Debian dla-4678 : libxfont-dev - 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-4678. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(326438);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/13");

  script_cve_id("CVE-2026-56001", "CVE-2026-56002", "CVE-2026-56003");

  script_name(english:"Debian dla-4678 : libxfont-dev - 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 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4678 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4678-1                [email protected]
    https://www.debian.org/lts/security/                       Andrej Shadura
    July 12, 2026                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libxfont
    Version        : 1:2.0.4-1+deb11u1 1:2.0.6-1+deb12u1
    CVE ID         : CVE-2026-56001 CVE-2026-56002 CVE-2026-56003

    A series of heap overflows in bitmap/PCF parser code could be used by
    authenticated attackers to execute code in the X server context.

    CVE-2026-56001

        A heap buffer overflow in BitmapScaleBitmaps in due to an overflowing
        32-bit size.

    CVE-2026-56002

        A heap bufferflow in pcfReadFont() due to missing glyph bounds
        checking.

    CVE-2026-56003

        A heap buffer overflow due to missing size checking in the property
        buffer when parsing PCF files in ComputeScaledProperties().

    For Debian 11 bullseye, these problems have been fixed in version
    1:2.0.4-1+deb11u1.

    For Debian 12 bookworm, these problems have been fixed in version
    1:2.0.6-1+deb12u1.

    We recommend that you upgrade your libxfont packages.

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

    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/libxfont");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-56001");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-56002");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-56003");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/libxfont");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/libxfont");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libxfont-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:L/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-2026-56003");

  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:"2026/07/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxfont-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxfont2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxfont2-udeb");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian 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_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]+|^(12)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0 / 12.0', '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': 'libxfont-dev', 'reference': '1:2.0.4-1+deb11u1'},
    {'release': '11.0', 'prefix': 'libxfont2', 'reference': '1:2.0.4-1+deb11u1'},
    {'release': '11.0', 'prefix': 'libxfont2-udeb', 'reference': '1:2.0.4-1+deb11u1'},
    {'release': '12.0', 'prefix': 'libxfont-dev', 'reference': '1:2.0.6-1+deb12u1'},
    {'release': '12.0', 'prefix': 'libxfont2', 'reference': '1:2.0.6-1+deb12u1'},
    {'release': '12.0', 'prefix': 'libxfont2-udeb', 'reference': '1:2.0.6-1+deb12u1'}
];

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_HOLE,
    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, 'libxfont-dev / libxfont2 / libxfont2-udeb');
}