Debian dla-4118 : ghostscript - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4118. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(233980);
  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",
    "CVE-2025-27835",
    "CVE-2025-27836"
  );
  script_xref(name:"IAVB", value:"2025-B-0043-S");

  script_name(english:"Debian dla-4118 : ghostscript - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4118 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4118-1                [email protected]
    https://www.debian.org/lts/security/                          Adrian Bunk
    April 07, 2025                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : ghostscript
    Version        : 9.53.3~dfsg-7+deb11u10
    CVE ID         : CVE-2025-27830 CVE-2025-27831 CVE-2025-27832 CVE-2025-27835
                     CVE-2025-27836

    Multiple vulnerabilities have been fixed in the PostScript/PDF
    interpreter Ghostscript.

    CVE-2025-27830

        Buffer overflow via serialization of DollarBlend

    CVE-2025-27831

        Unicode decoding overrun

    CVE-2025-27832

        Integer overflow leading to buffer overflow

    CVE-2025-27835

        Confusion between bytes and shorts

    CVE-2025-27836

        Buffer overflow in bj10v device

    For Debian 11 bullseye, these problems have been fixed in version
    9.53.3~dfsg-7+deb11u10.

    We recommend that you upgrade your ghostscript packages.

    For the detailed security status of ghostscript please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/ghostscript

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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://security-tracker.debian.org/tracker/source-package/ghostscript");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-27830");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-27831");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-27832");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-27835");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-27836");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/ghostscript");
  script_set_attribute(attribute:"solution", value:
"Upgrade the ghostscript packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:N/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-2025-27836");

  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:"2025/04/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/04/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ghostscript");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ghostscript-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ghostscript-x");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgs-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgs9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgs9-common");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  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:"Debian 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/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'ghostscript', 'reference': '9.53.3~dfsg-7+deb11u10'},
    {'release': '11.0', 'prefix': 'ghostscript-doc', 'reference': '9.53.3~dfsg-7+deb11u10'},
    {'release': '11.0', 'prefix': 'ghostscript-x', 'reference': '9.53.3~dfsg-7+deb11u10'},
    {'release': '11.0', 'prefix': 'libgs-dev', 'reference': '9.53.3~dfsg-7+deb11u10'},
    {'release': '11.0', 'prefix': 'libgs9', 'reference': '9.53.3~dfsg-7+deb11u10'},
    {'release': '11.0', 'prefix': 'libgs9-common', 'reference': '9.53.3~dfsg-7+deb11u10'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ghostscript / ghostscript-doc / ghostscript-x / libgs-dev / libgs9 / etc');
}