Debian dsa-6549 : liblzma-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 dsa-6549. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(363958);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/07");

  script_name(english:"Debian dsa-6549 : liblzma-dev - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6549
advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6549-1                   [email protected]
    https://www.debian.org/security/                     Salvatore Bonaccorso
    October 07, 2026                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : xz-utils
    CVE ID         : not yet available
    Debian Bug     : 1147318

    It was discovered that an invalid memory write in the LZMA1 decoders of
    xz-utils, the XZ-format compression utilities, could result in denial of
    service or potentially the execution of arbitrary code.

    For the stable distribution (trixie), this problem has been fixed in
    version 5.8.1-1+deb13u2.

    We recommend that you upgrade your xz-utils packages.

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

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

    Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue 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/xz-utils");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/xz-utils");
  script_set_attribute(attribute:"solution", value:
"Upgrade the liblzma-dev packages.");
  script_set_attribute(attribute:"risk_factor", value:"High");

  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:"2026/10/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblzma-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblzma-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblzma5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:liblzma5-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xz-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xzdec");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  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:"^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 13.0', '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': '13.0', 'prefix': 'liblzma-dev', 'reference': '5.8.1-1+deb13u2'},
    {'release': '13.0', 'prefix': 'liblzma-doc', 'reference': '5.8.1-1+deb13u2'},
    {'release': '13.0', 'prefix': 'liblzma5', 'reference': '5.8.1-1+deb13u2'},
    {'release': '13.0', 'prefix': 'liblzma5-udeb', 'reference': '5.8.1-1+deb13u2'},
    {'release': '13.0', 'prefix': 'xz-utils', 'reference': '5.8.1-1+deb13u2'},
    {'release': '13.0', 'prefix': 'xzdec', 'reference': '5.8.1-1+deb13u2'}
];

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, 'liblzma-dev / liblzma-doc / liblzma5 / liblzma5-udeb / xz-utils / etc');
}