TencentOS Server 4: zvbi (TSSA-2025:0222)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2025:0222.
##

include('compat.inc');

if (description)
{
  script_id(276431);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/10");

  script_cve_id(
    "CVE-2025-2173",
    "CVE-2025-2174",
    "CVE-2025-2175",
    "CVE-2025-2176",
    "CVE-2025-2177"
  );
  script_xref(name:"IAVA", value:"2025-A-0190");

  script_name(english:"TencentOS Server 4: zvbi (TSSA-2025:0222)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 4 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 4 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2025:0222 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2025-2177:
    A vulnerability classified as critical was found in libzvbi up to 0.2.43. This vulnerability affects the
    function vbi_search_new of the file src/search.c. The manipulation of the argument pat_len leads to
    integer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and
    may be used. Upgrading to version 0.2.44 is able to address this issue. The patch is identified as
    ca1672134b3e2962cd392212c73f44f8f4cb489f. It is recommended to upgrade the affected component. The code
    maintainer was informed beforehand about the issues. She reacted very fast and highly professional.

    CVE-2025-2176:
    A vulnerability classified as critical has been found in libzvbi up to 0.2.43. This affects the function
    vbi_capture_sim_load_caption of the file src/io-sim.c. The manipulation leads to integer overflow. It is
    possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
    Upgrading to version 0.2.44 is able to address this issue. The identifier of the patch is
    ca1672134b3e2962cd392212c73f44f8f4cb489f. It is recommended to upgrade the affected component. The code
    maintainer was informed beforehand about the issues. She reacted very fast and highly professional.

    CVE-2025-2175:
    A vulnerability was found in libzvbi up to 0.2.43. It has been rated as problematic. Affected by this
    issue is the function _vbi_strndup_iconv. The manipulation leads to integer overflow. The attack may be
    launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version
    0.2.44 is able to address this issue. It is recommended to upgrade the affected component. The code
    maintainer was informed beforehand about the issues. She reacted very fast and highly professional.

    CVE-2025-2174:
    A vulnerability was found in libzvbi up to 0.2.43. It has been declared as problematic. Affected by this
    vulnerability is the function vbi_strndup_iconv_ucs2 of the file src/conv.c. The manipulation of the
    argument src_length leads to integer overflow. The attack can be launched remotely. The exploit has been
    disclosed to the public and may be used. Upgrading to version 0.2.44 is able to address this issue. The
    patch is named ca1672134b3e2962cd392212c73f44f8f4cb489f. It is recommended to upgrade the affected
    component. The code maintainer was informed beforehand about the issues. She reacted very fast and highly
    professional.

    CVE-2025-2173:
    A vulnerability was found in libzvbi up to 0.2.43. It has been classified as problematic. Affected is the
    function vbi_strndup_iconv_ucs2 of the file src/conv.c. The manipulation of the argument src_length leads
    to uninitialized pointer. It is possible to launch the attack remotely. The exploit has been disclosed to
    the public and may be used. Upgrading to version 0.2.44 is able to address this issue. The patch is
    identified as 8def647eea27f7fd7ad33ff79c2d6d3e39948dce. It is recommended to upgrade the affected
    component. The code maintainer was informed beforehand about the issues. She reacted very fast and highly
    professional.

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-20250222.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:N/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:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-2176");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2025-2177");

  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:"2025/03/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/03/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:zvbi");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025-2026 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:"^4([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 4.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': '4',
    'pkgs': [
      {'reference':'zvbi-0.2.44-1.oc9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-0.2.44-1.oc9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-debuginfo-0.2.44-1.oc9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-debuginfo-0.2.44-1.oc9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-debugsource-0.2.44-1.oc9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-debugsource-0.2.44-1.oc9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-devel-0.2.44-1.oc9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-devel-0.2.44-1.oc9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'zvbi-fonts-0.2.44-1.oc9', '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, 'zvbi / zvbi-debuginfo / zvbi-debugsource / etc');
}