Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : CUPS vulnerability (USN-7912-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7912-1. 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(277582);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/05");

  script_cve_id("CVE-2025-58436");
  script_xref(name:"USN", value:"7912-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : CUPS vulnerability (USN-7912-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 host has packages installed that are affected by a vulnerability
as referenced in the USN-7912-1 advisory.

    Johannes Meixner and Paul Zirnik discovered that CUPS incorrectly handled clients that send messages
    slowly. A remote attacker could possibly use this issue to cause CUPS to stop responding, resulting in a
    denial of service. (CVE-2025-58436)

    In addition, this update fixes a regression introduced in USN-7897-1 which resulted in certain invalid
    configuration file directives to cause the CUPS daemon to fail to start.

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-7912-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-2025-58436");

  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:"2025/11/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/05");

  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:25.04");
  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:cups");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-bsd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-core-drivers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-daemon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-ipp-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-ppdc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:cups-server-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcups2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcups2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcups2t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsimage2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsimage2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcupsimage2t64");
  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) 2025 Canonical, Inc. / NASL script (C) 2025 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 || '25.04' >< os_release || '25.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.04 / 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': 'cups', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-bsd', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-client', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-common', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-core-drivers', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-daemon', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-ipp-utils', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-ppdc', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'cups-server-common', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'libcups2', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'libcups2-dev', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'libcupsimage2', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '22.04', 'pkgname': 'libcupsimage2-dev', 'pkgver': '2.4.1op1-1ubuntu4.16'},
    {'osver': '24.04', 'pkgname': 'cups', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-bsd', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-client', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-common', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-core-drivers', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-daemon', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-ipp-utils', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-ppdc', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'cups-server-common', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'libcups2-dev', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'libcups2t64', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'libcupsimage2-dev', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '24.04', 'pkgname': 'libcupsimage2t64', 'pkgver': '2.4.7-1.2ubuntu7.9'},
    {'osver': '25.04', 'pkgname': 'cups', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-bsd', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-client', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-common', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-core-drivers', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-daemon', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-ipp-utils', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-ppdc', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'cups-server-common', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'libcups2-dev', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'libcups2t64', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'libcupsimage2-dev', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.04', 'pkgname': 'libcupsimage2t64', 'pkgver': '2.4.12-0ubuntu1.6'},
    {'osver': '25.10', 'pkgname': 'cups', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-bsd', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-client', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-common', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-core-drivers', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-daemon', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-ipp-utils', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-ppdc', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'cups-server-common', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'libcups2-dev', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'libcups2t64', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'libcupsimage2-dev', 'pkgver': '2.4.12-0ubuntu3.5'},
    {'osver': '25.10', 'pkgname': 'libcupsimage2t64', 'pkgver': '2.4.12-0ubuntu3.5'}
];

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, 'cups / cups-bsd / cups-client / cups-common / cups-core-drivers / etc');
}