OpenVPN 2.7_alpha1 < 2.7.5 DNS State Pollution / DoS (CVE-2026-13379)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(335012);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/13");

  script_cve_id("CVE-2026-13379");
  script_cwe_id(125, 142);

  script_name(english:"OpenVPN 2.7_alpha1 < 2.7.5 DNS State Pollution / DoS (CVE-2026-13379)");

  script_set_attribute(attribute:"synopsis", value:
"An application on the remote Windows host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the version of OpenVPN installed on the remote Windows host is 2.7_alpha1
through 2.7.4. It is, therefore, affected by a denial of service vulnerability:

  - The Windows interactive service in OpenVPN 2.7_alpha1 through 2.7.4 allows remote attackers to cause
    persistent DNS state pollution or a service crash via a crafted search domain during the disconnection
    process. (CVE-2026-13379)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://community.openvpn.net/Security%20Announcements/CVE-2026-13379
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ee258129");
  # https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?93848804");
  script_set_attribute(attribute:"solution", value:
"Upgrade to OpenVPN 2.7.5 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:N/VA:L/SC:H/SI:N/SA:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-13379");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:openvpn:openvpn");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("openvpn_server_installed.nbin");
  script_require_keys("installed_sw/OpenVPN Server");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'windows'}}
  ],
  'checks': [
    {
      'product': {'name': 'OpenVPN Server', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '2.7_alpha1', 'fixed_version': '2.7.5'}
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);