-doc-1.6.10-1.ph1",
  "linux-4.4.35-1.ph1",
  "linux-api-headers-4.4.35-1.ph1",
  "linux-debuginfo-4.4.35-1.ph1",
  "linux-dev-4.4.35-1.ph1",
  "linux-docs-4.4.35-1.ph1",
  "linux-drivers-gpu-4.4.35-1.ph1",
  "linux-esx-4.4.35-1.ph1",
  "linux-esx-debuginfo-4.4.35-1.ph1",
  "linux-esx-devel-4.4.35-1.ph1",
  "linux-esx-docs-4.4.35-1.ph1",
  "linux-oprofile-4.4.35-1.ph1",
  "linux-sound-4.4.35-1.ph1",
  "linux-tools-4.4.35-1.ph1",
  "linux-tools-debuginfo-4.4.35-1.ph1",
  "nginx-1.10.0-4.ph1",
  "nginx-debuginfo-1.10.0-4.ph1",
  "vim-7.4-6.ph1",
  "vim-extra-7.4-6.ph1",
  "wget-1.18-1.ph1",
  "wget-debuginfo-1.18-1.ph1",
  "zookeeper-3.4.9-1.ph1"
];

foreach (pkg in pkgs)
  if (rpm_check(release:"PhotonOS-1.0", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "dnsmasq / grub2 / haproxy / linux / nginx / vim / wget / zookeeper");
}
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2015-2385-1.NASL
    descriptionThis update for grub2 provides the following fixes : A security issues with a bufferoverflow when reading username and password was fixed (bsc#956631, CVE-2015-8370) Also following bugs were fixed : - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) - Add grub.xen config searching path on boot partition. (bsc#884828) - Add linux16 and initrd16 to grub.xen. (bsc#884830) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE 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 id87668
    published2015-12-30
    reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87668
    titleSUSE SLED11 / SLES11 Security Update : grub2 (SUSE-SU-2015:2385-1)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2015:2385-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(87668);
  script_version("2.6");
  script_cvs_date("Date: 2019/09/11 11:22:12");

  script_cve_id("CVE-2015-8370");

  script_name(english:"SUSE SLED11 / SLES11 Security Update : grub2 (SUSE-SU-2015:2385-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for grub2 provides the following fixes :

A security issues with a bufferoverflow when reading username and
password was fixed (bsc#956631, CVE-2015-8370)

Also following bugs were fixed :

  - Fix buffer overflows when reading username and password.
    (bsc#956631, CVE-2015-8370)

  - Expand list of grub.cfg search path in PV Xen guests for
    systems installed on btrfs snapshots. (bsc#946148,
    bsc#952539)

  - Add grub.xen config searching path on boot partition.
    (bsc#884828)

  - Add linux16 and initrd16 to grub.xen. (bsc#884830)

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE 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://bugzilla.suse.com/show_bug.cgi?id=884828"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=884830"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=946148"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=952539"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=954592"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=956631"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2015-8370/"
  );
  # https://www.suse.com/support/update/announcement/2015/suse-su-20152385-1.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?befd91fa"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server 11-SP4 :

zypper in -t patch slessp4-grub2-12288=1

SUSE Linux Enterprise Desktop 11-SP4 :

zypper in -t patch sledsp4-grub2-12288=1

SUSE Linux Enterprise Debuginfo 11-SP4 :

zypper in -t patch dbgsp4-grub2-12288=1

To bring your system up-to-date, use 'zypper patch'."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:novell:suse_linux:grub2-x86_64-efi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:grub2-x86_64-xen");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/12/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/30");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLED11|SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED11 / SLES11", "SUSE " + os_ver);

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

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);
if (cpu >!< "x86_64") audit(AUDIT_ARCH_NOT, "x86_64", cpu);


sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP4", os_ver + " SP" + sp);
if (os_ver == "SLED11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLED11 SP4", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-efi-2.00-0.54.2")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-xen-2.00-0.54.2")) flag++;
if (rpm_check(release:"SLED11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-efi-2.00-0.54.2")) flag++;
if (rpm_check(release:"SLED11", sp:"4", cpu:"x86_64", reference:"grub2-x86_64-xen-2.00-0.54.2")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "grub2");
}
  • NASL familySlackware Local Security Checks
    NASL idSLACKWARE_SSA_2015-351-01.NASL
    descriptionNew grub packages are available for Slackware 14.1 and -current to fix a security issue.
    last seen2020-06-01
    modified2020-06-02
    plugin id87477
    published2015-12-18
    reporterThis script is Copyright (C) 2015 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/87477
    titleSlackware 14.1 / current : grub (SSA:2015-351-01)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-368.NASL
    descriptionHector Marco-Gisbert, from the Universitat Polit&egrave;cnica de Val&egrave;ncia Cybersecurity Team, reported a buffer overflow in grub2 when checking password during bootup. For Debian 6
    last seen2020-03-17
    modified2015-12-14
    plugin id87330
    published2015-12-14
    reporterThis script is Copyright (C) 2015-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/87330
    titleDebian DLA-368-1 : grub2 security update
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2016-10.NASL
    description - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) - Check MS-DOS header to find PE file header. (bsc#954126) - Use dirname for copying Xen kernel and initrd to esp. (bsc#955493) - Fix reading password by grub2-mkpasswd-pbdk2 without controlling tty. (bsc#954519) - Add luks, gcry_rijndael and gcry_sha1 to signed EFI image to support LUKS partition in default setup. (bsc#917427, bsc#955609) - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) This update was imported from the SUSE:SLE-12-SP1:Update update project.
    last seen2020-06-05
    modified2016-01-07
    plugin id87772
    published2016-01-07
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/87772
    titleopenSUSE Security Update : grub2 (openSUSE-2016-10)
  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-2836-1.NASL
    descriptionHector Marco and Ismael Ripoll discovered that GRUB incorrectly handled the backspace key when configured to use authentication. A local attacker could use this issue to bypass GRUB password protection. 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 id87408
    published2015-12-16
    reporterUbuntu Security Notice (C) 2015-2019 Canonical, Inc. / NASL script (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87408
    titleUbuntu 12.04 LTS / 14.04 LTS / 15.04 / 15.10 : grub2 vulnerability (USN-2836-1)
  • NASL familyF5 Networks Local Security Checks
    NASL idF5_BIGIP_SOL25901386.NASL
    descriptionMultiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an
    last seen2020-06-01
    modified2020-06-02
    plugin id87904
    published2016-01-14
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87904
    titleF5 Networks BIG-IP : GRUB2 vulnerability (SOL25901386)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2015-2399-1.NASL
    descriptionThis update for grub2 provides the following fixes and enhancements : Security issue fixed : - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) Non security issues fixed : - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) - Add --image switch to force zipl update to specific kernel. (bsc#928131) - Do not use shim lock protocol for reading PE header as it won
    last seen2020-06-01
    modified2020-06-02
    plugin id87722
    published2016-01-04
    reporterThis script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87722
    titleSUSE SLED12 / SLES12 Security Update : grub2 (SUSE-SU-2015:2399-1)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2015-2387-1.NASL
    description - Fix buffer overflows when reading username and password. (bsc#956631, CVE-2015-8370) - Check MS-DOS header to find PE file header. (bsc#954126) - Use dirname for copying Xen kernel and initrd to esp. (bsc#955493) - Fix reading password by grub2-mkpasswd-pbdk2 without controlling tty. (bsc#954519) - Add luks, gcry_rijndael and gcry_sha1 to signed EFI image to support LUKS partition in default setup. (bsc#917427, bsc#955609) - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE 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 id87670
    published2015-12-30
    reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87670
    titleSUSE SLED12 / SLES12 Security Update : grub2 (SUSE-SU-2015:2387-1)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3421.NASL
    descriptionHector Marco and Ismael Ripoll, from Cybersecurity UPV Research Group, found an integer underflow vulnerability in Grub2, a popular bootloader. A local attacker can bypass the Grub2 authentication by inserting a crafted input as username or password. More information: http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html CVE-2015-8370
    last seen2020-06-01
    modified2020-06-02
    plugin id87428
    published2015-12-17
    reporterThis script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87428
    titleDebian DSA-3421-1 : grub2 - security update
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201512-03.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201512-03 (GRUB: Authentication bypass) An integer underflow in GRUB&rsquo;s username/password authentication code has been discovered. Impact : An attacker with access to the system console may bypass the username prompt by entering a sequence of backspace characters, allowing them e.g. to get full access to GRUB&rsquo;s console or to load a customized kernel. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id87516
    published2015-12-21
    reporterThis script is Copyright (C) 2015 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/87516
    titleGLSA-201512-03 : GRUB: Authentication bypass
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20151215_GRUB2_ON_SL7_X.NASL
    descriptionA flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : - When upgrading from Scientific Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file.
    last seen2020-03-18
    modified2015-12-22
    plugin id87586
    published2015-12-22
    reporterThis script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87586
    titleScientific Linux Security Update : grub2 on SL7.x x86_64 (20151215)
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2015-2623.NASL
    descriptionUpdated grub2 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. [Updated 27 January 2016] This advisory has been updated to document additional steps that need to be performed on BIOS-based systems after installing this update. No changes were made to the packages included in the advisory. The grub2 packages provide version 2 of the Grand Unified Bootloader (GRUB), a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : * When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file. (BZ#1290089) All grub2 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For this update to take effect on BIOS-based machines, grub2 needs to be reinstalled as documented in the
    last seen2020-06-01
    modified2020-06-02
    plugin id87397
    published2015-12-16
    reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87397
    titleRHEL 7 : grub2 (RHSA-2015:2623)
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2015-2623.NASL
    descriptionFrom Red Hat Security Advisory 2015:2623 : Updated grub2 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. [Updated 27 January 2016] This advisory has been updated to document additional steps that need to be performed on BIOS-based systems after installing this update. No changes were made to the packages included in the advisory. The grub2 packages provide version 2 of the Grand Unified Bootloader (GRUB), a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : * When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file. (BZ#1290089) All grub2 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For this update to take effect on BIOS-based machines, grub2 needs to be reinstalled as documented in the
    last seen2020-06-01
    modified2020-06-02
    plugin id87395
    published2015-12-16
    reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87395
    titleOracle Linux 7 : grub2 (ELSA-2015-2623)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2015-CEBE5133E7.NASL
    descriptionFixes CVE-2015-8370. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2016-03-04
    plugin id89415
    published2016-03-04
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/89415
    titleFedora 23 : grub2-2.02-0.25.fc23 (2015-cebe5133e7)
  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2015-2623.NASL
    descriptionUpdated grub2 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. [Updated 27 January 2016] This advisory has been updated to document additional steps that need to be performed on BIOS-based systems after installing this update. No changes were made to the packages included in the advisory. The grub2 packages provide version 2 of the Grand Unified Bootloader (GRUB), a highly configurable and customizable bootloader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices. A flaw was found in the way the grub2 handled backspace characters entered in username and password prompts. An attacker with access to the system console could use this flaw to bypass grub2 password protection and gain administrative access to the system. (CVE-2015-8370) This update also fixes the following bug : * When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a configured boot password was not correctly migrated to the newly introduced user.cfg configuration files. This could possibly prevent system administrators from changing grub2 configuration during system boot even if they provided the correct password. This update corrects the password migration script and the incorrectly generated user.cfg file. (BZ#1290089) All grub2 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For this update to take effect on BIOS-based machines, grub2 needs to be reinstalled as documented in the
    last seen2020-06-01
    modified2020-06-02
    plugin id87422
    published2015-12-17
    reporterThis script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87422
    titleCentOS 7 : grub2 (CESA-2015:2623)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2015-957.NASL
    descriptionThis update for grub2 fixes the following issue : Changes in grub2 : - CVE-2015-8370: Fix for overflow in grub_password_get and grub_user_get functions (bnc#956631)
    last seen2020-06-05
    modified2015-12-29
    plugin id87630
    published2015-12-29
    reporterThis script is Copyright (C) 2015-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/87630
    titleopenSUSE Security Update : grub2 (openSUSE-2015-957)
  • NASL familySolaris Local Security Checks
    NASL idSOLARIS_JAN2016_SRU11_3_4_5_0.NASL
    descriptionThis Solaris system is missing necessary patches to address critical security updates : - Vulnerability in the Solaris component of Oracle Sun Systems Products Suite (subcomponent: Grub2). The supported version that is affected is 11. Difficult to exploit vulnerability requiring logon to Operating System. Successful attack of this vulnerability can result in unauthorized Operating System takeover including arbitrary code execution. (CVE-2015-8370) - Vulnerability in the Solaris component of Oracle Sun Systems Products Suite (subcomponent: Zones). The supported version that is affected is 11. Easily exploitable vulnerability requiring logon to Operating System plus additional, multiple logins to components. Successful attack of this vulnerability can escalate attacker privileges resulting in unauthorized read access to a subset of Solaris accessible data. (CVE-2016-0618)
    last seen2020-06-01
    modified2020-06-02
    plugin id88003
    published2016-01-20
    reporterThis script is Copyright (C) 2016-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/88003
    titleOracle Solaris Critical Patch Update : jan2016_SRU11_3_4_5_0
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2015-90C27B6E91.NASL
    descriptionFixes CVE-2015-8370. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2016-03-04
    plugin id89324
    published2016-03-04
    reporterThis script is Copyright (C) 2016-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/89324
    titleFedora 22 : grub2-2.02-0.18.fc22 (2015-90c27b6e91)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2015-2386-1.NASL
    descriptionThis update for grub2 provides the following fixes : A security issues with a bufferoverflow when reading username and password was fixed (bsc#956631, CVE-2015-8370) Bugs fixed : - Expand list of grub.cfg search path in PV Xen guests for systems installed on btrfs snapshots. (bsc#946148, bsc#952539) - Add grub.xen config searching path on boot partition. (bsc#884828) - Add linux16 and initrd16 to grub.xen. (bsc#884830) Note that Tenable Network Security has extracted the preceding description block directly from the SUSE 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 id87669
    published2015-12-30
    reporterThis script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/87669
    titleSUSE SLED11 / SLES11 Security Update : grub2 (SUSE-SU-2015:2386-1)

Redhat

advisories
bugzilla
id1290089
titleGrub password broken by update from RHEL7.1 to RHEL7.2
oval
OR
  • commentRed Hat Enterprise Linux must be installed
    ovaloval:com.redhat.rhba:tst:20070304026
  • AND
    • commentRed Hat Enterprise Linux 7 is installed
      ovaloval:com.redhat.rhba:tst:20150364027
    • OR
      • AND
        • commentgrub2-efi-modules is earlier than 1:2.02-0.33.el7_2
          ovaloval:com.redhat.rhsa:tst:20152623001
        • commentgrub2-efi-modules is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20152401002
      • AND
        • commentgrub2 is earlier than 1:2.02-0.33.el7_2
          ovaloval:com.redhat.rhsa:tst:20152623003
        • commentgrub2 is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20152401008
      • AND
        • commentgrub2-tools is earlier than 1:2.02-0.33.el7_2
          ovaloval:com.redhat.rhsa:tst:20152623005
        • commentgrub2-tools is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20152401004
      • AND
        • commentgrub2-efi is earlier than 1:2.02-0.33.el7_2
          ovaloval:com.redhat.rhsa:tst:20152623007
        • commentgrub2-efi is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20152401006
rhsa
idRHSA-2015:2623
released2015-12-15
severityModerate
titleRHSA-2015:2623: grub2 security and bug fix update (Moderate)
rpms
  • grub2-1:2.02-0.33.el7_2
  • grub2-debuginfo-1:2.02-0.33.el7_2
  • grub2-efi-1:2.02-0.33.el7_2
  • grub2-efi-modules-1:2.02-0.33.el7_2
  • grub2-tools-1:2.02-0.33.el7_2

The Hacker News

idTHN:960C1B9817E3CB5C4AF1E8867B27BE72
last seen2018-01-27
modified2015-12-17
published2015-12-16
reporterSwati Khandelwal
sourcehttps://thehackernews.com/2015/12/hack-linux-grub-password.html
titleYou can Hack into a Linux Computer just by pressing 'Backspace' 28 times

References