Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : polkit vulnerabilities (USN-8173-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8173-1. 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(306544);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/15");

  script_cve_id("CVE-2025-7519", "CVE-2026-4897");
  script_xref(name:"USN", value:"8173-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : polkit vulnerabilities (USN-8173-1)");

  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 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8173-1 advisory.

    It was discovered that polkit incorrectly handled nested elements in XML policy files. If an administrator
    were tricked into installing a malicious policy file, a remote attacker could possibly use this issue to
    cause polkit to crash, resulting in a denial of service. (CVE-2025-7519)

    Pavel Kohout discovered that the polkit polkit-agent-helper-1 utility incorrectly handled long input. A
    local attacker could possibly use this issue to cause polkit to crash, resulting in a denial of service.
    (CVE-2026-4897)

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-8173-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/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:H/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-2026-4897");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2025-7519");

  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:"2025/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:25.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gir1.2-polkit-1.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-agent-1-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-agent-1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-gobject-1-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpolkit-gobject-1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:pkexec");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:policykit-1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:polkitd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:polkitd-pkla");
  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) 2026 Canonical, Inc. / NASL script (C) 2026 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 (! ('22.04' >< os_release || '24.04' >< os_release || '25.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10', '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': '22.04', 'pkgname': 'gir1.2-polkit-1.0', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'libpolkit-agent-1-0', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'libpolkit-agent-1-dev', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'libpolkit-gobject-1-0', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'libpolkit-gobject-1-dev', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'pkexec', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'policykit-1', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '22.04', 'pkgname': 'polkitd', 'pkgver': '0.105-33ubuntu0.1'},
    {'osver': '24.04', 'pkgname': 'gir1.2-polkit-1.0', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libpolkit-agent-1-0', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libpolkit-agent-1-dev', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libpolkit-gobject-1-0', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libpolkit-gobject-1-dev', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'pkexec', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'policykit-1', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'polkitd', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '24.04', 'pkgname': 'polkitd-pkla', 'pkgver': '124-2ubuntu1.24.04.3'},
    {'osver': '25.10', 'pkgname': 'gir1.2-polkit-1.0', 'pkgver': '126-2ubuntu0.1'},
    {'osver': '25.10', 'pkgname': 'libpolkit-agent-1-0', 'pkgver': '126-2ubuntu0.1'},
    {'osver': '25.10', 'pkgname': 'libpolkit-agent-1-dev', 'pkgver': '126-2ubuntu0.1'},
    {'osver': '25.10', 'pkgname': 'libpolkit-gobject-1-0', 'pkgver': '126-2ubuntu0.1'},
    {'osver': '25.10', 'pkgname': 'libpolkit-gobject-1-dev', 'pkgver': '126-2ubuntu0.1'},
    {'osver': '25.10', 'pkgname': 'pkexec', 'pkgver': '126-2ubuntu0.1'},
    {'osver': '25.10', 'pkgname': 'polkitd', 'pkgver': '126-2ubuntu0.1'}
];

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'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) 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, 'gir1.2-polkit-1.0 / libpolkit-agent-1-0 / libpolkit-agent-1-dev / etc');
}