A New Attack Can Unmask Anonymous Users On Any Major Browser

An anonymous reader quotes a report from Wired: [R]esearchers from the New Jersey Institute of Technology are warning this week about a novel technique attackers could use to de-anonymize website visitors and potentially connect the dots on many components of targets' digital lives. The findings (PDF), which NJIT researchers will present at the Usenix Security Symposium in Boston next month, show how an attacker who tricks someone into loading a malicious website can determine whether that visitor controls a particular public identifier, like an email address or social media account, thus linking the visitor to a piece of potentially personal data. When you visit a website, the page can capture your IP address, but this doesn't necessarily give the site owner enough information to individually identify you. Instead, the hack analyzes subtle features of a potential target's browser activity to determine whether they are logged into an account for an array of services, from YouTube and Dropbox to Twitter, Facebook, TikTok, and more. Plus the attacks work against every major browser, including the anonymity-focused Tor Browser. "If you're an average internet user, you may not think too much about your privacy when you visit a random website," says Reza Curtmola, one of the study authors and a computer science professor at NJIT. "But there are certain categories of internet users who may be more significantly impacted by this, like people who organize and participate in political protest, journalists, and people who network with fellow members of their minority group. And what makes these types of attacks dangerous is they're very stealthy. You just visit the website and you have no idea that you've been exposed." How this de-anonymization attack works is difficult to explain but relatively easy to grasp once you have the gist. Someone carrying out the attack needs a few things to get started: a website they control, a list of accounts tied to people they want to identify as having visited that site, and content posted to the platforms of the accounts on their target list that either allows the targeted accounts to view that content or blocks them from viewing it -- the attack works both ways. Next, the attacker embeds the aforementioned content on the malicious website. Then they wait to see who clicks. If anyone on the targeted list visits the site, the attackers will know who they are by analyzing which users can (or cannot) view the embedded content. [...] Complicated as it may sound, the researchers warn that it would be simple to carry out once attackers have done the prep work. It would only take a couple of seconds to potentially unmask each visitor to the malicious site -- and it would be virtually impossible for an unsuspecting user to detect the hack. The researchers developed a browser extension that can thwart such attacks, and it is available for Chrome and Firefox. But they note that it may impact performance and isn't available for all browsers.

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