WordPress Captcha Plugin < 4.4.5 Backdoor Vulnerability

# SPDX-FileCopyrightText: 2017 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

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.112155");
  script_version("2024-11-01T05:05:36+0000");
  script_tag(name:"last_modification", value:"2024-11-01 05:05:36 +0000 (Fri, 01 Nov 2024)");
  script_tag(name:"creation_date", value:"2017-12-27 09:34:51 +0100 (Wed, 27 Dec 2017)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_tag(name:"qod_type", value:"remote_banner");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("WordPress Captcha Plugin < 4.4.5 Backdoor Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_wordpress_plugin_http_detect.nasl");
  script_mandatory_keys("wordpress/plugin/captcha/detected");

  script_tag(name:"summary", value:"The WordPress plugin 'Captcha' is prone to a backdoor
  vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"affected", value:"WordPress Captcha plugin between version 4.3.6 and 4.4.4.");

  script_tag(name:"solution", value:"Update to version 4.4.5 or later.

  Another recommendation is that you uninstall the Captcha plugin immediately since the developer
  cannot be trusted.");

  script_xref(name:"URL", value:"https://www.wordfence.com/blog/2017/12/backdoor-captcha-plugin/");

  exit(0);
}

CPE = "cpe:/a:simplywordpress:captcha";

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

if( ! port = get_app_port( cpe: CPE ) )
  exit( 0 );

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

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

if( version_in_range( version: version, test_version: "4.3.6", test_version2: "4.4.4" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "4.4.5", install_path: location );
  security_message( port: port, data: report );
  exit( 0 );
}

exit( 99 );