Ubuntu 14.04 LTS / 16.04 LTS : X.Org X server vulnerabilities (USN-3453-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3453-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(103834);
  script_version("3.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id("CVE-2017-13721", "CVE-2017-13723");
  script_xref(name:"USN", value:"3453-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : X.Org X server vulnerabilities (USN-3453-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Michal Srb discovered that the X.Org X server incorrectly handled
shared memory segments. An attacker able to connect to an X server,
either locally or remotely, could use this issue to crash the server,
or possibly replace shared memory segments of other X clients in the
same session. (CVE-2017-13721)

Michal Srb discovered that the X.Org X server incorrectly handled XKB
buffers. An attacker able to connect to an X server, either locally or
remotely, could use this issue to crash the server, or possibly
execute arbitrary code. (CVE-2017-13723).

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.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-3453-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/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:"cvss_score_source", value:"CVE-2017-13723");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/10/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/10/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core-lts-xenial");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-core-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-dev-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-dev-lts-xenial");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-legacy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-legacy-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xorg-xmir");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xvfb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xwayland");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xwayland-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xwayland-lts-xenial");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xdmx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xdmx-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xmir");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xmir-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xnest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xorg-server-source");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xorg-server-source-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xorg-server-source-lts-xenial");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xephyr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xephyr-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xserver-xephyr-lts-xenial");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2017-2023 Canonical, Inc. / NASL script (C) 2017-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release || '16.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '14.04', 'pkgname': 'xdmx', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xdmx-tools', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xnest', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xorg-server-source', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xorg-server-source-lts-xenial', 'pkgver': '2:1.18.3-1ubuntu2.3~trusty3'},
    {'osver': '14.04', 'pkgname': 'xserver-common', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xserver-xephyr', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xserver-xephyr-lts-xenial', 'pkgver': '2:1.18.3-1ubuntu2.3~trusty3'},
    {'osver': '14.04', 'pkgname': 'xserver-xorg-core', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xserver-xorg-core-lts-xenial', 'pkgver': '2:1.18.3-1ubuntu2.3~trusty3'},
    {'osver': '14.04', 'pkgname': 'xserver-xorg-core-udeb', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xserver-xorg-dev', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xserver-xorg-dev-lts-xenial', 'pkgver': '2:1.18.3-1ubuntu2.3~trusty3'},
    {'osver': '14.04', 'pkgname': 'xserver-xorg-xmir', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xvfb', 'pkgver': '2:1.15.1-0ubuntu2.10'},
    {'osver': '14.04', 'pkgname': 'xwayland-lts-xenial', 'pkgver': '2:1.18.3-1ubuntu2.3~trusty3'},
    {'osver': '16.04', 'pkgname': 'xdmx', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xdmx-tools', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xmir', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xmir-hwe-16.04', 'pkgver': '2:1.19.3-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'xnest', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xorg-server-source', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xorg-server-source-hwe-16.04', 'pkgver': '2:1.19.3-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'xserver-common', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xserver-xephyr', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xserver-xephyr-hwe-16.04', 'pkgver': '2:1.19.3-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-core', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-core-hwe-16.04', 'pkgver': '2:1.19.3-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-core-udeb', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-dev', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-dev-hwe-16.04', 'pkgver': '2:1.19.3-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-legacy', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-legacy-hwe-16.04', 'pkgver': '2:1.19.3-1ubuntu1~16.04.3'},
    {'osver': '16.04', 'pkgname': 'xserver-xorg-xmir', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xvfb', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xwayland', 'pkgver': '2:1.18.4-0ubuntu0.6'},
    {'osver': '16.04', 'pkgname': 'xwayland-hwe-16.04', 'pkgver': '2:1.19.3-1ubuntu1~16.04.3'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'xdmx / xdmx-tools / xmir / xmir-hwe-16.04 / xnest / etc');
}