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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Geolocation Inference</title>
<meta name="description" content="Inferring geolocation of a user via browser cache.">
<meta name="author" content="Mohammad Doleh">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/white.css" id="theme">
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<script>
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
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<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>Geolocation Inference</h1>
<h3>Inferring user geolocation via browser cache.</h3>
<p>
Based on a paper by Yaoqi Jia, Xinshu Dongy, Zhenkai Liang, and Prateek Saxena.
</p>
<p>
<small>Presented by Mohammad Doleh</small>
</p>
</section>
<section>
<section>
<h2>Locating the User</h2>
<ul>
<li>IP Address</li>
<ul>
<li class="fragment">Users can use VPN or Tor for anonymity</li>
<li class="fragment">Not accurate for mobile networks</li>
</ul>
<li>Device GPS Sensors</li>
<ul>
<li class="fragment">Users can easily decline permission</li>
</ul>
</ul>
</section>
<section>
<h2>Some Websites Provide Location-Oriented Pages</h2>
<ul>
<li>Google.com</li>
<li>Craigslist</li>
<li>Google Maps</li>
</ul>
</section>
<section>
<h2>What's the Big Deal?</h2>
<ul>
<li>Modern browsers tend to cache static resources</li>
<li class="fragment">Can't query the browser cache</li>
<li class="fragment">But can observe the load time of the resource</li>
</ul>
</section>
<section>
<h2>Threat Model</h2>
<ul>
<li>Attacker has a website</li>
<li>A victim visits their site and gets their browser cache probed</li>
<li>Attacker can attempt to load location-based resources from popular sites to determine the victim's location</li>
<li class="fragment">We are assuming the victim as rejected GPS access and is using IP Address masking services (VPN or Tor)</li>
</ul>
</section>
</section>
<section>
<section>
<h2>Querying the Victim's Browser Cache #1</h2>
<ul>
<pre><code><img src="some-location-specific-resource" /></code></pre>
<li class="fragment">Save the start time and end time and compute the difference after the resource loads</li>
<pre class="fragment"><code>var image = document.createElement(‘img’);
image.src = url;
image.setAttribute(‘startTime’, (new Date().getTime()));
image.onload = function()
{
var endTime = new Date().getTime();
var loadTime = endTime - parseInt(this. getAttribute(‘startTime’));
}</code></pre>
</ul>
</section>
<section>
<h2>Querying the Victim's Browser Cache #2</h2>
<ul>
<li>Cross-Origin Resource Sharing (CORS)</li>
<ul>
<li class="fragment">Similar to the previous technique but make the request manually in JavaScript</li>
<pre class="fragment"><code>var starTime, endTime, loadTime;
var xmlhttp = new XMLHttpRequest();
xmlhttp.onloadstart = function()
{
startTime = (new Date()).getTime();
}
xmlhttp.onloadend = function()
{
endTime = (new Date()).getTime();
loadTime = endTime - startTime;
}
</code></pre>
</ul>
</ul>
</section>
<section>
<h2>Querying the Victim's Browser Cache #3</h2>
<ul>
<pre><code><img src="some-location-specific-resource" complete="complete"/></code></pre>
<ul>
<li class="fragment">Check the <i>complete</i> attribute of the image tag immediately after setting its <i>src</i> property</li>
</ul>
<pre class="fragment"><code>function cached(url)
{
var image = document.createElement(‘img’);
image.src = url;
return image.complete || image.width+image.height > 0;
}</code></pre>
</ul>
</section>
<section>
<h2>Querying the Victim's Browser Cache #4</h2>
<ul>
<li><iframe></li>
<ul>
<li class="fragment">Similar to CORS, measure the start and end time then compute the difference</li>
</ul>
<pre class="fragment"><code>var page = document.createElement(‘iframe’);
page.setAttribute(‘startTime’, (new Date()).getTime());
page.onload = function ()
{
var endTime = (new Date()).getTime();
var loadTime = ( endTime - parseInt(this.getAttribute(‘startTime’)));
}</code></pre>
</ul>
</section>
</section>
<section>
<h2>Geo-interence Attacks on Mainstream Browsers</h2>
<table>
<thead>
<tr>
<th>Browser</th>
<th>Image Load Time</th>
<th>CORS</th>
<th><img> <i>complete</i></th>
<th><iframe></th>
</tr>
</thead>
<tbody>
<tr>
<td>Chrome</td>
<td>X</td>
<td>X</td>
<td>-</td>
<td>X</td>
</tr>
<tr>
<td>Firefox</td>
<td>X</td>
<td>-</td>
<td>X</td>
<td>X</td>
</tr>
<tr>
<td>Safari</td>
<td>X</td>
<td>-</td>
<td>X</td>
<td>X</td>
</tr>
<tr>
<td>Opera</td>
<td>X</td>
<td>X</td>
<td>-</td>
<td>X</td>
</tr>
<tr>
<td>IE</td>
<td>X</td>
<td>-</td>
<td>X</td>
<td>X</td>
</tr>
</tbody>
</table>
</section>
<section>
<section>
<h2>Locating a Victim's Country</h2>
<ul>
<li>Google has 191 geography-specific domains (currently around 200)</li>
<li class="fragment">Utilize Google's logo image</li>
<ul class="fragment">
<li><i>google.com.sg</i></li>
<li><i>/images/srpr/logo11w.png</i></li>
</ul>
</ul>
</section>
<section>
<h2>Experiment</h2>
<ul>
<li>Attempted to request the logo image and observe the load time</li>
<li class="fragment">Utilized the <img> technique</li>
<li class="fragment">Queried for the logo 3 times and compared the first query to the other 2</li>
<li class="fragment">Logo's Max Age in Cache-Control header: 31536000ms ~ 8.76 hours</li>
</ul>
</section>
<section>
<h2>Results</h2>
<ul>
<img width="1792" height="430" data-src="images/country-graph.PNG" alt="Locating Country Graph">
<li class="fragment">Cache hits are easily distinguishable from cache misses</li>
</ul>
</section>
<section>
<h2>Live Demo</h2>
<ul>
<li><a href="#/4/3" onclick="locateViaCompleteTag(GOOGLE_DOMAIN_LIST, 'images/branding/googlelogo/1x/googlelogo_color_272x92dp.png')">Click for demo (Firefox, Safari, IE) Check console (F12)</a></li>
<li><a href="#/4/3" onclick="loadTimes = []; locateViaLoadTime(GOOGLE_DOMAIN_LIST, 'images/branding/googlelogo/1x/googlelogo_color_272x92dp.png')">Click for demo (Any Browser) Check console (F12)</a></li>
</ul>
<aside class="notes"><a href="https://www.google.com">Prime Cache</a></aside>
</section>
</section>
<section>
<section>
<h2>Locating a Victim's City</h2>
<ul>
<li>Craigslist has 712 geography-specific domains (currently around 714)</li>
<li class="fragment">Utilize the <iframe> method</li>
<ul class="fragment">
<li><i>https://cleveland.craigslist.org/</i></li>
<li><i>https://toledo.craigslist.org/</i></li>
</ul>
</ul>
</section>
<section>
<h2>Experiment</h2>
<ul>
<li>Attempted to request the local page and compare load times utilizing the <iframe> method</li>
<li class="fragment">Queried each of Craigslist's 712 city-oriented websites 3 times</li>
<li class="fragment">The first query was compared to the other 2</li>
</ul>
</section>
<section>
<h2>Results</h2>
<ul>
<img width="1433" height="245" data-src="images/city-graph.PNG" alt="Locating City Graph">
<li class="fragment">Cache hits are easily distinguishable from cache misses</li>
<div class="fragment">
<li><a href="#/5/2" onclick="loadTimes = []; locateViaIframe(CRAIGSLIST_OHIO_DOMAINS)">Click for iframe demo (Any Browser), check console (F12)</a></li>
<ul>
<li class="fragment">As of recently, the <iframe> method no longer works with Craigslist due to the use of the X-Frame-Options=SAMEORIGIN response header</li>
</ul>
<li><a href="#/5/2" onclick="loadTimes = []; locateViaCors(CRAIGSLIST_OHIO_DOMAINS)">Click for CORS demo (Any Browser), check console (F12)</a></li>
</div>
<aside class="notes"><a href="https://cleveland.craigslist.org">Prime Cache</a></aside>
</ul>
</section>
</section>
<section>
<section>
<h2>Locating a Victim's Neighborhood</h2>
<ul>
<li>Google Maps tiles are cached with coordinate information</li>
<pre class="fragment"><code data-noescape>google.com/maps/vt/pb=!1m5!1m4!1i15!2i<mark>12627</mark>!3i<mark>23720</mark>!4i128!2m1!1e0!3m3!5e1105!12m1!1e47!4e0</code></pre>
<li class="fragment">A specific area will have similar URLs so it is possible to predict the URL for other map tiles</li>
</ul>
</section>
<section>
<h2>Experiment</h2>
<ul>
<li>Utilized the <img> method and analyzed load times</li>
<li class="fragment">Measured image load time of 4,646 map tiles in New York City</li>
<li class="fragment">Each tile queried 3 times and the first query was compared to the other 2</li>
<li class="fragment">Max Age in Cache-Control header: 22222222ms ~ 6.17 hours</li>
</ul>
</section>
<section>
<h2>Results</h2>
<ul>
<img width="1142" height="287" data-src="images/neighborhood-graph.PNG" alt="Locating Neighborhood Graph">
<li class="fragment">Difference between cache hit and cache miss was large and easily seen</li>
<li class="fragment"><a href="#/6/2" onclick="loadTimes = []; locateViaLoadTimeMaps(GOOGLE_MAPS_LIST)">Click for Demo (Any Browser), check console (F12)</a></li>
<aside class="notes"><a href="https://www.google.com/maps/@41.5043453,-81.6105725,17z">Prime Cache</a></aside>
</ul>
</section>
</section>
<section>
<section>
<h2>Reliability of Timing-Based Attacks</h2>
<ul>
<li>Chrome, Firefox, Safari, Opera, and IE are all vulnerable</li>
</ul>
</section>
<section>
<h2>Experiment</h2>
<ul>
<li>Measure page load times 3 times per site against the top 100 Alexa websites</li>
<li class="fragment">The average of the 2nd and 3rd measurements are considered cache hit times</li>
</ul>
</section>
<section>
<h2>Results</h2>
<ul>
<img width="1451" height="265" data-src="images/top-alexa-graph.PNG" alt="Locating Neighborhood Graph">
<li class="fragment">Can reliably measure load time and sniff browser history</li>
</ul>
</section>
<section>
<h2>Some Observations</h2>
<ul>
<li>Websites can set X-Frame-Options to SAMEORIGIN or DENY in response headers</li>
<li class="fragment">This would prevent loading sites into frames</li>
<li class="fragment">Page load time would equal request load time preventing this attack</li>
<li class="fragment">However, location-specific resources can still be targeted individually</li>
</ul>
</section>
</section>
<section>
<section>
<h2>Prevalence of Location-Specific Resources</h2>
<ul>
<li>How many websites utilize location-sensitive resources?</li>
</ul>
</section>
<section>
<h2>Experiment</h2>
<ul>
<li>Analyzed top 100 Alexa websites and identified location-sensitive sites and their resources</li>
<li class="fragment">Excluded 45 domains due to the following:</li>
<ul class="fragment">
<li>Sites related to specific countries (e.g. google.de)</li>
<li>Sites with pornographic material</li>
<li>Unreachable sites (e.g. akamaihd.net)</li>
</ul>
<li class="fragment">Visited 55 websites in 5 different countries and recorded URLs of cached resources</li>
</ul>
</section>
<section>
<h2>Results</h2>
<ul>
<li>62% of the analyzed websites have location-specific resources</li>
<li>A user having visited any of those sites would be vulnerable to the geo-inference attacks</li>
</ul>
</section>
</section>
<section>
<section>
<h2>Is this an Effective Attack?</h2>
<ul>
<li>Does not directly pinpoint geo-locations of users</li>
<li class="fragment">Can only verify if a user has been to a given location</li>
</ul>
</section>
<section>
<h2>Usage Examples</h2>
<ul>
<li>Paper author wants to know which of 20 cities a review came from</li>
<li>Targeting specific areas</li>
</ul>
</section>
<section>
<h2>Problems with Time</h2>
<ul>
<li>Google Maps has 4,646 map tiles for New York City alone</li>
<li>5-10 geo-locations can verified every second</li>
<li>Can take up to 8 minutes of time</li>
<li class="fragment">Can reduce time by running calls in parallel</li>
</ul>
</section>
</section>
<section>
<section>
<h2>Potential Defenses</h2>
<ul>
<li>Existing defenses can prevent this type of attack</li>
</ul>
</section>
<section>
<h2>What Doesn't Work</h2>
<ul>
<li>Private browsing</li>
<ul>
<li>Cache is only cleared once the browser is closed not during its use</li>
</ul>
<div class="fragment">
<li>VPN</li>
<ul>
<li>Masking an IP Address does nothing about the browser cache</li>
</ul>
</div>
<div class="fragment">
<li>Tor</li>
<ul>
<li>Tor browser disables disk cache by default</li>
<li class="fragment">Browser cache is still active in <u>memory</u></li>
</ul>
</div>
</ul>
</section>
<section>
<h2>What Could Work</h2>
<ul>
<li>Segregating browser cache between websites</li>
<ul>
<li>Would work but is expensive in terms of load time</li>
<li>50% performance overhead</li>
</ul>
<div class="fragment">
<li>XMLHttpRequest</li>
<ul>
<li>Browsers can block status notifications if the website denied the request to access it</li>
<li>Would prevent the CORS & <iframe> methods but <img> method could still work</li>
</ul>
</div>
</ul>
</section>
<section>
<h2>What Else Could Work?</h2>
<ul>
<li>Add noise into measurement mechanisms related to browser cache queries</li>
<ul>
<li>Would need to be carefully engineered to not interfere with browser performance</li>
</ul>
<div class="fragment">
<li>Server-side protection</li>
<ul>
<li>Websites may switch to non-geo-targeting mode upon request of users</li>
<li>Likely will degrade site performance</li>
<li class="fragment">Could also periodically randomize URLs of geo-targeting resources</li>
<li class="fragment">Could also use cache-invalidating headers in HTTP response on location-based resources</li>
</ul>
</div>
</ul>
</section>
<section>
<h2>Even More Solutions</h2>
<ul>
<li>Server-side protection Part 2</li>
<ul>
<li class="fragment">Prototype tool collects URLs of cached resources and labels location-sensitive resources</li>
<li class="fragment">Can be utilized to identify resources that require the cache-invalidating header</li>
</ul>
<div class="fragment">
<li>Browsers can allow end users to opt out of caching</li>
<ul>
<li>In solutions aimed for privacy, it should be the default option</li>
</ul>
</div>
</ul>
</section>
<section>
<h2>Some Ideas of My Own</h2>
<ul>
<li>Browser extension</li>
<ul>
<li>Automatically clear the browser cache on each tab open and close</li>
<li>Could make it smarter by only clearing items in cache containing a given URL</li>
</ul>
<div class="fragment">
<li><img> tags are not treated with the same restrictions as straight web requests from the client</li>
<ul>
<li>Browsers could treat <img> tags with the same restrictions as CORS requests</li>
<li class="fragment">Could break a significant portion of websites with this change (ex: <i>Buzzfeed</i>)</li>
</ul>
</div>
</ul>
</section>
</section>
<section>
<h2>Some Thoughts</h2>
<li>If I can convince a user to visit my site, couldn't I just have malware downloaded to their machine?</li>
<li class="fragment">It's slightly misleading when they say they've scanned the top 100 Alexa websites when they left out almost half</li>
</section>
<section>
<h2>Slides Available Here</h2>
<h3><a href="http://mdoleh.github.io/Geolocation-Inference/">http://mdoleh.github.io/Geolocation-Inference/</a></h3>
</section>
</div>
</div>
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var GOOGLE_MAPS_LIST = case_western_list.concat(columbus_list);
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