Debian DSA-5380-1 : xorg-server - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-5380. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(173649);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/01/24");

  script_cve_id("CVE-2023-1393");

  script_name(english:"Debian DSA-5380-1 : xorg-server - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dsa-5380
advisory.

    Jan-Niklas Sohn discovered that a user-after-free flaw in the Composite extension of the X.org X server
    may result in privilege escalation if the X server is running under the root user. For the stable
    distribution (bullseye), this problem has been fixed in version 2:1.20.11-1+deb11u6. We recommend that you
    upgrade your xorg-server packages. For the detailed security status of xorg-server please refer to its
    security tracker page at: https://security-tracker.debian.org/tracker/xorg-server

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/xorg-server");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2023/dsa-5380");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-1393");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/xorg-server");
  script_set_attribute(attribute:"solution", value:
"Upgrade the xorg-server packages.

For the stable distribution (bullseye), this problem has been fixed in version 2");
  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-2023-1393");

  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:"2023/03/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/03/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/03/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xdmx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xdmx-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xnest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xorg-server-source");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xephyr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-core-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xserver-xorg-legacy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xvfb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xwayland");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023-2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var 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, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'xdmx', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xdmx-tools', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xnest', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xorg-server-source', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xserver-common', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xserver-xephyr', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xserver-xorg-core', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xserver-xorg-core-udeb', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xserver-xorg-dev', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xserver-xorg-legacy', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xvfb', 'reference': '2:1.20.11-1+deb11u6'},
    {'release': '11.0', 'prefix': 'xwayland', 'reference': '2:1.20.11-1+deb11u6'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_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');
}