Debian dla-4359 : charon-cmd - 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-4359. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(272195);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/03");

  script_cve_id("CVE-2025-62291");

  script_name(english:"Debian dla-4359 : charon-cmd - 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 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4359
advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4359-1                [email protected]
    https://www.debian.org/lts/security/                      Markus Koschany
    November 03, 2025                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : strongswan
    Version        : 5.9.1-1+deb11u5
    CVE ID         : CVE-2025-62291

    Xu Biang discovered a buffer overflow bug in the eap-mschapv2 plugin of
    strongSwan, an IKE/IPsec suite.

    The eap-mschapv2 plugin does not correctly check the length of an
    EAP-MSCHAPv2 Failure Request packet on the client, which can cause an
    integer underflow that leads to a crash, and a heap-based buffer overflow
    that's potentially exploitable for remote code execution.

    For Debian 11 bullseye, this problem has been fixed in version
    5.9.1-1+deb11u5.

    We recommend that you upgrade your strongswan packages.

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

    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
    Attachment:
    signature.asc
    Description: This is a digitally signed message part

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/strongswan");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-62291");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/strongswan");
  script_set_attribute(attribute:"solution", value:
"Upgrade the charon-cmd packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/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:H/PR:N/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-2025-62291");

  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:"2025/10/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:charon-cmd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:charon-systemd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcharon-extauth-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcharon-extra-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libstrongswan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libstrongswan-extra-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libstrongswan-standard-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan-charon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan-libcharon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan-nm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan-scepclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan-starter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan-swanctl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  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) 2025 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:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', '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': '11.0', 'prefix': 'charon-cmd', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'charon-systemd', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'libcharon-extauth-plugins', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'libcharon-extra-plugins', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'libstrongswan', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'libstrongswan-extra-plugins', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'libstrongswan-standard-plugins', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan-charon', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan-libcharon', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan-nm', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan-pki', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan-scepclient', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan-starter', 'reference': '5.9.1-1+deb11u5'},
    {'release': '11.0', 'prefix': 'strongswan-swanctl', 'reference': '5.9.1-1+deb11u5'}
];

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, 'charon-cmd / charon-systemd / libcharon-extauth-plugins / etc');
}