CentOS Linux 8.4 [TuxCare] Security Update: grub2-common / grub2-efi-ia32 / grub2-efi-ia32-cdboot / etc Multiple Vulnerabilities (CENTOS8.4:CLSA-2025:1744222859)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(362266);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id(
    "CVE-2024-1048",
    "CVE-2024-45774",
    "CVE-2024-45775",
    "CVE-2024-45777",
    "CVE-2024-45780",
    "CVE-2024-45781",
    "CVE-2024-56737",
    "CVE-2025-0622",
    "CVE-2025-0624",
    "CVE-2025-1125"
  );
  script_xref(name:"CLSA", value:"2025:1744222859");

  script_name(english:"CentOS Linux 8.4 [TuxCare] Security Update: grub2-common / grub2-efi-ia32 / grub2-efi-ia32-cdboot / etc Multiple Vulnerabilities (CENTOS8.4:CLSA-2025:1744222859)");

  script_set_attribute(attribute:"synopsis", value:
"The CentOS Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The CentOS Linux 8.4 host has packages installed that are affected by multiple vulnerabilities as referenced in the
TuxCare CENTOS8.4:CLSA-2025:1744222859 advisory.

  - A flaw was found in the grub2-set-bootflag utility of grub2. After the fix of CVE-2019-14865, grub2-set-
    bootflag will create a temporary file with the new grubenv content and rename it to the original grubenv
    file. If the program is killed before the rename operation, the temporary file will not be removed and may
    fill the filesystem when invoked multiple times, resulting in a filesystem out of free inodes or blocks.
    (CVE-2024-1048)

  - A flaw was found in grub2. A specially crafted JPEG file can cause the JPEG parser of grub2 to incorrectly
    check the bounds of its internal buffers, resulting in an out-of-bounds write. The possibility of
    overwriting sensitive information to bypass secure boot protections is not discarded. (CVE-2024-45774)

  - A flaw was found in grub2 where the grub_extcmd_dispatcher() function calls grub_arg_list_alloc() to
    allocate memory for the grub's argument list. However, it fails to check in case the memory allocation
    fails. Once the allocation fails, a NULL point will be processed by the parse_option() function, leading
    grub to crash or, in some rare scenarios, corrupt the IVT data. (CVE-2024-45775)

  - A flaw was found in grub2. The calculation of the translation buffer when reading a language .mo file in
    grub_gettext_getstr_from_position() may overflow, leading to a Out-of-bound write. This issue can be
    leveraged by an attacker to overwrite grub2's sensitive heap data, eventually leading to the circumvention
    of secure boot protections. (CVE-2024-45777)

  - A flaw was found in grub2. When reading tar files, grub2 allocates an internal buffer for the file name.
    However, it fails to properly verify the allocation against possible integer overflows. It's possible to
    cause the allocation length to overflow with a crafted tar file, leading to a heap out-of-bounds write.
    This flaw eventually allows an attacker to circumvent secure boot protections. (CVE-2024-45780)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security.tuxcare.com/csaf/v2/els_os/centos8.4els/advisories/2025/clsa-2025_1744222859.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?851575e3");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2025:1744222859");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory CENTOS8.4:CLSA-2025:1744222859.");
  script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:N/UI:R/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-2025-1125");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/02/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/04/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CentOS 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/OS/extended-third-party", "Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}
include('rpm2.inc');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (empty_or_null(third_party_support) || third_party_support != 'TuxCare') exit(0, 'TuxCare support not enabled.');

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) || 'CentOS Linux' >!< os_product) audit(AUDIT_OS_NOT, 'CentOS Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS Linux');
if (! preg(pattern:"^8.4([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'CentOS Linux 8.4', 'CentOS Linux ' + os_version);

if (!get_kb_item('Host/CentOS/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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS Linux', cpu);


var constraints = [
  {
    'release': '8',
    'sp': '4',
    'pkgs': [
      {'reference':'grub2-common-2.02-106.el8.tuxcare.els9', 'sp':'4', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-efi-ia32-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-efi-ia32-cdboot-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-efi-ia32-modules-2.02-106.el8.tuxcare.els9', 'sp':'4', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-efi-x64-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-efi-x64-cdboot-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-pc-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-tools-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-tools-extra-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'grub2-tools-minimal-2.02-106.el8.tuxcare.els9', 'sp':'4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'}
    ]
  }
];

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_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, 'grub2-common / grub2-efi-ia32 / grub2-efi-ia32-cdboot / etc');
}