{"id":2394,"date":"2018-06-01T12:24:00","date_gmt":"2018-06-01T12:24:00","guid":{"rendered":"http:\/\/8e6d0df1-9662-40d2-b3fb-d2ffb08628d8"},"modified":"2018-06-01T12:24:00","modified_gmt":"2018-06-01T12:24:00","slug":"chrome-firefox-css3-flaw-may-have-let-attackers-grab-facebook-user-data","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/chrome-firefox-css3-flaw-may-have-let-attackers-grab-facebook-user-data\/","title":{"rendered":"Chrome, Firefox CSS3 flaw may have let attackers grab Facebook user data"},"content":{"rendered":"<p><em>Video: Windows Chrome users targeted in tech-support scam that takes hold and won&#8217;t let go.<\/em><\/p>\n<div class=\"relatedContent alignRight\">\n<h3 class=\"heading\"><span class=\"int\">More security news<\/span><\/h3>\n<\/div>\n<p>Chrome and Firefox recently received patches for a bug that allowed attackers to reveal Facebook usernames, profile pictures and Likes when users visited an attack site.<\/p>\n<p>The bug is caused by the way Chrome and Firefox implemented a feature of Cascading Style Sheets (CSS) called &#8216;mix-blend-mode&#8217;, introduced to the CSS3 standard in 2016.<\/p>\n<p>The CSS3 feature in browsers had a side-channel vulnerability that leaked visual content, such as Facebook profiles images, from cross-origin iframes.<\/p>\n<p>Ruslan Habalov, a security researcher at Google, <a href=\"https:\/\/www.evonide.com\/side-channel-attacking-browsers-through-css3-features\/#Bug_Discovery\" target=\"_blank\">explained<\/a> in a blog on Thursday that an attacker could set up a malicious website that exploits the browser bug to de-anonymize Facebook users simply by having them visit the site while logged into Facebook.<\/p>\n<p>Habalov, who discovered the bug with security researcher Dario Wei\u00dfer, notes that their demonstration focused on Facebook, but the flaw affects many other sites with &#8216;endpoints&#8217; such as the Facebook Login button that can be embedded in an iframe.<\/p>\n<p><strong>See:<\/strong> <a href=\"https:\/\/www.techrepublic.com\/resource-library\/whitepapers\/special-report-cybersecurity-in-an-iot-and-mobile-world-free-pdf\/\" target=\"_blank\">Special report: Cybersecurity in an IoT and mobile world (free PDF)<\/a><\/p>\n<section class=\"sharethrough-top\" data-component=\"medusaContentRecommendation\" data-medusa-content-recommendation-options=\"{&quot;promo&quot;:&quot;promo_ZD_recommendation_sharethrough_top_in_article_desktop&quot;,&quot;spot&quot;:&quot;dfp-in-article&quot;}\">\n<\/section>\n<p>Wei\u00dfer <a href=\"https:\/\/arstechnica.com\/information-technology\/2018\/05\/chrome-and-firefox-leaks-let-sites-steal-visitors-facebook-names-profile-pics\/\" target=\"_blank\">explained<\/a> how the attack worked to Ars Technica. The attack uses an iframe that links to these Facebook endpoints and then uses the mix-blend-mode feature to infer visual content from the targeted iframe while rendering its elements.<\/p>\n<p>&#8220;We cannot access the iframe&#8217;s content directly. However, we can put overlays over the iframe that do some kind of graphical interaction with the underlying pixels,&#8221; Wei\u00dfer said.<\/p>\n<p>&#8220;Since these overlays are controlled by the attacker&#8217;s site, it is possible to measure how long these graphical interactions take.&#8221;<\/p>\n<p>Wei\u00dfer added that some of the mix-blend-modes require a variable amount of time based on the color of the underlying pixel.<\/p>\n<p>&#8220;If the color of the tested pixel has color X, the rendering process can take longer than for color Y. The leak allows [us to] determine the color of individual pixels. We don&#8217;t leak the HTML, but the visual contents of the targeted iframe.&#8221;<\/p>\n<p>Google actually rolled out a fix in Chrome 63 late last year, while Mozilla patched it in Firefox 60 two weeks ago. Meanwhile Internet Explorer and Microsoft Edge were not vulnerable because they didn&#8217;t support mix-blend-mode. Safari, for some unknown reason, was also not affected.<\/p>\n<p>The researchers reported the issue to Facebook, too. However, the social network determined that it was impossible to patch because it would have required removing all its endpoints.<\/p>\n<p><span class=\"img aspect-set\"><img decoding=\"async\" src=\"https:\/\/zdnet1.cbsistatic.com\/hub\/i\/r\/2018\/06\/01\/8900dd12-03a4-413d-9ed5-737c1e5aeb4a\/resize\/770xauto\/1d16d009f152e63496f3fa5c1feb44b7\/ruslanhabalovcssbug.jpg\" class=\"\" alt=\"ruslanhabalovcssbug.jpg\" height=\"auto\" width=\"770\"\/><\/span><\/p>\n<p><span class=\"caption\">Researchers demonstrate leaking the Facebook username, left, and profile picture, right, out of an embedded Facebook Iframe.<\/span><\/p>\n<p><span class=\"credit\">Image: Ruslan Habalov<\/span><\/p>\n<h3>Previous and related coverage<\/h3>\n<p><strong><a href=\"https:\/\/www.zdnet.com\/article\/chrome-67-is-out-password-free-logins-get-closer-plus-bug-fixes-better-ar-vr-support\/\">Chrome 67 is out: Password-free logins get closer, plus bug fixes, better AR-VR support<\/a><\/strong><\/p>\n<p>Google&#8217;s Chrome 67 has new APIs for augmented reality and virtual reality, as well as support for WebAuthn spec.<\/p>\n<p><strong><a href=\"https:\/\/www.zdnet.com\/article\/google-chrome-can-now-spot-brand-new-phishing-pages\/\">Google Chrome can now spot even brand new phishing pages<\/a><\/strong><\/p>\n<p>Google has rolled out two new tools to combat phishing, and upped Gmail security.<\/p>\n<p><strong><a href=\"https:\/\/www.zdnet.com\/article\/google-chrome-is-backing-away-from-public-key-pinning-and-heres-why\/\">Google: Chrome is backing away from public key pinning, and here&#8217;s why<\/a><\/strong><\/p>\n<p>Google wrote the HTTP public key pinning standard but now considers the web security measure harmful.<\/p>\n<p>READ MORE <a href=\"https:\/\/www.zdnet.com\/article\/chrome-firefox-css3-flaw-may-have-let-attackers-grab-facebook-user-data\/#ftag=RSSbaffb68\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Researchers reveal a tricky technique that uses a CSS3 feature to let attackers recover Facebook user data.<br \/>\nREAD MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":2395,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[62],"tags":[],"class_list":["post-2394","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zdnet-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chrome, Firefox CSS3 flaw may have let attackers grab Facebook user data 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" 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