Debian dla-4816 : libpcre2-16-0 - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4816. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(362868);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/03");

  script_cve_id("CVE-2026-103111");

  script_name(english:"Debian dla-4816 : libpcre2-16-0 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 12 host has packages installed that are affected by a vulnerability as referenced in the dla-4816
advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4816-1                [email protected]
    https://www.debian.org/lts/security/                 Salvatore Bonaccorso
    October 03, 2026                              https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : pcre2
    Version        : 10.42-1+deb12u2
    CVE ID         : CVE-2026-103111
    Debian Bug     : 1149217

    Michael Allen discovered an out-of-bounds write vulnerability in PCRE2,
    a library of functions to support Perl compatible regular expressions,
    which could result in denial of service or potentially the execution of
    arbitrary code.

    For Debian 12 bookworm, this problem has been fixed in version
    10.42-1+deb12u2.

    We recommend that you upgrade your pcre2 packages.

    For the detailed security status of pcre2 please refer to its security
    tracker page at:
    https://security-tracker.debian.org/tracker/pcre2

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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://security-tracker.debian.org/tracker/source-package/pcre2");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-103111");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/pcre2");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libpcre2-16-0 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:C/A:P");
  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:L/UI:N/S:U/C:L/I:H/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-103111");

  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:"2026/09/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpcre2-16-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpcre2-32-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpcre2-8-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpcre2-8-0-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpcre2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpcre2-posix3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:pcre2-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/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);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(12)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 12.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '12.0', 'prefix': 'libpcre2-16-0', 'reference': '10.42-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libpcre2-32-0', 'reference': '10.42-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libpcre2-8-0', 'reference': '10.42-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libpcre2-8-0-udeb', 'reference': '10.42-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libpcre2-dev', 'reference': '10.42-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libpcre2-posix3', 'reference': '10.42-1+deb12u2'},
    {'release': '12.0', 'prefix': 'pcre2-utils', 'reference': '10.42-1+deb12u2'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libpcre2-16-0 / libpcre2-32-0 / libpcre2-8-0 / libpcre2-8-0-udeb / etc');
}