Amazon Linux 2 : ghostscript (ALAS-2025-2805)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2025-2805.
##

include('compat.inc');

if (description)
{
  script_id(233686);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/21");

  script_cve_id("CVE-2025-27830", "CVE-2025-27831", "CVE-2025-27832");
  script_xref(name:"IAVB", value:"2025-B-0043-S");

  script_name(english:"Amazon Linux 2 : ghostscript (ALAS-2025-2805)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of ghostscript installed on the remote host is prior to 9.54.0-9. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2-2025-2805 advisory.

    Potential integer and buffer overflow with DollarBlend during serializing a multiple master font for
    passing to Freetype. Fixed by changing a variable type from short to unsigned short and checking if a
    length variable exceeds permitted limit.Fixed in ghostpdl-10.05.0 (CVE-2025-27830)

    Text buffer overflow with long characters; the txt_get_unicode function was copying too few bytes from the
    fixed glyph name to unicode mapping tables. This was probably causing incorrect Unicode code points in
    relatively rare cases but not otherwise a problem. However, a badly formed GlyphNames2Unicode array
    attached to a font could cause the decoding to spill over the assigned buffer.

    Patched in ghostpdl-10.05.0 (CVE-2025-27831)

    The calculation of the buffer size was being done with int values, and overflowing that data type. The bug
    has existed since the creation of the file contrib/japanese/gdevnpdl.cThe calculation of the buffer size
    was being done with int values, and overflowing that data type. By leaving the total size calculation to
    the memory manager, the calculation ends up being done in size_t values, and avoiding the overflow in this
    case, but also meaning the memory manager overflow protection will be effective.

    Fixed in ghostpdl-10.05.0

    Info: https://bugs.ghostscript.com/show_bug.cgi?id=708133Patch: https://cgit.ghostscript.com/cgi-
    bin/cgit.cgi/ghostpdl.git/commit/?id=57291c846334f1585552010faa42d7cb2cbd5c41 (CVE-2025-27832)

Tenable has extracted the preceding description block directly from the tested product 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://alas.aws.amazon.com/AL2/ALAS-2025-2805.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2025-27830.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2025-27831.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2025-27832.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update ghostscript' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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-2025-27831");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2025-27832");

  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:"2025/03/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/03/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/04/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ghostscript");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ghostscript-cups");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ghostscript-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ghostscript-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ghostscript-gtk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libgs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libgs-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var pkgs = [
    {'reference':'ghostscript-9.54.0-9.amzn2.0.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-9.54.0-9.amzn2.0.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-9.54.0-9.amzn2.0.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-cups-9.54.0-9.amzn2.0.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-cups-9.54.0-9.amzn2.0.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-cups-9.54.0-9.amzn2.0.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-debuginfo-9.54.0-9.amzn2.0.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-debuginfo-9.54.0-9.amzn2.0.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-debuginfo-9.54.0-9.amzn2.0.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-doc-9.54.0-9.amzn2.0.9', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-gtk-9.54.0-9.amzn2.0.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-gtk-9.54.0-9.amzn2.0.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ghostscript-gtk-9.54.0-9.amzn2.0.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libgs-9.54.0-9.amzn2.0.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libgs-9.54.0-9.amzn2.0.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libgs-9.54.0-9.amzn2.0.9', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libgs-devel-9.54.0-9.amzn2.0.9', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libgs-devel-9.54.0-9.amzn2.0.9', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libgs-devel-9.54.0-9.amzn2.0.9', 'cpu':'x86_64', 'release':'AL2', '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;
  var cves = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 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, "ghostscript / ghostscript-cups / ghostscript-debuginfo / etc");
}