TencentOS Server 3: gnutls (TSSA-2025:0814)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2025:0814.
##

include('compat.inc');

if (description)
{
  script_id(271114);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/04");

  script_cve_id("CVE-2025-32988", "CVE-2025-32990", "CVE-2025-6395");

  script_name(english:"TencentOS Server 3: gnutls (TSSA-2025:0814)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 3 host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2025:0814 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2025-6395:
    A NULL pointer dereference flaw was found in the GnuTLS software in _gnutls_figure_common_ciphersuite().

    CVE-2025-32988:
    A flaw was found in GnuTLS. A double-free vulnerability exists in GnuTLS due to incorrect ownership
    handling in the export logic of Subject Alternative Name (SAN) entries containing an otherName. If the
    type-id OID is invalid or malformed, GnuTLS will call asn1_delete_structure() on an ASN.1 node it does not
    own, leading to a double-free condition when the parent function or caller later attempts to free the same
    structure.

    This vulnerability can be triggered using only public GnuTLS APIs and may result in denial of service or
    memory corruption, depending on allocator behavior.

    CVE-2025-32990:
    A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic
    within the certtool utility. When it reads certain settings from a template file, it allows an attacker to
    cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial-of-service
    (DoS) that could potentially crash the system.

Tenable has extracted the preceding description block directly from the Tencent Linux 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://mirrors.tencent.com/tlinux/errata/tssa-20250814.xml");
  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:P/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:L/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-2025-32990");

  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:"2025/10/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/10/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:gnutls");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tencent Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/etc/os-release", "Host/TencentOS/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'TencentOS' >!< os_product) audit(AUDIT_OS_NOT, 'TencentOS');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'TencentOS');
if (! preg(pattern:"^3([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 3.x', 'TencentOS ' + os_version);

if (!get_kb_item('Host/TencentOS/rpm-list')) 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, 'TencentOS', cpu);

var constraints = [
  {
    'release': '3',
    'pkgs': [
      {'reference':'gnutls-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-c++-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-c++-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-c++-debuginfo-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-c++-debuginfo-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-dane-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-dane-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-dane-debuginfo-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-dane-debuginfo-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-debuginfo-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-debuginfo-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-debugsource-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-debugsource-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-devel-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-devel-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-utils-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-utils-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-utils-debuginfo-3.6.16-8.tl3.4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'gnutls-utils-debuginfo-3.6.16-8.tl3.4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'gnutls / gnutls-c++ / gnutls-c++-debuginfo / etc');
}