Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : strongSwan vulnerabilities (USN-8196-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8196-1. 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(309912);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/15");

  script_cve_id(
    "CVE-2026-35328",
    "CVE-2026-35329",
    "CVE-2026-35330",
    "CVE-2026-35331",
    "CVE-2026-35332",
    "CVE-2026-35333",
    "CVE-2026-35334"
  );
  script_xref(name:"USN", value:"8196-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : strongSwan vulnerabilities (USN-8196-1)");

  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 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-8196-1 advisory.

    Haruto Kimura discovered that strongSwan incorrectly handled the supported_versions extension in TLS. A
    remote attacker could possibly use this issue to cause strongSwan to stop responding, resulting in a
    denial of service. (CVE-2026-35328)

    Haruto Kimura discovered that strongSwan incorrectly handled certain encrypted PKCS#7 containers. A remote
    attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service.
    (CVE-2026-35329)

    Lukas Johannes Moeller discovered that strongSwan incorrectly handled certain EAP-SIM/AKA attributes. A
    remote attacker could use this issue to cause strongSwan to stop responding, resulting in a denial of
    service, or possibly execute arbitrary code. (CVE-2026-35330)

    Haruto Kimura discovered that strongSwan incorrectly handled processing of X.509 name constraints. A
    remote attacker could possibly use this issue to bypass excluded name constraints. (CVE-2026-35331)

    Haruto Kimura discovered that strongSwan incorrectly processed ECDH public values. A remote attacker could
    possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-35332)

    Lukas Johannes Moeller discovered that strongSwan incorrectly handled certain RADIUS attributes. A remote
    attacker could possibly use this issue to cause strongSwan to crash, resulting in a denial of service.
    (CVE-2026-35333)

    Ryo Shimada discovered that strongSwan incorrectly handled RSA decryption. A remote attacker could
    possibly use this issue to cause strongSwan to crash, resulting in a denial of service. (CVE-2026-35334)

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-8196-1");
  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:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-35334");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:charon-cmd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:charon-systemd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcharon-extauth-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcharon-extra-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libstrongswan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libstrongswan-extra-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libstrongswan-standard-plugins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan-charon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan-libcharon");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan-nm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan-pki");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan-scepclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan-starter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:strongswan-swanctl");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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_info.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 (! ('22.04' >< os_release || '24.04' >< os_release || '25.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.10', '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': '22.04', 'pkgname': 'charon-cmd', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'charon-systemd', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'libcharon-extauth-plugins', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'libcharon-extra-plugins', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'libstrongswan', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'libstrongswan-extra-plugins', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'libstrongswan-standard-plugins', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan-charon', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan-libcharon', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan-nm', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan-pki', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan-scepclient', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan-starter', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '22.04', 'pkgname': 'strongswan-swanctl', 'pkgver': '5.9.5-2ubuntu2.6'},
    {'osver': '24.04', 'pkgname': 'charon-cmd', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'charon-systemd', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libcharon-extauth-plugins', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libcharon-extra-plugins', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libstrongswan', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libstrongswan-extra-plugins', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'libstrongswan-standard-plugins', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'strongswan', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'strongswan-charon', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'strongswan-libcharon', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'strongswan-nm', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'strongswan-pki', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'strongswan-starter', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '24.04', 'pkgname': 'strongswan-swanctl', 'pkgver': '5.9.13-2ubuntu4.24.04.3'},
    {'osver': '25.10', 'pkgname': 'charon-cmd', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'charon-systemd', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'libcharon-extauth-plugins', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'libcharon-extra-plugins', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'libstrongswan', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'libstrongswan-extra-plugins', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'libstrongswan-standard-plugins', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'strongswan', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'strongswan-charon', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'strongswan-libcharon', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'strongswan-nm', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'strongswan-pki', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'strongswan-starter', 'pkgver': '6.0.1-6ubuntu4.3'},
    {'osver': '25.10', 'pkgname': 'strongswan-swanctl', 'pkgver': '6.0.1-6ubuntu4.3'}
];

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