Debian dla-4364 : bind9 - 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-4364. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(272278);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/24");

  script_cve_id("CVE-2025-8677", "CVE-2025-40778", "CVE-2025-40780");
  script_xref(name:"IAVA", value:"2025-A-0800-S");

  script_name(english:"Debian dla-4364 : bind9 - 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-4364 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4364-1                [email protected]
    https://www.debian.org/lts/security/                   Andreas Henriksson
    November 04, 2025                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : bind9
    Version        : 1:9.16.50-1~deb11u4
    CVE ID         : CVE-2025-8677 CVE-2025-40778 CVE-2025-40780
    Debian Bug     :

    Brief introduction

    CVE-2025-8677

        Resource exhaustion via malformed DNSKEY handling

    CVE-2025-40778

        Cache poisoning attacks with unsolicited RRs

    CVE-2025-40780

        Cache poisoning due to weak PRNG

    For Debian 11 bullseye, these problems have been fixed in version
    1:9.16.50-1~deb11u4.

    We recommend that you upgrade your bind9 packages.

    For the detailed security status of bind9 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/bind9

    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
    Attachment:
    signature.asc
    Description: PGP signature

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/bind9");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-40778");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-40780");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-8677");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/bind9");
  script_set_attribute(attribute:"solution", value:
"Upgrade the bind9 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-40780");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/10/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-dnsutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bind9utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dnsutils");
  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': 'bind9', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'bind9-dev', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'bind9-dnsutils', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'bind9-doc', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'bind9-host', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'bind9-libs', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'bind9-utils', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'bind9utils', 'reference': '1:9.16.50-1~deb11u4'},
    {'release': '11.0', 'prefix': 'dnsutils', 'reference': '1:9.16.50-1~deb11u4'}
];

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, 'bind9 / bind9-dev / bind9-dnsutils / bind9-doc / bind9-host / etc');
}