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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

Tweets

Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

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    1. Yehuda Katz  🥨‏Verified account @wycats Jan 3

      Am I reading this correctly? The Chrome team believes that regular GET requests are now CSRF vectors due to the disclosed attacks? If so, that has wide ranging implications on using links on the web. https://www.chromium.org/Home/chromium-security/ssca …pic.twitter.com/LeiEhnr7K0

      35 replies 519 retweets 683 likes
      Show this thread
    2. Manuel Strehl‏ @m_strehl Jan 3
      Replying to @wycats

      Wasn't that part of what CORS should address? Or put another way, if the client let's a random script access JSON loaded in an <img>, the client is doing shit, isn't it?

      1 reply 0 retweets 5 likes
      Yehuda Katz  🥨‏Verified account @wycats Jan 3
      Replying to @m_strehl

      That was the assumption, but these are new attacks that invalidate those assumptions.

      11:19 PM - 3 Jan 2018
      • 10 Likes
      • Nicola Ammon_Ra Jaden Geller pub unsafe { Esteban Küber; } Graziella Finch yami Jordan Hawker Michael Simons Manuel Strehl
      1 reply 0 retweets 10 likes
        1. New conversation
        2. Manuel Strehl‏ @m_strehl Jan 3
          Replying to @wycats

          OK, I'm starting to getting to grips with that attack. Mozilla posted about it, too: https://blog.mozilla.org/security/2018/01/03/mitigations-landing-new-class-timing-attack/ …

          1 reply 5 retweets 20 likes
        3. Anne van Kesteren‏ @annevk Jan 4
          Replying to @m_strehl @wycats

          Note that CORS was never a defense. The same-origin policy is, but it has known holes such as this that could always lead to some information exposure.

          1 reply 0 retweets 3 likes
        4. Yehuda Katz  🥨‏Verified account @wycats Jan 4
          Replying to @annevk @m_strehl

          But now it can lead to total information disclosure. We might want to close the prerender hole in Same-Site lax mode. If someone really wants that feature, maybe we need a "actually top level nav only for real" mode.

          1 reply 0 retweets 4 likes
        5. Anne van Kesteren‏ @annevk Jan 4
          Replying to @wycats @m_strehl

          Yes, it sounds pretty bad indeed. I hope @mikewest is on it, assuming you’re referring to cookies.

          1 reply 0 retweets 0 likes
        6. Mike West‏ @mikewest Jan 4
          Replying to @annevk @wycats @m_strehl

          With the caveat that I'm still on vacation, and haven't followed internal threads, my understanding is that Site Isolation will be pushing prerendering into a distinct process in Chrome, which is a good mitigation for this class of attack.

          1 reply 0 retweets 14 likes
        7. Mike West‏ @mikewest Jan 4
          Replying to @mikewest @annevk and

          (In fact, that might already be the case in stable, now that we're shipping PlzNavigate. @nasko will know.)

          0 replies 0 retweets 0 likes
        8. End of conversation

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