OpenVPN 2.4.x < 2.4.6 DoS Vulnerability - Windows

# SPDX-FileCopyrightText: 2018 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:openvpn:openvpn";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.107310");
  script_version("2026-06-11T07:15:11+0000");
  script_tag(name:"last_modification", value:"2026-06-11 07:15:11 +0000 (Thu, 11 Jun 2026)");
  script_tag(name:"creation_date", value:"2018-05-11 09:50:01 +0200 (Fri, 11 May 2018)");
  script_tag(name:"cvss_base", value:"4.6");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2018-06-13 14:27:00 +0000 (Wed, 13 Jun 2018)");
  script_tag(name:"qod_type", value:"executable_version_unreliable");
  script_tag(name:"solution_type", value:"VendorFix");
  script_cve_id("CVE-2018-9336");
  script_name("OpenVPN 2.4.x < 2.4.6 DoS Vulnerability - Windows");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_openvpn_win_detect.nasl");
  script_mandatory_keys("OpenVPN/Win/Ver");
  script_tag(name:"summary", value:"OpenVPN is prone to a denial of service (DoS) vulnerability.");
  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
  script_tag(name:"insight", value:"openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before
  2.4.6 allows a local attacker to cause a double-free of memory by sending a malformed request to the interactive
  service. This could cause a denial-of-service through memory corruption or possibly have unspecified other impact
  including privilege escalation.");
  script_tag(name:"affected", value:"OpenVPN version 2.4.x before 2.4.6.");
  script_tag(name:"solution", value:"Upgrade to OpenVPN version 2.4.6 or later.");
  script_xref(name:"URL", value:"https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (!infos = get_app_version_and_location(cpe:CPE, exit_no_version:TRUE))
  exit(0);

vers = infos["version"];
path = infos["location"];

if (vers =~ "^2\.4\." && version_is_less(version:vers, test_version:"2.4.6")) {
  report = report_fixed_ver(installed_version:vers, fixed_version:"2.4.6", install_path:path);
  security_message(port:0, data:report);
  exit(0);
}

exit(99);