Debian dsa-6487 : 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-6487. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(343484);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/07");

  script_cve_id(
    "CVE-2026-78123",
    "CVE-2026-78124",
    "CVE-2026-78126",
    "CVE-2026-78127",
    "CVE-2026-78129",
    "CVE-2026-78130",
    "CVE-2026-78131",
    "CVE-2026-78132",
    "CVE-2026-78133",
    "CVE-2026-78134",
    "CVE-2026-78135"
  );

  script_name(english:"Debian dsa-6487 : charon-cmd - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dsa-6487 advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6487-1                   [email protected]
    https://www.debian.org/security/                        Yves-Alexis Perez
    September 06, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : strongswan
    CVE ID         : CVE-2026-78123 CVE-2026-78124 CVE-2026-78126 CVE-2026-78127
                     CVE-2026-78129 CVE-2026-78130 CVE-2026-78131 CVE-2026-78132
                     CVE-2026-78133 CVE-2026-78134 CVE-2026-78135

    Multiple vulnerabilities were found in strongSwan, an IKE/IPsec suite.

    CVE-2026-78123

        An undefined memory access vulnerability in the openssl plugin when
        handling PKCS#7 containers, that can result in a crash.

    CVE-2026-78124

        A memory leak in the openssl plugin during the enumeration of certificates
        in PKCS#7 containers.

    CVE-2026-78126

        A NULL-pointer dereference vulnerability in the eap-aka plugin when
        processing an unexpected AKA-Synchronization-Failure message, that can
        result in a crash.

    CVE-2026-78127

        Memory leak in libcharon message stringification during the logging of IKE
        messages, that can result in a denial of service via memory exhaustion.

    CVE-2026-78129

        An unbounded iteration in libstrongswan when decrypting encrypted PKCS#7
        containers, that can result in a denial of service.

    CVE-2026-78130

        A NULL-Pointer dereference vulnerability in the x509 plugin during the
        verification of X.509 attribute certificates, that can lead to a denial of
        service.

    CVE-2026-78131

        A memory leak in the x509 plugin during the parsing of identities in X.509
        attribute certificates, that can lead to a denial of service.

    CVE-2026-78132

        An infinite loop vulnerability in the x509 plugin when parsing the
        ietfAttrSyntax ASN.1 type in X.509 attribute certificates, that can lead to
        a denial of service.

    CVE-2026-78133

        A vulnerability in libcharon when handling IKEv2 rekeying collisions, that
        can result in a use-after-free and potentially remote code execution.

    CVE-2026-78134

        A vulnerability in the eap-peap and eap-ttls plugins in the propagation of
        authentication details from inner EAP methods. Missing Inner EAP
        authentication details can result in incorrect identity binding and
        potential authorization bypass.

    CVE-2026-78135

        A vulnerability in libcharon when handling CREATE_CHILD_SA requests on
        unestablished IKE SAs strongSwan, that can result in the creation of a
        usable Child SA before authentication completes.

    For the stable distribution (trixie), these problems have been fixed in
    version 6.0.1-6+deb13u7.

    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 these issues 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-2026-78123");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78124");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78126");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78127");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78129");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78130");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78131");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78132");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78133");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78134");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78135");
  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: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:N/I:N/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-2026-78135");

  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:"2026/09/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/07");

  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: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:"^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 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': '13.0', 'prefix': 'charon-cmd', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'charon-systemd', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'libcharon-extauth-plugins', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'libcharon-extra-plugins', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'libstrongswan', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'libstrongswan-extra-plugins', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'libstrongswan-standard-plugins', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'strongswan', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'strongswan-charon', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'strongswan-libcharon', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'strongswan-nm', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'strongswan-pki', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'strongswan-starter', 'reference': '6.0.1-6+deb13u7'},
    {'release': '13.0', 'prefix': 'strongswan-swanctl', 'reference': '6.0.1-6+deb13u7'}
];

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_WARNING,
    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');
}