AlmaLinux 8 : tigervnc (ALSA-2024:0607)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2024:0607.
##

include('compat.inc');

if (description)
{
  script_id(189842);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/31");

  script_cve_id(
    "CVE-2023-6816",
    "CVE-2024-0229",
    "CVE-2024-21885",
    "CVE-2024-21886"
  );
  script_xref(name:"ALSA", value:"2024:0607");

  script_name(english:"AlmaLinux 8 : tigervnc (ALSA-2024:0607)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ALSA-2024:0607 advisory.

  - 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-2023-6816)

  - The X.Org project reports: 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 number of buttons,
    leading to a heap overflow if a bigger value was used. If a device has both a button class and a key class
    and             numButtons is zero, we can get an out-of-bounds write due             to event under-
    allocation in the DeliverStateNotifyEvent             function. The XISendDeviceHierarchyEvent() function
    allocates space to             store up to MAXDEVICES (256) xXIHierarchyInfo structures in info.
    If a device with a given ID was removed and a new device with             the same ID added both in the
    same operation,             the single device ID will lead to two info structures being
    written to info.             Since this case can occur for every device ID at once,             a total of
    two times MAXDEVICES info structures might be written             to the allocation, leading to a heap
    buffer overflow. The DisableDevice() function is called whenever an enabled device             is disabled
    and it moves the device from the inputInfo.devices             linked list to the inputInfo.off_devices
    linked list.             However, its link/unlink operation has an issue during the recursive
    call to DisableDevice() due to the prev pointer pointing to a             removed device.             This
    issue leads to a length mismatch between the total number of             devices and the number of device
    in the list, leading to a heap             overflow and, possibly, to local privilege escalation.
    (CVE-2024-0229, CVE-2024-21885, CVE-2024-21886)

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://errata.almalinux.org/8/ALSA-2024-0607.html");
  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_cwe_id(119, 122, 788);

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/01/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/01/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/01/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:tigervnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:tigervnc-icons");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:tigervnc-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:tigervnc-selinux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:tigervnc-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:tigervnc-server-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:tigervnc-server-module");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::appstream");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::baseos");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::highavailability");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::nfv");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::powertools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::realtime");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::resilientstorage");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap_hana");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::supplementary");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Alma Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/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/AlmaLinux/release');
if (isnull(os_release) || 'AlmaLinux' >!< os_release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);

if (!get_kb_item('Host/AlmaLinux/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, 'AlmaLinux', cpu);

var pkgs = [
    {'reference':'tigervnc-1.13.1-2.el8_9.7.alma.1', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-1.13.1-2.el8_9.7.alma.1', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-icons-1.13.1-2.el8_9.7.alma.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-license-1.13.1-2.el8_9.7.alma.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-selinux-1.13.1-2.el8_9.7.alma.1', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-server-1.13.1-2.el8_9.7.alma.1', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-server-1.13.1-2.el8_9.7.alma.1', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-server-minimal-1.13.1-2.el8_9.7.alma.1', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-server-minimal-1.13.1-2.el8_9.7.alma.1', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-server-module-1.13.1-2.el8_9.7.alma.1', 'cpu':'aarch64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'tigervnc-server-module-1.13.1-2.el8_9.7.alma.1', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
];

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;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'Alma-' + 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 (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)) 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-icons / tigervnc-license / tigervnc-selinux / etc');
}