Vulnerabilities > CVE-2017-7394 - Improper Input Validation vulnerability in Tigervnc 1.7.1

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
tigervnc
CWE-20
nessus
NVD
Published: 2017-04-01
Updated: 2018-01-13

Summary

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Vulnerable Configurations

Part Description Count
Application
Tigervnc
1

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 familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201801-13.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201801-13 (TigerVNC: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in TigerVNC. Please review the referenced CVE Identifiers for details. Impact : An attacker could execute arbitrary code or cause a Denial of Service condition. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id105757
    published2018-01-12
    reporterThis script is Copyright (C) 2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/105757
    titleGLSA-201801-13 : TigerVNC: Multiple vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201801-13.
#
# The advisory text is Copyright (C) 2001-2018 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(105757);
  script_version("$Revision: 3.2 $");
  script_cvs_date("$Date: 2018/01/26 17:15:58 $");

  script_cve_id("CVE-2016-10207", "CVE-2017-7392", "CVE-2017-7393", "CVE-2017-7394", "CVE-2017-7395", "CVE-2017-7396");
  script_xref(name:"GLSA", value:"201801-13");

  script_name(english:"GLSA-201801-13 : TigerVNC: Multiple vulnerabilities");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-201801-13
(TigerVNC: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in TigerVNC. Please review
      the referenced CVE Identifiers for details.
  
Impact :

    An attacker could execute arbitrary code or cause a Denial of Service
      condition.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201801-13"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All TigerVNC users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=net-misc/tigervnc-1.8.0'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:tigervnc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/01/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/12");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

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

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"net-misc/tigervnc", unaffected:make_list("ge 1.8.0"), vulnerable:make_list("lt 1.8.0"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "TigerVNC");
}
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2017-1094-1.NASL
    descriptionThis update for tigervnc provides the several fixes. These security issues were fixed : - CVE-2017-7392, CVE-2017-7396: Client can cause leak in VNC server (bsc#1031886) - CVE-2017-7395: Authenticated VNC client can crash VNC server (bsc#1031877) - CVE-2017-7394: Client can crash or block VNC server (bsc#1031879) - CVE-2017-7393: Authenticated client can cause double free in VNC server (bsc#1031875) - Prevent buffer overflow in VNC client, allowing for crashing the client (bnc#1032880) The update package also includes non-security fixes. See advisory for details. 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 id99625
    published2017-04-24
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/99625
    titleSUSE SLED12 / SLES12 Security Update : tigervnc (SUSE-SU-2017:1094-1)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2017:1094-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(99625);
  script_version("3.9");
  script_cvs_date("Date: 2019/09/11 11:22:15");

  script_cve_id("CVE-2017-7392", "CVE-2017-7393", "CVE-2017-7394", "CVE-2017-7395", "CVE-2017-7396");

  script_name(english:"SUSE SLED12 / SLES12 Security Update : tigervnc (SUSE-SU-2017:1094-1)");
  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 tigervnc provides the several fixes. These security
issues were fixed :

  - CVE-2017-7392, CVE-2017-7396: Client can cause leak in
    VNC server (bsc#1031886)

  - CVE-2017-7395: Authenticated VNC client can crash VNC
    server (bsc#1031877)

  - CVE-2017-7394: Client can crash or block VNC server
    (bsc#1031879)

  - CVE-2017-7393: Authenticated client can cause double
    free in VNC server (bsc#1031875)

  - Prevent buffer overflow in VNC client, allowing for
    crashing the client (bnc#1032880)

The update package also includes non-security fixes. See advisory for
details.

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=1024929"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1026833"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1031045"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1031875"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1031877"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1031879"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1031886"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1032272"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1032880"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-7392/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-7393/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-7394/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-7395/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-7396/"
  );
  # https://www.suse.com/support/update/announcement/2017/suse-su-20171094-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?239ae702"
  );
  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 for Raspberry Pi 12-SP2:zypper in -t
patch SUSE-SLE-RPI-12-SP2-2017-635=1

SUSE Linux Enterprise Server 12-SP2:zypper in -t patch
SUSE-SLE-SERVER-12-SP2-2017-635=1

SUSE Linux Enterprise Desktop 12-SP2:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP2-2017-635=1

To bring your system up-to-date, use 'zypper patch'."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/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:L/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:"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:libXvnc1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libXvnc1-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:tigervnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:tigervnc-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:tigervnc-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xorg-x11-Xvnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xorg-x11-Xvnc-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/04/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/04/24");
  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:"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:"^(SLED12|SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED12 / SLES12", "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 == "SLES12" && (! preg(pattern:"^(2)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP2", os_ver + " SP" + sp);
if (os_ver == "SLED12" && (! preg(pattern:"^(2)$", string:sp))) audit(AUDIT_OS_NOT, "SLED12 SP2", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"libXvnc1-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"libXvnc1-debuginfo-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"tigervnc-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"tigervnc-debuginfo-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"tigervnc-debugsource-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"xorg-x11-Xvnc-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"xorg-x11-Xvnc-debuginfo-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"libXvnc1-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"libXvnc1-debuginfo-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"tigervnc-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"tigervnc-debuginfo-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"tigervnc-debugsource-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"xorg-x11-Xvnc-1.6.0-18.11.1")) flag++;
if (rpm_check(release:"SLED12", sp:"2", cpu:"x86_64", reference:"xorg-x11-Xvnc-debuginfo-1.6.0-18.11.1")) 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, "tigervnc");
}
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2017-1228.NASL
    descriptionAccording to the versions of the tigervnc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A denial of service flaw was found in the TigerVNC
    last seen2020-05-06
    modified2017-09-11
    plugin id103086
    published2017-09-11
    reporterThis script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103086
    titleEulerOS 2.0 SP2 : tigervnc (EulerOS-SA-2017-1228)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(103086);
  script_version("3.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/04");

  script_cve_id(
    "CVE-2016-10207",
    "CVE-2017-5581",
    "CVE-2017-7392",
    "CVE-2017-7393",
    "CVE-2017-7394",
    "CVE-2017-7395",
    "CVE-2017-7396"
  );

  script_name(english:"EulerOS 2.0 SP2 : tigervnc (EulerOS-SA-2017-1228)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the tigervnc packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - A denial of service flaw was found in the TigerVNC's
    Xvnc server. A remote unauthenticated attacker could
    use this flaw to make Xvnc crash by terminating the TLS
    handshake process early. (CVE-2016-10207)

  - A double free flaw was found in the way TigerVNC
    handled ClientFence messages. A remote, authenticated
    attacker could use this flaw to make Xvnc crash by
    sending specially crafted ClientFence messages,
    resulting in denial of service. (CVE-2017-7393)

  - A missing input sanitization flaw was found in the way
    TigerVNC handled credentials. A remote unauthenticated
    attacker could use this flaw to make Xvnc crash by
    sending specially crafted usernames, resulting in
    denial of service. (CVE-2017-7394)

  - An integer overflow flaw was found in the way TigerVNC
    handled ClientCutText messages. A remote, authenticated
    attacker could use this flaw to make Xvnc crash by
    sending specially crafted ClientCutText messages,
    resulting in denial of service. (CVE-2017-7395)

  - A buffer overflow flaw, leading to memory corruption,
    was found in TigerVNC viewer. A remote malicious VNC
    server could use this flaw to crash the client
    vncviewer process resulting in denial of service.
    (CVE-2017-5581)

  - A memory leak flaw was found in the way TigerVNC
    handled termination of VeNCrypt connections. A remote
    unauthenticated attacker could repeatedly send
    connection requests to the Xvnc server, causing it to
    consume large amounts of memory resources over time,
    and ultimately leading to a denial of service due to
    memory exhaustion. (CVE-2017-7392)

  - A memory leak flaw was found in the way TigerVNC
    handled client connections. A remote unauthenticated
    attacker could repeatedly send connection requests to
    the Xvnc server, causing it to consume large amounts of
    memory resources over time, and ultimately leading to a
    denial of service due to memory exhaustion.
    (CVE-2017-7396)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2017-1228
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?852c57ec");
  script_set_attribute(attribute:"solution", value:
"Update the affected tigervnc packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/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:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-icons");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-server-minimal");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  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/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(2)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP2");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP2", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["tigervnc-1.8.0-1",
        "tigervnc-icons-1.8.0-1",
        "tigervnc-license-1.8.0-1",
        "tigervnc-server-1.8.0-1",
        "tigervnc-server-minimal-1.8.0-1"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"2", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, "tigervnc");
}
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2017-A66CA10C22.NASL
    descriptionSecurity fix for CVE-2017-7392 CVE-2017-7393 CVE-2017-7394 CVE-2017-7395 CVE-2017-7396. Add systemd unit file for Xvnc. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2017-04-26
    plugin id99681
    published2017-04-26
    reporterThis script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/99681
    titleFedora 24 : tigervnc (2017-a66ca10c22)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory FEDORA-2017-a66ca10c22.
#

include("compat.inc");

if (description)
{
  script_id(99681);
  script_version("3.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2017-7392", "CVE-2017-7393", "CVE-2017-7394", "CVE-2017-7395", "CVE-2017-7396");
  script_xref(name:"FEDORA", value:"2017-a66ca10c22");

  script_name(english:"Fedora 24 : tigervnc (2017-a66ca10c22)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Security fix for CVE-2017-7392 CVE-2017-7393 CVE-2017-7394
CVE-2017-7395 CVE-2017-7396.

Add systemd unit file for Xvnc.

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
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://bodhi.fedoraproject.org/updates/FEDORA-2017-a66ca10c22"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected tigervnc package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:tigervnc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:24");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/04/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/04/26");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^24([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 24", "Fedora " + 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);


flag = 0;
if (rpm_check(release:"FC24", reference:"tigervnc-1.7.1-4.fc24")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, "tigervnc");
}
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2017-475.NASL
    descriptionThis update for tigervnc provides the several fixes. These security issues were fixed : - CVE-2017-7392, CVE-2017-7396: Client can cause leak in VNC server (bsc#1031886) - CVE-2017-7395: Authenticated VNC client can crash VNC server (bsc#1031877) - CVE-2017-7394: Client can crash or block VNC server (bsc#1031879) - CVE-2017-7393: Authenticated client can cause double free in VNC server (bsc#1031875) - Prevent buffer overflow in VNC client, allowing for crashing the client (bnc#1032880)
    last seen2020-06-05
    modified2017-04-18
    plugin id99426
    published2017-04-18
    reporterThis script is Copyright (C) 2017-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/99426
    titleopenSUSE Security Update : tigervnc (openSUSE-2017-475)
  • NASL familyAmazon Linux Local Security Checks
    NASL idALA_ALAS-2017-879.NASL
    descriptionBuffer overflow in ModifiablePixelBuffer::fillRect A buffer overflow flaw, leading to memory corruption, was found in TigerVNC viewer. A remote malicious VNC server could use this flaw to crash the client vncviewer process resulting in denial of service. (CVE-2017-5581) VNC server can crash when TLS handshake terminates early : A denial of service flaw was found in the TigerVNC
    last seen2020-06-01
    modified2020-06-02
    plugin id102867
    published2017-09-01
    reporterThis script is Copyright (C) 2017-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/102867
    titleAmazon Linux AMI : tigervnc (ALAS-2017-879)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2017-1093-1.NASL
    descriptionThis update for tigervnc provides the several fixes. These security issues were fixed : - CVE-2017-7392, CVE-2017-7396: Client can cause leak in VNC server (bsc#1031886) - CVE-2017-7395: Authenticated VNC client can crash VNC server (bsc#1031877) - CVE-2017-7394: Client can crash or block VNC server (bsc#1031879) - CVE-2017-7393: Authenticated client can cause double free in VNC server (bsc#1031875) - Prevent buffer overflow in VNC client, allowing for crashing the client (bnc#1032880) 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 id99624
    published2017-04-24
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/99624
    titleSUSE SLED12 / SLES12 Security Update : tigervnc (SUSE-SU-2017:1093-1)
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2017-2000.NASL
    descriptionFrom Red Hat Security Advisory 2017:2000 : An update for tigervnc and fltk is now available for 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. Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients which allows users to connect to other desktops running a VNC server. FLTK (pronounced
    last seen2020-06-01
    modified2020-06-02
    plugin id102293
    published2017-08-09
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102293
    titleOracle Linux 7 : fltk / tigervnc (ELSA-2017-2000)
  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2017-2000.NASL
    descriptionAn update for tigervnc and fltk is now available for 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. Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients which allows users to connect to other desktops running a VNC server. FLTK (pronounced
    last seen2020-06-01
    modified2020-06-02
    plugin id102748
    published2017-08-25
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102748
    titleCentOS 7 : fltk / tigervnc (CESA-2017:2000)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2017-2D0066D567.NASL
    descriptionSecurity fix for CVE-2017-7392 CVE-2017-7393 CVE-2017-7394 CVE-2017-7395 CVE-2017-7396. Add systemd unit file for Xvnc. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2017-07-17
    plugin id101597
    published2017-07-17
    reporterThis script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/101597
    titleFedora 26 : tigervnc (2017-2d0066d567)
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20170801_TIGERVNC_AND_FLTK_ON_SL7_X.NASL
    descriptionFLTK (pronounced
    last seen2020-03-18
    modified2017-08-22
    plugin id102658
    published2017-08-22
    reporterThis script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102658
    titleScientific Linux Security Update : tigervnc and fltk on SL7.x x86_64 (20170801)
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2017-51979161F4.NASL
    descriptionSecurity fix for CVE-2017-7392 CVE-2017-7393 CVE-2017-7394 CVE-2017-7395 CVE-2017-7396. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-05
    modified2017-04-07
    plugin id99239
    published2017-04-07
    reporterThis script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/99239
    titleFedora 25 : tigervnc (2017-51979161f4)
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2017-2000.NASL
    descriptionAn update for tigervnc and fltk is now available for 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. Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients which allows users to connect to other desktops running a VNC server. FLTK (pronounced
    last seen2020-06-01
    modified2020-06-02
    plugin id102109
    published2017-08-02
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102109
    titleRHEL 7 : tigervnc and fltk (RHSA-2017:2000)
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2017-1227.NASL
    descriptionAccording to the versions of the tigervnc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A denial of service flaw was found in the TigerVNC
    last seen2020-05-06
    modified2017-09-11
    plugin id103085
    published2017-09-11
    reporterThis script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103085
    titleEulerOS 2.0 SP1 : tigervnc (EulerOS-SA-2017-1227)

Redhat

advisories
rhsa
idRHSA-2017:2000
rpms
  • fltk-0:1.3.4-1.el7
  • fltk-debuginfo-0:1.3.4-1.el7
  • fltk-devel-0:1.3.4-1.el7
  • fltk-fluid-0:1.3.4-1.el7
  • fltk-static-0:1.3.4-1.el7
  • tigervnc-0:1.8.0-1.el7
  • tigervnc-debuginfo-0:1.8.0-1.el7
  • tigervnc-icons-0:1.8.0-1.el7
  • tigervnc-license-0:1.8.0-1.el7
  • tigervnc-server-0:1.8.0-1.el7
  • tigervnc-server-applet-0:1.8.0-1.el7
  • tigervnc-server-minimal-0:1.8.0-1.el7
  • tigervnc-server-module-0:1.8.0-1.el7

References