TencentOS Server 4: libvirt (TSSA-2026:0978)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2026:0978.
##

include('compat.inc');

if (description)
{
  script_id(344405);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/09");

  script_cve_id("CVE-2026-63622", "CVE-2026-63623");

  script_name(english:"TencentOS Server 4: libvirt (TSSA-2026:0978)");

  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-2026:0978 advisory.

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

    CVE-2026-63623:
    A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume
    images were temporarily world-readable. This was caused by the qemu-img utility running with overly
    permissive file creation settings, allowing any local user to read the full guest disk contents. This
    vulnerability could lead to sensitive information disclosure from guest virtual machines.

    CVE-2026-63622:
    A flaw was found in libvirt. A local attacker, specifically a process running as the confined swtpm user,
    could exploit a symlink-following vulnerability in the virFileChownFiles() function. By planting a
    symbolic link within the swtpm state directory, the attacker could trick the root-level libvirt daemon
    into changing the ownership of an arbitrary file to the swtpm user. This allows for privilege escalation
    from the swtpm sandbox to root-level file ownership control.

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-20260978.xml");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-2026-63622");

  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:"2026/08/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/09");

  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:libvirt");
  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) 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':'libvirt-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-client-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-client-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-client-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-client-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-client-qemu-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-client-qemu-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-config-network-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-config-network-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-config-nwfilter-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-config-nwfilter-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-interface-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-interface-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-interface-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-interface-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-lxc-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-lxc-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-lxc-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-lxc-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-network-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-network-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-network-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-network-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nodedev-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nodedev-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nodedev-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nodedev-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nwfilter-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nwfilter-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nwfilter-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-nwfilter-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-qemu-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-qemu-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-qemu-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-qemu-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-secret-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-secret-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-secret-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-secret-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-core-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-core-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-core-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-core-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-disk-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-disk-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-disk-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-disk-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-iscsi-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-iscsi-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-iscsi-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-iscsi-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-logical-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-logical-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-logical-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-logical-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-mpath-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-mpath-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-mpath-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-mpath-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-scsi-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-scsi-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-scsi-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-driver-storage-scsi-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-kvm-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-kvm-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-lxc-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-lxc-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-qemu-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-daemon-qemu-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-debugsource-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-debugsource-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-devel-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-devel-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-docs-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-docs-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-libs-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-libs-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-libs-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-libs-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-lock-sanlock-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-lock-sanlock-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-lock-sanlock-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-lock-sanlock-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-login-shell-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-login-shell-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-login-shell-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-login-shell-debuginfo-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-nss-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-nss-9.10.0-3.tl4.2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-nss-debuginfo-9.10.0-3.tl4.2', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libvirt-nss-debuginfo-9.10.0-3.tl4.2', '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_WARNING,
      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, 'libvirt / libvirt-client / libvirt-client-debuginfo / etc');
}