Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : Bind vulnerabilities (USN-7836-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7836-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(271258);
  script_version("1.3");
  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:"USN", value:"7836-1");
  script_xref(name:"IAVA", value:"2025-A-0800-S");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : Bind vulnerabilities (USN-7836-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.04 / 25.10 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-7836-1 advisory.

    Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain malformed DNSKEY records. A remote
    attacker could possibly use this issue to cause Bind to consume resources, resulting in a denial of
    service. (CVE-2025-8677)

    Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Bind incorrectly accepted certain
    records from answers. A remote attacker could possibly use this issue to perform a cache poisoning attack.
    (CVE-2025-40778)

    Amit Klein and Omer Ben Simhon discovered that Bind used a weak PRNG. A remote attacker could possibly use
    this issue to perform a cache poisoning attack. (CVE-2025-40780)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-7836-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-40780");

  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:"2025/10/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/10/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bind9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bind9-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bind9-dnsutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bind9-host");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bind9-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bind9-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:bind9utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dnsutils");
  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:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2025-2026 Canonical, Inc. / NASL script (C) 2025-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/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);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('22.04' >< os_release || '24.04' >< os_release || '25.04' >< os_release || '25.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 25.04 / 25.10', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '22.04', 'pkgname': 'bind9', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'bind9-dev', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'bind9-dnsutils', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'bind9-host', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'bind9-libs', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'bind9-utils', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'bind9utils', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '22.04', 'pkgname': 'dnsutils', 'pkgver': '1:9.18.39-0ubuntu0.22.04.2'},
    {'osver': '24.04', 'pkgname': 'bind9', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '24.04', 'pkgname': 'bind9-dev', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '24.04', 'pkgname': 'bind9-dnsutils', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '24.04', 'pkgname': 'bind9-host', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '24.04', 'pkgname': 'bind9-libs', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '24.04', 'pkgname': 'bind9-utils', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '24.04', 'pkgname': 'bind9utils', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '24.04', 'pkgname': 'dnsutils', 'pkgver': '1:9.18.39-0ubuntu0.24.04.2'},
    {'osver': '25.04', 'pkgname': 'bind9', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.04', 'pkgname': 'bind9-dev', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.04', 'pkgname': 'bind9-dnsutils', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.04', 'pkgname': 'bind9-host', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.04', 'pkgname': 'bind9-libs', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.04', 'pkgname': 'bind9-utils', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.04', 'pkgname': 'bind9utils', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.04', 'pkgname': 'dnsutils', 'pkgver': '1:9.20.11-0ubuntu0.2'},
    {'osver': '25.10', 'pkgname': 'bind9', 'pkgver': '1:9.20.11-1ubuntu2.1'},
    {'osver': '25.10', 'pkgname': 'bind9-dev', 'pkgver': '1:9.20.11-1ubuntu2.1'},
    {'osver': '25.10', 'pkgname': 'bind9-dnsutils', 'pkgver': '1:9.20.11-1ubuntu2.1'},
    {'osver': '25.10', 'pkgname': 'bind9-host', 'pkgver': '1:9.20.11-1ubuntu2.1'},
    {'osver': '25.10', 'pkgname': 'bind9-libs', 'pkgver': '1:9.20.11-1ubuntu2.1'},
    {'osver': '25.10', 'pkgname': 'bind9-utils', 'pkgver': '1:9.20.11-1ubuntu2.1'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'bind9 / bind9-dev / bind9-dnsutils / bind9-host / bind9-libs / etc');
}