Earlier today we published the details of a set of vulnerabilities in Safari's Intelligent Tracking Prevention privacy mechanism: https://arxiv.org/abs/2001.07421 . They are... interesting. [1/9]
@kkotowicz @empijei @we1x
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As far as mitigations go, there are definitely useful things the browser can do to address such leaks (and Safari has done them: https://webkit.org/blog/9661/preventing-tracking-prevention-tracking/ …). But completely fixing this is hard. [6/9]
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There is an important and somewhat unexpected lesson in all of this. It's that if you alter browser behavior based on locally gathered data, then if your changes have web-observable consequences, you're going to have a bad time. [7/9]
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This is a concern not just for Safari and ITP, but for all other anti-tracking proposals. For example, Chrome's Privacy Budget idea will have to grapple with the same kinds of issues as it develops. [8/9]
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One last thing: it's clear that Apple is trying to do the right thing and the WebKit folks we've interacted with care deeply about privacy. We hope that these results will help Safari & guide other browser vendors in the long run. [fin]
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