Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : libxml2 vulnerabilities (USN-7302-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7302-1. 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(216780);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/17");

  script_cve_id(
    "CVE-2022-49043",
    "CVE-2024-34459",
    "CVE-2024-56171",
    "CVE-2025-24928",
    "CVE-2025-27113"
  );
  script_xref(name:"IAVA", value:"2024-A-0067-S");
  script_xref(name:"USN", value:"7302-1");
  script_xref(name:"IAVA", value:"2025-A-0123-S");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : libxml2 vulnerabilities (USN-7302-1)");

  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 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 host has packages
installed that are affected by multiple vulnerabilities as referenced in the USN-7302-1 advisory.

    It was discovered that libxml2 incorrectly handled certain memory operations. A remote attacker could use
    this issue to cause libxml2 to crash, resulting in a denial of service, or possibly execute arbitrary
    code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2022-49043)

    It was discovered that the libxml2 xmllint tool incorrectly handled certain memory operations. If a user
    or automated system were tricked into running xmllint on a specially crafted xml file, a remote attacker
    could cause xmllint to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS,
    Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2024-34459)

    It was discovered that libxml2 did not properly manage memory. An attacker could possibly use this issue
    to cause a denial of service or execute arbitrary code. (CVE-2024-56171)

    It was discovered that libxml2 could be made to write out of bounds. An attacker could possibly use this
    issue to cause a denial of service or execute arbitrary code. (CVE-2025-24928)

    It was discovered that libxml2 could be made to dereference invalid memory. An attacker could possibly use
    this issue to cause a denial of service. (CVE-2025-27113)

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-7302-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-56171");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/02/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/02/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/02/25");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  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:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libxml2-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-libxml2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2025 Canonical, Inc. / NASL script (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.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 || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '24.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04 / 20.04 / 22.04 / 24.04 / 24.10', '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 ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '14.04', 'pkgname': 'libxml2', 'pkgver': '2.9.1+dfsg1-3ubuntu4.13+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '14.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.1+dfsg1-3ubuntu4.13+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '14.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.1+dfsg1-3ubuntu4.13+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '14.04', 'pkgname': 'python-libxml2', 'pkgver': '2.9.1+dfsg1-3ubuntu4.13+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '16.04', 'pkgname': 'libxml2', 'pkgver': '2.9.3+dfsg1-1ubuntu0.7+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '16.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.3+dfsg1-1ubuntu0.7+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '16.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.3+dfsg1-1ubuntu0.7+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '16.04', 'pkgname': 'python-libxml2', 'pkgver': '2.9.3+dfsg1-1ubuntu0.7+esm7', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '18.04', 'pkgname': 'libxml2', 'pkgver': '2.9.4+dfsg1-6.1ubuntu1.9+esm2', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '18.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.4+dfsg1-6.1ubuntu1.9+esm2', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '18.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.4+dfsg1-6.1ubuntu1.9+esm2', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '18.04', 'pkgname': 'python-libxml2', 'pkgver': '2.9.4+dfsg1-6.1ubuntu1.9+esm2', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '18.04', 'pkgname': 'python3-libxml2', 'pkgver': '2.9.4+dfsg1-6.1ubuntu1.9+esm2', 'ubuntu_pro': TRUE, 'cves': ['CVE-2022-49043', 'CVE-2024-34459', 'CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '20.04', 'pkgname': 'libxml2', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.9', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '20.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.9', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '20.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.9', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '20.04', 'pkgname': 'python-libxml2', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.9', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '20.04', 'pkgname': 'python3-libxml2', 'pkgver': '2.9.10+dfsg-5ubuntu0.20.04.9', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '22.04', 'pkgname': 'libxml2', 'pkgver': '2.9.13+dfsg-1ubuntu0.6', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '22.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.13+dfsg-1ubuntu0.6', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '22.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.13+dfsg-1ubuntu0.6', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '22.04', 'pkgname': 'python3-libxml2', 'pkgver': '2.9.13+dfsg-1ubuntu0.6', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.04', 'pkgname': 'libxml2', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.04', 'pkgname': 'libxml2-dev', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.04', 'pkgname': 'libxml2-utils', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.04', 'pkgname': 'python3-libxml2', 'pkgver': '2.9.14+dfsg-1.3ubuntu3.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.10', 'pkgname': 'libxml2', 'pkgver': '2.12.7+dfsg-3ubuntu0.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.10', 'pkgname': 'libxml2-dev', 'pkgver': '2.12.7+dfsg-3ubuntu0.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.10', 'pkgname': 'libxml2-utils', 'pkgver': '2.12.7+dfsg-3ubuntu0.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']},
    {'osver': '24.10', 'pkgname': 'python3-libxml2', 'pkgver': '2.12.7+dfsg-3ubuntu0.2', 'ubuntu_pro': FALSE, 'cves': ['CVE-2024-56171', 'CVE-2025-24928', 'CVE-2025-27113']}
];

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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    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, 'libxml2 / libxml2-dev / libxml2-utils / python-libxml2 / etc');
}