Debian dsa-6176 : 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 dsa-6176. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(303374);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/31");

  script_cve_id("CVE-2026-25075");

  script_name(english:"Debian dsa-6176 : 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 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6176
advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6176-1                   [email protected]
    https://www.debian.org/security/                        Yves-Alexis Perez
    March 23, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : strongswan
    CVE ID         : CVE-2026-25075

    Kazuma Matsumoto discovered an integer overflow bug in the EAP-TTLS plugin of
    strongSwan, an IKE/IPsec suite.

    The EAP-TTLS plugin doesn't check the length field in the header of
    attribute-value pairs (AVPs) tunneled in EAP-TTLS, which can cause an integer
    underflow that may lead to a crash. An unauthenticated attacker could exploit
    this for a DoS attack by sending a crafted message.

    For the oldstable distribution (bookworm), this problem has been fixed
    in version 5.9.8-5+deb12u3.

    For the stable distribution (trixie), this problem has been fixed in
    version 6.0.1-6+deb13u4.

    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 Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/

    Mailing list: [email protected]

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-2026-25075");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/strongswan");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/strongswan");
  script_set_attribute(attribute:"solution", value:
"Upgrade the charon-cmd packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-25075");

  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:"2026/03/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/23");

  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-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:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  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]+|^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 12.0 / 13.0', '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': 'charon-cmd', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'charon-systemd', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'libcharon-extauth-plugins', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'libcharon-extra-plugins', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'libstrongswan', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'libstrongswan-extra-plugins', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'libstrongswan-standard-plugins', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'strongswan', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'strongswan-charon', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'strongswan-libcharon', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'strongswan-nm', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'strongswan-pki', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'strongswan-starter', 'reference': '5.9.8-5+deb12u3'},
    {'release': '12.0', 'prefix': 'strongswan-swanctl', 'reference': '5.9.8-5+deb12u3'},
    {'release': '13.0', 'prefix': 'charon-cmd', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'charon-systemd', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'libcharon-extauth-plugins', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'libcharon-extra-plugins', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'libstrongswan', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'libstrongswan-extra-plugins', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'libstrongswan-standard-plugins', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'strongswan', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'strongswan-charon', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'strongswan-libcharon', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'strongswan-nm', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'strongswan-pki', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'strongswan-starter', 'reference': '6.0.1-6+deb13u4'},
    {'release': '13.0', 'prefix': 'strongswan-swanctl', 'reference': '6.0.1-6+deb13u4'}
];

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');
}