TencentOS Server 3: bind (TSSA-2026:0929)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2026:0929.
##

include('compat.inc');

if (description)
{
  script_id(341126);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/27");

  script_cve_id(
    "CVE-2026-10723",
    "CVE-2026-11622",
    "CVE-2026-11721",
    "CVE-2026-13204",
    "CVE-2026-13321"
  );
  script_xref(name:"IAVA", value:"2026-A-0764");

  script_name(english:"TencentOS Server 3: bind (TSSA-2026:0929)");

  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-2026:0929 advisory.

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

    CVE-2026-10723:
    BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge
    authenticated NXDOMAIN responses.
    This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23,
    9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

    CVE-2026-11622:
    A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can
    suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver
    can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured
    in the max-cache-size parameter.
    This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23,
    9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

    CVE-2026-11721:
    It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of
    labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a
    zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to
    have any effect, the resolver under attack must have set synth-from-dnssec yes; (which is the default).
    This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23,
    9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

    CVE-2026-13204:
    If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist
    an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating
    this proof.
    This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23,
    9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

    CVE-2026-13321:
    The BIND resolver accepts validly-signed NSEC records where the Next Domain Name field points outside
    the signer's zone.
    This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23,
    9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

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-20260929.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:C/A:N");
  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:C/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-13321");

  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:"2026/07/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/27");

  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:bind");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tencent 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_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':'bind-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-chroot-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-chroot-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-debugsource-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-debugsource-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-devel-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-devel-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-export-devel-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-export-devel-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-export-libs-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-export-libs-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-export-libs-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-export-libs-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-lite-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-lite-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-lite-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-libs-lite-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-license-9.11.36-16.tl3.14', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-lite-devel-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-lite-devel-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-devel-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-devel-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-libs-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-libs-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-libs-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-libs-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-utils-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-utils-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-utils-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-pkcs11-utils-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-chroot-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-chroot-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-sdb-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-utils-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-utils-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-utils-debuginfo-9.11.36-16.tl3.14', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'bind-utils-debuginfo-9.11.36-16.tl3.14', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'},
      {'reference':'python3-bind-9.11.36-16.tl3.14', 'rpm_spec_vers_cmp':TRUE, 'epoch':'32'}
    ]
  }
];

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, 'bind / bind-chroot / bind-debuginfo / etc');
}