Debian dsa-6507 : libunbound-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-6507. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(348572);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/21");

  script_cve_id(
    "CVE-2026-14586",
    "CVE-2026-32665",
    "CVE-2026-40622",
    "CVE-2026-40691",
    "CVE-2026-41637",
    "CVE-2026-42955",
    "CVE-2026-44621",
    "CVE-2026-44687",
    "CVE-2026-44690",
    "CVE-2026-46582",
    "CVE-2026-50045",
    "CVE-2026-50046",
    "CVE-2026-50243",
    "CVE-2026-50248",
    "CVE-2026-50251",
    "CVE-2026-50252",
    "CVE-2026-52863",
    "CVE-2026-54478",
    "CVE-2026-55708",
    "CVE-2026-55717",
    "CVE-2026-55973",
    "CVE-2026-55990",
    "CVE-2026-55991",
    "CVE-2026-56416",
    "CVE-2026-56444",
    "CVE-2026-77860",
    "CVE-2026-77955",
    "CVE-2026-78227",
    "CVE-2026-80225",
    "CVE-2026-81634",
    "CVE-2026-81642",
    "CVE-2026-82717",
    "CVE-2026-82720",
    "CVE-2026-85501"
  );

  script_name(english:"Debian dsa-6507 : libunbound-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-6507 advisory.

    -------------------------------------------------------------------------
    Debian Security Advisory DSA-6507-1                   [email protected]
    https://www.debian.org/security/                       Moritz Muehlenhoff
    September 19, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : unbound
    CVE ID         : CVE-2026-14586 CVE-2026-32665 CVE-2026-40622 CVE-2026-40691
                     CVE-2026-41637 CVE-2026-42955 CVE-2026-44621 CVE-2026-44687
                     CVE-2026-44690 CVE-2026-46582 CVE-2026-50045 CVE-2026-50046
                     CVE-2026-50243 CVE-2026-50248 CVE-2026-50251 CVE-2026-50252
                     CVE-2026-52863 CVE-2026-54478 CVE-2026-55708 CVE-2026-55717
                     CVE-2026-55973 CVE-2026-55990 CVE-2026-55991 CVE-2026-56416
                     CVE-2026-56444 CVE-2026-77860 CVE-2026-77955 CVE-2026-78227
                     CVE-2026-80225 CVE-2026-81634 CVE-2026-81642 CVE-2026-82717
                     CVE-2026-82720 CVE-2026-85501

    Multiple security vulnerabilities were discovered in Unbound, a validating,
    recursive, caching DNS resolver, which could result in denial of service,
    cache poisoning, DNS cookie bypass or potentially the execution of
    arbitrary code.

    For the stable distribution (trixie), these problems have been fixed in
    version 1.26.1-0+deb13u1.

    We recommend that you upgrade your unbound packages.

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

    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/unbound");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-14586");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-32665");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40622");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40691");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-41637");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42955");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-44621");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-44687");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-44690");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-46582");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-50045");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-50046");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-50243");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-50248");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-50251");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-50252");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-52863");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54478");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55708");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55717");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55973");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55990");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55991");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-56416");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-56444");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-77860");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-77955");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-78227");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-80225");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-81634");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-81642");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-82717");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-82720");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-85501");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/unbound");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libunbound-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:N/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:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-50252");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-81642");

  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:"2026/05/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libunbound-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libunbound8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound-anchor");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unbound-host");
  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': 'libunbound-dev', 'reference': '1.26.1-0+deb13u1'},
    {'release': '13.0', 'prefix': 'libunbound8', 'reference': '1.26.1-0+deb13u1'},
    {'release': '13.0', 'prefix': 'python3-unbound', 'reference': '1.26.1-0+deb13u1'},
    {'release': '13.0', 'prefix': 'unbound', 'reference': '1.26.1-0+deb13u1'},
    {'release': '13.0', 'prefix': 'unbound-anchor', 'reference': '1.26.1-0+deb13u1'},
    {'release': '13.0', 'prefix': 'unbound-host', 'reference': '1.26.1-0+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_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, 'libunbound-dev / libunbound8 / python3-unbound / unbound / etc');
}