RHEL 6 : tigervnc (RHSA-2025:12751)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2025:12751. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(243455);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/08/04");

  script_cve_id(
    "CVE-2022-4283",
    "CVE-2022-46340",
    "CVE-2022-46341",
    "CVE-2022-46342",
    "CVE-2022-46343",
    "CVE-2022-46344",
    "CVE-2023-0494",
    "CVE-2023-1393",
    "CVE-2023-5367",
    "CVE-2023-6478",
    "CVE-2023-6816",
    "CVE-2024-0229",
    "CVE-2024-9632",
    "CVE-2024-21885",
    "CVE-2024-21886",
    "CVE-2024-31080",
    "CVE-2024-31081",
    "CVE-2024-31083"
  );
  script_xref(name:"RHSA", value:"2025:12751");

  script_name(english:"RHEL 6 : tigervnc (RHSA-2025:12751)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for tigervnc.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2025:12751 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop
    environment not only on the machine where it is running, but from anywhere on the Internet and from a wide
    variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)

    * xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)

    * xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)

    * xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)

    * xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)

    * xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)

    * xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)

    * xorg-x11-server: X.Org Server Overlay Window Use-After-Free Local Privilege Escalation Vulnerability
    (CVE-2023-1393)

    * xorg-x11-server: Out-of-bounds write in XIChangeDeviceProperty/RRChangeOutputProperty (CVE-2023-5367)

    * xorg-x11-server: out-of-bounds memory read in RRChangeOutputProperty and RRChangeProviderProperty
    (CVE-2023-6478)

    * xorg-x11-server: heap buffer overflow in XISendDeviceHierarchyEvent (CVE-2024-21885,ZDI-CAN-22744)

    * xorg-x11-server: heap buffer overflow in DisableDevice (CVE-2024-21886,ZDI-CAN-22840)

    * xorg-x11-server: reattaching to different master device may lead to out-of-bounds memory access
    (CVE-2024-0229,ZDI-CAN-22678)

    * xorg-x11-server: Heap buffer overflow in DeviceFocusEvent and ProcXIQueryPointer (CVE-2023-6816)

    * xorg-x11-server: Heap buffer overread/data leakage in ProcXIGetSelectedEvents (CVE-2024-31080)

    * xorg-x11-server: Heap buffer overread/data leakage in ProcXIPassiveGrabDevice (CVE-2024-31081)

    * xorg-x11-server: Use-after-free in ProcRenderAddGlyphs (CVE-2024-31083)

    * xorg-x11-server: tigervnc: heap-based buffer overflow privilege escalation vulnerability (CVE-2024-9632)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2151755");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2151756");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2151757");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2151758");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2151760");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2151761");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2165995");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2180288");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2243091");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2253298");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2256540");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2256542");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2256690");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2257691");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2271997");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2271998");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2272000");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2317233");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_12751.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6aaf8055");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2025:12751");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL tigervnc package based on the guidance in RHSA-2025:12751.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/AC:L/PR:N/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-2023-6816");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(121, 122, 125, 126, 190, 416, 787);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/12/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/08/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_els:6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-server-applet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-server-module");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat 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_info.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.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) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release(operator: 'ge', os_version: os_version, rhel_version: '6')) audit(AUDIT_OS_NOT, 'Red Hat 6.x', 'Red Hat ' + os_version);

if (!get_kb_item('Host/RedHat/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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'release': '6',
    'repo_relative_urls': [
      'content/els/rhel/server/6/6Server/i386/debug',
      'content/els/rhel/server/6/6Server/i386/extended-optional/debug',
      'content/els/rhel/server/6/6Server/i386/extended-optional/os',
      'content/els/rhel/server/6/6Server/i386/extended-optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/i386/extended/debug',
      'content/els/rhel/server/6/6Server/i386/extended/os',
      'content/els/rhel/server/6/6Server/i386/extended/source/SRPMS',
      'content/els/rhel/server/6/6Server/i386/optional/debug',
      'content/els/rhel/server/6/6Server/i386/optional/os',
      'content/els/rhel/server/6/6Server/i386/optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/i386/os',
      'content/els/rhel/server/6/6Server/i386/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/debug',
      'content/els/rhel/server/6/6Server/x86_64/extended-optional/debug',
      'content/els/rhel/server/6/6Server/x86_64/extended-optional/os',
      'content/els/rhel/server/6/6Server/x86_64/extended-optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/extended/debug',
      'content/els/rhel/server/6/6Server/x86_64/extended/os',
      'content/els/rhel/server/6/6Server/x86_64/extended/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/optional/debug',
      'content/els/rhel/server/6/6Server/x86_64/optional/os',
      'content/els/rhel/server/6/6Server/x86_64/optional/source/SRPMS',
      'content/els/rhel/server/6/6Server/x86_64/os',
      'content/els/rhel/server/6/6Server/x86_64/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/debug',
      'content/els/rhel/system-z/6/6Server/s390x/extended-optional/debug',
      'content/els/rhel/system-z/6/6Server/s390x/extended-optional/os',
      'content/els/rhel/system-z/6/6Server/s390x/extended-optional/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/extended/debug',
      'content/els/rhel/system-z/6/6Server/s390x/extended/os',
      'content/els/rhel/system-z/6/6Server/s390x/extended/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/optional/debug',
      'content/els/rhel/system-z/6/6Server/s390x/optional/os',
      'content/els/rhel/system-z/6/6Server/s390x/optional/source/SRPMS',
      'content/els/rhel/system-z/6/6Server/s390x/os',
      'content/els/rhel/system-z/6/6Server/s390x/source/SRPMS',
      'content/retired-els/rhel/server/6/6Server/x86_64/debug',
      'content/retired-els/rhel/server/6/6Server/x86_64/optional/debug',
      'content/retired-els/rhel/server/6/6Server/x86_64/optional/os',
      'content/retired-els/rhel/server/6/6Server/x86_64/optional/source/SRPMS',
      'content/retired-els/rhel/server/6/6Server/x86_64/os',
      'content/retired-els/rhel/server/6/6Server/x86_64/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'tigervnc-1.1.0-25.el6_10.13', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-1.1.0-25.el6_10.13', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-1.1.0-25.el6_10.13', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-1.1.0-25.el6_10.13', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-1.1.0-25.el6_10.13', 'cpu':'s390x', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-1.1.0-25.el6_10.13', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-applet-1.1.0-25.el6_10.13', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-module-1.1.0-25.el6_10.13', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-module-1.1.0-25.el6_10.13', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

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 repo_relative_urls;
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;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  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 &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!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)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'tigervnc / tigervnc-server / tigervnc-server-applet / etc');
}