Debian dsa-6330 : 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-6330. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(320467);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/11");

  script_cve_id("CVE-2026-47895");

  script_name(english:"Debian dsa-6330 : 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-6330
advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6330-1                   [email protected]
    https://www.debian.org/security/                        Yves-Alexis Perez
    June 08, 2026                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : strongswan
    CVE ID         : CVE-2026-47895
    Debian Bug     :

    Elliott Childre identified a vulnerability in strongSwan, an IKE/IPsec suite.
    The bug happens when cloning certain identities and can lead to a double-free,
    a daemon crash (leading to denial of service) and potentially remote code
    execution.

    Upstream lists several mitigations:
    - - Servers that don't use EAP or XAuth authentication are not vulnerable to
      remote attacks.
    - - Servers that use EAP authentication but delegate it to a RADIUS server and
      don't request an EAP-Identity themselves are not vulnerable either.  However,
      note that the `eap-radius` plugin parses `Class` and `Filter-Id` attributes
      as group identities if enabled, in which case a rogue RADIUS server is able
      to trigger the issue.
    - - Servers that use IKEv1 with XAuth are not vulnerable unless they use the
      `xauth-eap` plugin.

    For the oldstable distribution (bookworm), this problem has been fixed
    in version 5.9.8-5+deb12u5.

    For the stable distribution (trixie), this problem has been fixed in
    version 6.0.1-6+deb13u6.

    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-2026-47895");
  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:P/I:P/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: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-2026-47895");

  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:"2026/06/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/11");

  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+deb12u5'},
    {'release': '12.0', 'prefix': 'charon-systemd', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'libcharon-extauth-plugins', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'libcharon-extra-plugins', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'libstrongswan', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'libstrongswan-extra-plugins', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'libstrongswan-standard-plugins', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'strongswan', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'strongswan-charon', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'strongswan-libcharon', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'strongswan-nm', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'strongswan-pki', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'strongswan-starter', 'reference': '5.9.8-5+deb12u5'},
    {'release': '12.0', 'prefix': 'strongswan-swanctl', 'reference': '5.9.8-5+deb12u5'},
    {'release': '13.0', 'prefix': 'charon-cmd', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'charon-systemd', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'libcharon-extauth-plugins', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'libcharon-extra-plugins', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'libstrongswan', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'libstrongswan-extra-plugins', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'libstrongswan-standard-plugins', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'strongswan', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'strongswan-charon', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'strongswan-libcharon', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'strongswan-nm', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'strongswan-pki', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'strongswan-starter', 'reference': '6.0.1-6+deb13u6'},
    {'release': '13.0', 'prefix': 'strongswan-swanctl', 'reference': '6.0.1-6+deb13u6'}
];

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');
}