Alibaba Cloud Linux 3 : 0095: tigervnc (ALINUX3-SA-2024:0095)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# Alibaba Cloud Linux Security Advisory ALINUX3-SA-2024:0095.
##

include('compat.inc');

if (description)
{
  script_id(236303);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/05/14");

  script_cve_id(
    "CVE-2023-5380",
    "CVE-2023-6816",
    "CVE-2024-0229",
    "CVE-2024-21885",
    "CVE-2024-21886",
    "CVE-2024-31080",
    "CVE-2024-31081",
    "CVE-2024-31083"
  );

  script_name(english:"Alibaba Cloud Linux 3 : 0095: tigervnc (ALINUX3-SA-2024:0095)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Alibaba Cloud Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced
in the ALINUX3-SA-2024:0095 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2023-5380:
    A use-after-free flaw was found in the xorg-x11-server. An X server crash may occur in a very specific and
    legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode) if
    the pointer is warped from within a window on one screen to the root window of the other screen and if the
    original window is destroyed followed by another window being destroyed.

    CVE-2023-6816:
    A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for
    each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the
    X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap
    overflow if a bigger value was used.

    CVE-2024-0229:
    An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a
    device frozen by a sync grab is reattached to a different master device. This issue may lead to an
    application crash, local privilege escalation (if the server runs with extended privileges), or remote
    code execution in SSH X11 forwarding environments.

    CVE-2024-21885:
    A flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the
    allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can
    trigger a heap buffer overflow condition, which may lead to an application crash or remote code execution
    in SSH X11 forwarding environments.

    CVE-2024-21886:
    A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may
    lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding
    environments.

    CVE-2024-31080:
    A heap-based buffer over-read vulnerability was found in the X.org server's ProcXIGetSelectedEvents()
    function. This issue occurs when byte-swapped length values are used in replies, potentially leading to
    memory leakage and segmentation faults, particularly when triggered by a client with a different
    endianness. This vulnerability could be exploited by an attacker to cause the X server to read heap memory
    values and then transmit them back to the client until encountering an unmapped page, resulting in a
    crash. Despite the attacker's inability to control the specific memory copied into the replies, the small
    length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds
    reads.

    CVE-2024-31081:
    A heap-based buffer over-read vulnerability was found in the X.org server's ProcXIPassiveGrabDevice()
    function. This issue occurs when byte-swapped length values are used in replies, potentially leading to
    memory leakage and segmentation faults, particularly when triggered by a client with a different
    endianness. This vulnerability could be exploited by an attacker to cause the X server to read heap memory
    values and then transmit them back to the client until encountering an unmapped page, resulting in a
    crash. Despite the attacker's inability to control the specific memory copied into the replies, the small
    length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds
    reads.

    CVE-2024-31083:
    A use-after-free vulnerability was found in the ProcRenderAddGlyphs() function of Xorg servers. This issue
    occurs when AllocateGlyph() is called to store new glyphs sent by the client to the X server, potentially
    resulting in multiple entries pointing to the same non-refcounted glyphs. Consequently,
    ProcRenderAddGlyphs() may free a glyph, leading to a use-after-free scenario when the same glyph pointer
    is subsequently accessed. This flaw allows an authenticated attacker to execute arbitrary code on the
    system by sending a specially crafted request.

Tenable has extracted the preceding description block directly from the Alibaba Cloud 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:"http://mirrors.aliyun.com/alinux/3/cve/alinux3-sa-20240095.xml");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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_set_attribute(attribute:"vuln_publication_date", value:"2023/10/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/05/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/05/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-icons");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-selinux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-server-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-server-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-server-minimal-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-server-module");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:tigervnc-server-module-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alibabacloud:alibaba_cloud_linux_3");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Alibaba Cloud Linux 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");
  script_require_keys("Host/local_checks_enabled", "Host/Alibaba/release", "Host/Alibaba/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Alibaba/release');
if (isnull(os_release) || 'Alibaba Cloud Linux' >!< os_release) audit(AUDIT_OS_NOT, 'Alibaba Cloud Linux');
var os_ver = pregmatch(pattern: "Alibaba Cloud Linux release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Alibaba Cloud Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^3([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Alibaba Cloud Linux 3.x', 'Alibaba Cloud Linux ' + os_ver);

if (!get_kb_item('Host/Alibaba/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Alibaba Cloud Linux', cpu);

var pkgs = [
    {'reference':'tigervnc-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-debuginfo-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-debuginfo-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-debugsource-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-debugsource-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-icons-1.13.1-10.0.1.al8', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-license-1.13.1-10.0.1.al8', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-selinux-1.13.1-10.0.1.al8', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-debuginfo-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-debuginfo-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-minimal-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-minimal-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-minimal-debuginfo-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-minimal-debuginfo-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-module-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-module-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-module-debuginfo-1.13.1-10.0.1.al8', 'cpu':'aarch64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
    {'reference':'tigervnc-server-module-debuginfo-1.13.1-10.0.1.al8', 'cpu':'x86_64', 'release':'3', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  var cves = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'Alibaba Linux ' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (rpm_check(release:_release, 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, 'tigervnc / tigervnc-debuginfo / tigervnc-debugsource / etc');
}