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arturjanc's profile
Artur Janc
Artur Janc
Artur Janc
@arturjanc

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Artur Janc

@arturjanc

Making the web platform more secure and private, and managing part of @Google's Information Security Engineering team in my spare time.

Zurich, Switzerland
Joined February 2012

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    Artur Janc‏ @arturjanc Jan 22
    • Report Tweet

    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

    11:12 AM - 22 Jan 2020
    • 117 Retweets
    • 188 Likes
    • Jakub Vrána rahul chadda Sandor Szücs Yellow Flag Bour Abdelhadi Sebastian Neuner Jorge Hernández Cyber security talk Martin Hořeňovský
    6 replies 117 retweets 188 likes
      1. New conversation
      2. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        In a nutshell, Safari bases its anti-tracking approach not on a built-in, static list of domains, but on making a local decision about the sites that your browser recognizes as providers of third-party resources. [2/9]

        2 replies 0 retweets 11 likes
        Show this thread
      3. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        The first problem is that this requires building up a custom model of what sites are loaded in third-party contexts, which depends on your individual traffic and implicitly encodes information about your browsing history. [3/9]

        1 reply 0 retweets 14 likes
        Show this thread
      4. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        The second problem is that when the browser uses this model to change its behavior (e.g removes cookies or the `Referer' header from some requests), its underlying data gets exposed to any website (How, you ask? -> Section 1.2.1) [4/9]

        1 reply 1 retweet 14 likes
        Show this thread
      5. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        What you end up with is a personalized anti-tracking model baked into your browser. That model is not only a unique identifier, but also reveals information about sites you visited since last clearing browsing state. That's not great. [5/9]

        3 replies 3 retweets 16 likes
        Show this thread
      6. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        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]

        2 replies 2 retweets 10 likes
        Show this thread
      7. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        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]

        1 reply 8 retweets 28 likes
        Show this thread
      8. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        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]

        3 replies 1 retweet 18 likes
        Show this thread
      9. Artur Janc‏ @arturjanc Jan 22
        • Report Tweet

        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]

        1 reply 3 retweets 36 likes
        Show this thread
      10. End of conversation
      1. koto‏ @kkotowicz Jan 22
        • Report Tweet
        Replying to @arturjanc @empijei @we1x

        koto Retweeted Steven Englehardt

        In terms of technical details, https://twitter.com/s_englehardt/status/1220057551271645184 … has a good summary.

        koto added,

        Steven Englehardt @s_englehardt
        Excellent paper by @arturjanc et al. on the risks of on-device tracker classification. Specifically, they discuss how Safari's ITP can be abused to leak browsing history, leak search history, and perform denial of service attacks: https://arxiv.org/ftp/arxiv/papers/2001/2001.07421.pdf … [thread]
        Show this thread
        0 replies 3 retweets 9 likes
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      1. Tavis Ormandy‏Verified account @taviso Jan 22
        • Report Tweet
        Replying to @arturjanc @kkotowicz and

        Congrats everyone, really nice work.

        0 replies 0 retweets 17 likes
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