Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS : Perl vulnerabilities (USN-8675-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8675-1. 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(365408);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/13");

  script_cve_id(
    "CVE-2026-12087",
    "CVE-2026-13221",
    "CVE-2026-57432",
    "CVE-2026-57433"
  );
  script_xref(name:"IAVA", value:"2026-A-0618");
  script_xref(name:"IAVA", value:"2026-A-0696-S");
  script_xref(name:"USN", value:"8675-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS : Perl vulnerabilities (USN-8675-1)");

  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 host has packages installed that are
affected by multiple vulnerabilities as referenced in the USN-8675-1 advisory.

    It was discovered that Perl incorrectly handled short source addresses in the Socket module. An attacker
    could possibly use this issue to trigger an out-of-bounds heap read, resulting in information disclosure.
    (CVE-2026-12087)

    It was discovered that Perl incorrectly handled regular expressions containing a large number of fixed
    string alternatives. An attacker could possibly use this issue to cause incorrect regular expression
    matches, resulting in security restrictions being bypassed. (CVE-2026-13221)

    It was discovered that Perl incorrectly handled certain large repeat counts when processing pack and
    unpack templates. An attacker could possibly use this issue to trigger an out-of-bounds heap read,
    resulting in information disclosure. (CVE-2026-57432)

    It was discovered that Perl incorrectly handled certain crafted data when deserializing with the Storable
    module. An attacker could possibly use this issue to trigger an integer overflow and application
    termination, resulting in a denial of service. (CVE-2026-57433)

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-8675-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/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-2026-13221");

  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:"2026/06/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/13");

  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:"p-cpe:/a:canonical:ubuntu_linux:libcgi-fast-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libperl5.18");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libperl5.22");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libperl5.26");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libperl5.30");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libperl5.34");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.22");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.26");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.30");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.34");
  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) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.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)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04 / 20.04 / 22.04', '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': '14.04', 'pkgname': 'libcgi-fast-perl', 'pkgver': '5.18.2-2ubuntu1.7+esm8'},
    {'osver': '14.04', 'pkgname': 'libperl5.18', 'pkgver': '5.18.2-2ubuntu1.7+esm8'},
    {'osver': '14.04', 'pkgname': 'perl', 'pkgver': '5.18.2-2ubuntu1.7+esm8'},
    {'osver': '14.04', 'pkgname': 'perl-base', 'pkgver': '5.18.2-2ubuntu1.7+esm8'},
    {'osver': '14.04', 'pkgname': 'perl-debug', 'pkgver': '5.18.2-2ubuntu1.7+esm8'},
    {'osver': '14.04', 'pkgname': 'perl-modules', 'pkgver': '5.18.2-2ubuntu1.7+esm8'},
    {'osver': '16.04', 'pkgname': 'libperl5.22', 'pkgver': '5.22.1-9ubuntu0.9+esm3'},
    {'osver': '16.04', 'pkgname': 'perl', 'pkgver': '5.22.1-9ubuntu0.9+esm3'},
    {'osver': '16.04', 'pkgname': 'perl-base', 'pkgver': '5.22.1-9ubuntu0.9+esm3'},
    {'osver': '16.04', 'pkgname': 'perl-debug', 'pkgver': '5.22.1-9ubuntu0.9+esm3'},
    {'osver': '16.04', 'pkgname': 'perl-modules-5.22', 'pkgver': '5.22.1-9ubuntu0.9+esm3'},
    {'osver': '18.04', 'pkgname': 'libperl5.26', 'pkgver': '5.26.1-6ubuntu0.7+esm3'},
    {'osver': '18.04', 'pkgname': 'perl', 'pkgver': '5.26.1-6ubuntu0.7+esm3'},
    {'osver': '18.04', 'pkgname': 'perl-base', 'pkgver': '5.26.1-6ubuntu0.7+esm3'},
    {'osver': '18.04', 'pkgname': 'perl-debug', 'pkgver': '5.26.1-6ubuntu0.7+esm3'},
    {'osver': '18.04', 'pkgname': 'perl-modules-5.26', 'pkgver': '5.26.1-6ubuntu0.7+esm3'},
    {'osver': '20.04', 'pkgname': 'libperl5.30', 'pkgver': '5.30.0-9ubuntu0.5+esm3'},
    {'osver': '20.04', 'pkgname': 'perl', 'pkgver': '5.30.0-9ubuntu0.5+esm3'},
    {'osver': '20.04', 'pkgname': 'perl-base', 'pkgver': '5.30.0-9ubuntu0.5+esm3'},
    {'osver': '20.04', 'pkgname': 'perl-debug', 'pkgver': '5.30.0-9ubuntu0.5+esm3'},
    {'osver': '20.04', 'pkgname': 'perl-modules-5.30', 'pkgver': '5.30.0-9ubuntu0.5+esm3'},
    {'osver': '22.04', 'pkgname': 'libperl5.34', 'pkgver': '5.34.0-3ubuntu1.8'},
    {'osver': '22.04', 'pkgname': 'perl', 'pkgver': '5.34.0-3ubuntu1.8'},
    {'osver': '22.04', 'pkgname': 'perl-base', 'pkgver': '5.34.0-3ubuntu1.8'},
    {'osver': '22.04', 'pkgname': 'perl-debug', 'pkgver': '5.34.0-3ubuntu1.8'},
    {'osver': '22.04', 'pkgname': 'perl-modules-5.34', 'pkgver': '5.34.0-3ubuntu1.8'}
];

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_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, 'libcgi-fast-perl / libperl5.18 / libperl5.22 / libperl5.26 / etc');
}