Ubuntu 20.04 LTS / 22.04 LTS / 23.04 / 23.10 : X.Org X Server vulnerabilities (USN-6453-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6453-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(183886);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/03");

  script_cve_id("CVE-2023-5367", "CVE-2023-5380");
  script_xref(name:"USN", value:"6453-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.04 / 23.10 : X.Org X Server vulnerabilities (USN-6453-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 20.04 LTS / 22.04 LTS / 23.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6453-1 advisory.

  - The X.Org project reports: When prepending values to an existing property an             invalid offset
    calculation causes the existing values to             be appended at the wrong offset. The resulting
    memcpy()             would write into memory outside the heap-allocated             array. This
    vulnerability requires a legacy multi-screen setup             with multiple protocol screens (Zaphod).
    If the pointer             is warped from one screen to the root window of the other             screen,
    the enter/leave code may retain a reference to the             previous pointer window. Destroying this
    window leaves             that reference in place, other windows may then trigger a             use-after-
    free bug when they are destroyed.  (CVE-2023-5367, CVE-2023-5380)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-6453-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/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: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-2023-5367");

  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:"2023/10/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.10");
  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: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: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-xorg-core");
  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-legacy");
  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:"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) 2023 Canonical, Inc. / NASL script (C) 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 (! ('20.04' >< os_release || '22.04' >< os_release || '23.04' >< os_release || '23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.04 / 23.10', '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': '20.04', 'pkgname': 'xdmx', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xdmx-tools', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xnest', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xorg-server-source', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xserver-common', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xserver-xephyr', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xserver-xorg-core', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xserver-xorg-dev', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xserver-xorg-legacy', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xvfb', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '20.04', 'pkgname': 'xwayland', 'pkgver': '2:1.20.13-1ubuntu1~20.04.9'},
    {'osver': '22.04', 'pkgname': 'xnest', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xorg-server-source', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xserver-common', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xserver-xephyr', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xserver-xorg-core', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xserver-xorg-dev', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xserver-xorg-legacy', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xvfb', 'pkgver': '2:21.1.4-2ubuntu1.7~22.04.2'},
    {'osver': '22.04', 'pkgname': 'xwayland', 'pkgver': '2:22.1.1-1ubuntu0.7'},
    {'osver': '23.04', 'pkgname': 'xnest', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xorg-server-source', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xserver-common', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xserver-xephyr', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xserver-xorg-core', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xserver-xorg-dev', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xserver-xorg-legacy', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xvfb', 'pkgver': '2:21.1.7-1ubuntu3.1'},
    {'osver': '23.04', 'pkgname': 'xwayland', 'pkgver': '2:22.1.8-1ubuntu1.1'},
    {'osver': '23.10', 'pkgname': 'xnest', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xorg-server-source', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xserver-common', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xserver-xephyr', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xserver-xorg-core', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xserver-xorg-dev', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xserver-xorg-legacy', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xvfb', 'pkgver': '2:21.1.7-3ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'xwayland', 'pkgver': '2:23.2.0-1ubuntu0.1'}
];

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 / xnest / xorg-server-source / xserver-common / etc');
}