Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : libx11 vulnerabilities (USN-6407-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6407-1. 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(182471);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id("CVE-2023-43785", "CVE-2023-43786", "CVE-2023-43787");
  script_xref(name:"USN", value:"6407-1");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : libx11 vulnerabilities (USN-6407-1)");

  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 / 23.04 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6407-1 advisory.

    Gregory James Duck discovered that libx11 incorrectly handled certain keyboard symbols. If a user were
    tricked into connecting to a malicious X server, a remote attacker could use this issue to cause libx11 to
    crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-43785)

    Yair Mizrahi discovered that libx11 incorrectly handled certain malformed XPM image files. If a user were
    tricked into opening a specially crafted XPM image file, a remote attacker could possibly use this issue
    to consume memory, leading to a denial of service. (CVE-2023-43786)

    Yair Mizrahi discovered that libx11 incorrectly handled certain malformed XPM image files. If a user were
    tricked into opening a specially crafted XPM image file, a remote attacker could use this issue to cause
    libx11 to crash, leading to a denial of service, or possibly execute arbitrary code. (CVE-2023-43787)

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

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-6407-1");
  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-2023-43787");

  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:"2023/10/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/03");

  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:"p-cpe:/a:canonical:ubuntu_linux:libx11-6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx11-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx11-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx11-xcb-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libx11-xcb1");
  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) 2023-2024 Canonical, Inc. / NASL script (C) 2023-2024 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)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.04', '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': '20.04', 'pkgname': 'libx11-6', 'pkgver': '2:1.6.9-2ubuntu1.6'},
    {'osver': '20.04', 'pkgname': 'libx11-data', 'pkgver': '2:1.6.9-2ubuntu1.6'},
    {'osver': '20.04', 'pkgname': 'libx11-dev', 'pkgver': '2:1.6.9-2ubuntu1.6'},
    {'osver': '20.04', 'pkgname': 'libx11-xcb-dev', 'pkgver': '2:1.6.9-2ubuntu1.6'},
    {'osver': '20.04', 'pkgname': 'libx11-xcb1', 'pkgver': '2:1.6.9-2ubuntu1.6'},
    {'osver': '22.04', 'pkgname': 'libx11-6', 'pkgver': '2:1.7.5-1ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libx11-data', 'pkgver': '2:1.7.5-1ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libx11-dev', 'pkgver': '2:1.7.5-1ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libx11-xcb-dev', 'pkgver': '2:1.7.5-1ubuntu0.3'},
    {'osver': '22.04', 'pkgname': 'libx11-xcb1', 'pkgver': '2:1.7.5-1ubuntu0.3'},
    {'osver': '23.04', 'pkgname': 'libx11-6', 'pkgver': '2:1.8.4-2ubuntu0.3'},
    {'osver': '23.04', 'pkgname': 'libx11-data', 'pkgver': '2:1.8.4-2ubuntu0.3'},
    {'osver': '23.04', 'pkgname': 'libx11-dev', 'pkgver': '2:1.8.4-2ubuntu0.3'},
    {'osver': '23.04', 'pkgname': 'libx11-xcb-dev', 'pkgver': '2:1.8.4-2ubuntu0.3'},
    {'osver': '23.04', 'pkgname': 'libx11-xcb1', 'pkgver': '2:1.8.4-2ubuntu0.3'}
];

var flag = 0;
foreach var 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)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libx11-6 / libx11-data / libx11-dev / libx11-xcb-dev / libx11-xcb1');
}