Debian dla-4492 : gnutls-bin - 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-4492. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(299974);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/26");

  script_cve_id("CVE-2025-9820", "CVE-2025-14831");

  script_name(english:"Debian dla-4492 : gnutls-bin - 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 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4492 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4492-1                [email protected]
    https://www.debian.org/lts/security/                       Guilhem Moulin
    February 25, 2026                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : gnutls28
    Version        : 3.7.1-5+deb11u9
    CVE ID         : CVE-2025-9820 CVE-2025-14831
    Debian Bug     : 1121146

    Vulnerabilities were found in GnuTLS, a portable library which
    implements the Transport Layer Security and Datagram Transport Layer
    Security protocols, which may lead to Denial of Service.

    CVE-2025-9820

        An out-of-bound write issue was discovered when a PKCS#11 token is
        initialized with the `gnutls_pkcs11_token_init()` function and it is
        passed a token label longer than 32 characters.

    CVE-2025-14831

        Tim Scheckenbach discovered that verifying specially crafted
        malicious certificates containing a large number of name constraints
        and subject alternative names (SANs) could lead to resource
        exhaustion.

    For Debian 11 bullseye, these problems have been fixed in version
    3.7.1-5+deb11u9.

    We recommend that you upgrade your gnutls28 packages.

    For the detailed security status of gnutls28 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/gnutls28

    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: PGP signature

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/gnutls28");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-14831");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-9820");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/gnutls28");
  script_set_attribute(attribute:"solution", value:
"Upgrade the gnutls-bin 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:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-14831");

  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:"2025/11/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gnutls-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gnutls-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:guile-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls-dane0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls-openssl27");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls28-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls30");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutlsxx28");
  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) 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:"^(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': 'gnutls-bin', 'reference': '3.7.1-5+deb11u9'},
    {'release': '11.0', 'prefix': 'gnutls-doc', 'reference': '3.7.1-5+deb11u9'},
    {'release': '11.0', 'prefix': 'guile-gnutls', 'reference': '3.7.1-5+deb11u9'},
    {'release': '11.0', 'prefix': 'libgnutls-dane0', 'reference': '3.7.1-5+deb11u9'},
    {'release': '11.0', 'prefix': 'libgnutls-openssl27', 'reference': '3.7.1-5+deb11u9'},
    {'release': '11.0', 'prefix': 'libgnutls28-dev', 'reference': '3.7.1-5+deb11u9'},
    {'release': '11.0', 'prefix': 'libgnutls30', 'reference': '3.7.1-5+deb11u9'},
    {'release': '11.0', 'prefix': 'libgnutlsxx28', 'reference': '3.7.1-5+deb11u9'}
];

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, 'gnutls-bin / gnutls-doc / guile-gnutls / libgnutls-dane0 / etc');
}