{"id":1518,"date":"2021-02-24T11:13:13","date_gmt":"2021-02-24T16:13:13","guid":{"rendered":"https:\/\/www.pwvconsultants.com\/blog\/?p=1518"},"modified":"2021-02-24T11:13:15","modified_gmt":"2021-02-24T16:13:15","slug":"favicons-pose-privacy-vulnerability-with-supercookies","status":"publish","type":"post","link":"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/","title":{"rendered":"Favicons Pose Privacy Vulnerability With Supercookies"},"content":{"rendered":"\n

Favicons are incredibly useful for users, but the way they function can pose a privacy problem. New research shows favicons can bypass VPNs and other activity cloaking services. <\/h2>\n\n\n\n

The idea of a tabbed user interface (UI) has been around for decades, including inside lesser-known web browsers. But it wasn\u2019t until Safari (2003) and Internet Explorer 7 (2006) were released that the common internet user became familiar with tabs. Now, instead of having 85 internet windows open, we have maybe two or three windows, each with 85 tabs on them. So how do we tell what each tab is and what we might have been using it for? Enter favicons, tiny logos in the corner of each tab to identify what website is on that page. <\/p>\n\n\n\n

This is a good thing, right? It helps us keep track of what we are doing without having to click on each tab and wait for the page to reload. Most of us would agree that it simplifies our workday and helps us organize our tasks. The problem is, favicons can pose a security problem. Is nothing sacred? They could potentially let websites track your movement regardless of how you are browsing. Meaning a VPN doesn\u2019t matter, incognito mode doesn\u2019t matter, private mode doesn\u2019t matter, any other way you might try to cloak your internet activity doesn\u2019t matter. Your activity can be tracked by a Supercookie.<\/p>\n\n\n\n

German software designer Jonas Strehle got the idea for researching favicons for tracking users after he read a research paper<\/a>.<\/p>\n\n\n\n

\u201cThe favicons must be made very easily accessible by the browser. Therefore, they are cached in a separate local database on the system, called the favicon cache (F-Cache).<\/p>

\u201cWhen a user visits a website, the browser checks if a favicon is needed by looking up the source of the shortcut icon link reference of the requested webpage. The browser initially checks the local F-cache for an entry containing the URL of the active website. If a favicon entry exists, the icon will be loaded from the cache and then displayed. However, if there is no entry, for example because no favicon has ever been loaded under this particular domain, or the data in the cache is out of date, the browser makes a GET request to the server to load the site’s favicon.<\/p>

By combining the state of delivered and not delivered favicons for specific URL paths for a browser, a unique pattern (identification number) can be assigned to the client. When the website is reloaded, the web server can reconstruct the identification number with the network requests sent by the client for the missing favicons and thus identify the browser.\u201d<\/p>Strehle’s GitHub<\/a><\/cite><\/blockquote>\n\n\n\n

For research purposes, Strehle set up a website<\/a> that shows how easy it is to track a user online with a favicon. He\u2019s also included an explanation of how supercookies work.<\/p>\n\n\n\n

The biggest concern with this is how it bypasses methods used to mask internet activity. VPNs, dark mode, incognito mode, private mode, whatever method is being used is easily circumvented by the favicon. It is important to remember, though, that this is research. It\u2019s proof-of-concept, this has not yet been seen in the wild. At least, as far as we know.<\/p>\n\n\n\n

The other consideration with favicon being able to bypass those methods is if a threat actor can figure out how to exploit that access and do bad things. If they figure out a way to bypass VPNs, for instance, businesses worldwide will have to make some serious adjustments to their security protocols. Thankfully, that hasn\u2019t happened, and VPNs have been around for a long time. For now, it\u2019s up to the browsers to make adjustments. There are many privacy implications with this type of tracking, and until a fix is implemented, there will be some who will gather this information and use it to their ends.<\/p>\n\n\n\n

For business leaders, your main goal in regard to this matter is to keep an eye out for a fix. As soon as it\u2019s released, every browser on your system needs to be updated. Remember, it can\u2019t wait. If you don\u2019t fix it and a threat actor somehow figures out how to exploit this issue, your business is on the hook. Have a plan in place so that when the fix is rolled out, your team can get started as soon as possible.<\/p>\n","protected":false},"excerpt":{"rendered":"

Favicons help us navigate our browser windows easily, but new research shows they present a privacy problem via Supercookies.<\/p>\n","protected":false},"author":1,"featured_media":1543,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[1969,2134,14],"tags":[36,2151,2149,2150,2153,1820,2148,2152,689,2154],"yoast_head":"\nFavicons Pose Privacy Vulnerability With Supercookies - PWV Consultants<\/title>\n<meta name=\"description\" content=\"Favicons help us navigate our browser windows easily, but new research shows they present a privacy problem via Supercookies.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Favicons Pose Privacy Vulnerability With Supercookies\" \/>\n<meta property=\"og:description\" content=\"Favicons help us navigate our browser windows easily, but new research shows they present a privacy problem via Supercookies.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/\" \/>\n<meta property=\"og:site_name\" content=\"PWV Consultants\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/PWV-Consultants-110444033947964\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-24T16:13:13+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-02-24T16:13:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.pwvconsultants.com\/blog\/wp-content\/uploads\/2021\/02\/Favicon-Supersookie-scaled.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1440\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Pieter VanIperen\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@PWV_Consultants\" \/>\n<meta name=\"twitter:site\" content=\"@PWV_Consultants\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Pieter VanIperen\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/\"},\"author\":{\"name\":\"Pieter VanIperen\",\"@id\":\"https:\/\/www.pwvconsultants.com\/blog\/#\/schema\/person\/c15d5d40126a8ad906cb3067de95f8d4\"},\"headline\":\"Favicons Pose Privacy Vulnerability With Supercookies\",\"datePublished\":\"2021-02-24T16:13:13+00:00\",\"dateModified\":\"2021-02-24T16:13:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/\"},\"wordCount\":739,\"publisher\":{\"@id\":\"https:\/\/www.pwvconsultants.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.pwvconsultants.com\/blog\/wp-content\/uploads\/2021\/02\/Favicon-Supersookie-scaled.jpeg\",\"keywords\":[\"Business\",\"Dark Mode\",\"Favicon\",\"Incognito Mode\",\"logos\",\"privacy\",\"Supercookie\",\"tabbed browsing\",\"VPN\",\"web browsing\"],\"articleSection\":[\"Business\",\"Privacy\",\"Security\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/\",\"url\":\"https:\/\/www.pwvconsultants.com\/blog\/favicons-pose-privacy-vulnerability-with-supercookies\/\",\"name\":\"Favicons Pose Privacy Vulnerability With Supercookies - 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