TencentOS Server 2: libblockdev (TSSA-2025:0481)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2025:0481.
##

include('compat.inc');

if (description)
{
  script_id(241455);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/04");

  script_cve_id("CVE-2025-6019");

  script_name(english:"TencentOS Server 2: libblockdev (TSSA-2025:0481)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 2 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 2 host is prior to tested version. It is,
therefore, affected by a vulnerability as referenced in the TSSA-2025:0481 advisory.

    Package updates are available for TencentOS Server 2 that fix the following vulnerabilities:

    CVE-2025-6019:
    A Local Privilege Escalation (LPE) vulnerability was found in libblockdev. Generally, the allow_active
    setting in Polkit permits a physically present user to take certain actions based on the session type. Due
    to the way libblockdev interacts with the udisks daemon, an allow_active user on a system may be able
    escalate to full root privileges on the target host. Normally, udisks mounts user-provided filesystem
    images with security flags like nosuid and nodev to prevent privilege escalation.  However, a local
    attacker can create a specially crafted XFS image containing a SUID-root shell, then trick udisks into
    resizing it. This mounts their malicious filesystem with root privileges, allowing them to execute their
    SUID-root shell and gain complete control of the system.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue 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-20250481.xml");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-6019");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/06/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:libblockdev");
  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:"^2([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 2.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': '2',
    'pkgs': [
      {'reference':'libblockdev-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-btrfs-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-btrfs-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-btrfs-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-btrfs-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-crypto-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-crypto-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-crypto-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-crypto-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-debuginfo-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-debuginfo-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-dm-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-dm-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-dm-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-dm-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-fs-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-fs-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-fs-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-fs-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-kbd-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-kbd-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-kbd-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-kbd-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-loop-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-loop-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-loop-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-loop-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-lvm-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-lvm-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-lvm-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-lvm-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mdraid-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mdraid-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mdraid-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mdraid-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mpath-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mpath-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mpath-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-mpath-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-nvdimm-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-nvdimm-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-nvdimm-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-nvdimm-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-part-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-part-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-part-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-part-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-plugins-all-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-plugins-all-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-swap-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-swap-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-swap-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-swap-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-utils-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-utils-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-utils-devel-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-utils-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-vdo-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libblockdev-vdo-devel-2.18-5.tl2.1', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python2-blockdev-2.18-5.tl2.1', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python2-blockdev-2.18-5.tl2.1', '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, 'libblockdev / libblockdev-btrfs / libblockdev-btrfs-devel / etc');
}