Debian dsa-6571 : libxen-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-6571. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(366977);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/18");

  script_cve_id(
    "CVE-2026-62437",
    "CVE-2026-79602",
    "CVE-2026-79603",
    "CVE-2026-79604",
    "CVE-2026-79608",
    "CVE-2026-79609",
    "CVE-2026-79610",
    "CVE-2026-79611",
    "CVE-2026-102699",
    "CVE-2026-102700",
    "CVE-2026-102702"
  );

  script_name(english:"Debian dsa-6571 : libxen-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 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dsa-6571 advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6571-1                   [email protected]
    https://www.debian.org/security/                       Moritz Muehlenhoff
    October 18, 2026                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : xen
    CVE ID         : CVE-2026-62437 CVE-2026-79602 CVE-2026-79603 CVE-2026-79604
                     CVE-2026-79608 CVE-2026-79609 CVE-2026-79610 CVE-2026-79611
                     CVE-2026-102699 CVE-2026-102700 CVE-2026-102702

    Multiple vulnerabilities have been discovered in the Xen hypervisor,
    which could result in privilege escalation, information disclosure or
    denial of service.

    For the stable distribution (trixie), these problems have been fixed in
    version 4.20.4+39-gf1e1321c87-0+deb13u1.

    We recommend that you upgrade your xen packages.

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

    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 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/xen");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-102699");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-102700");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-102702");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-62437");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-79602");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-79603");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-79604");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-79608");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-79609");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-79610");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-79611");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/xen");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libxen-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/UI:N/S:C/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-2026-79610");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-79602");

  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:"2026/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxen-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxencall1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxendevicemodel1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxenevtchn1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxenforeignmemory1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxengnttab1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxenhypfs1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxenmisc4.20");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxenstore4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxentoolcore1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxentoollog1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.20-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.20-amd64-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.20-arm64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-4.20-arm64-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-hypervisor-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-system-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-system-arm64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-utils-4.20");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-utils-4.20-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xen-utils-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xenstore-utils");
  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_info2.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': 'libxen-dev', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxencall1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxendevicemodel1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxenevtchn1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxenforeignmemory1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxengnttab1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxenhypfs1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxenmisc4.20', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxenstore4', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxentoolcore1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libxentoollog1', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-doc', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-hypervisor-4.20-amd64', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-hypervisor-4.20-amd64-dbg', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-hypervisor-4.20-arm64', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-hypervisor-4.20-arm64-dbg', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-hypervisor-common', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-system-amd64', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-system-arm64', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-utils-4.20', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-utils-4.20-dbg', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xen-utils-common', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'},
    {'release': '13.0', 'prefix': 'xenstore-utils', 'reference': '4.20.4+39-gf1e1321c87-0+deb13u1'}
];

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, 'libxen-dev / libxencall1 / libxendevicemodel1 / libxenevtchn1 / etc');
}