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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    1. Brian Campbell‏ @__b_c 19 Aug 2018
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      Replying to @__b_c @RichFelker

      adoption and deployment at large likely hinges on the browser supporting it

      1 reply 0 retweets 0 likes
    2. Tavis Ormandy‏Verified account @taviso 21 Aug 2018
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      Replying to @__b_c @RichFelker

      But you dodged Rich's main point, it has to be an attack that can't just be exploited using the same vector you used to get the cookie, right? Subdomain takeover is the first example I've heard that works, but that's pretty niche, you have to admit?

      4 replies 0 retweets 2 likes
    3. Brian Campbell‏ @__b_c 22 Aug 2018
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      Replying to @taviso @RichFelker

      didn't mean to dodge so much as try to diplomatically say that I agree that there some limitations to the value prop around the browser/cookie protections but that there are other use cases, like SSO and native OAuth/API, that can benefit

      1 reply 0 retweets 1 like
    4. Brian Campbell‏ @__b_c 22 Aug 2018
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      Replying to @__b_c @taviso @RichFelker

      and that even when there are other attack vectors, I believe there's still value in enabling a cookie to be bound to a client generated asymmetric key because it does prevent the cookie from being used successfully in a different context without also getting the key

      1 reply 0 retweets 1 like
    5. Tavis Ormandy‏Verified account @taviso 22 Aug 2018
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      Replying to @__b_c @RichFelker

      Sure, it can (depending on if backed by hardware) prevent cookie from being used on another machine...but what attack are you imagining that can't be executed from the compromised machine instead? This is my main sticking point.

      2 replies 0 retweets 2 likes
    6. Brian Campbell‏ @__b_c 22 Aug 2018
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      Replying to @taviso @RichFelker

      stealing cookie from a workstation left unlocked for a couple minutes while someone gets coffee

      2 replies 0 retweets 0 likes
    7. Yvan Boily‏ @ygjb 22 Aug 2018
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      Replying to @__b_c @taviso @RichFelker

      wait, the premise of the attack is that you have local, authenticated access for the time needed to steal a cookie, and that is the attack you hope to protect against with a browser feature?

      1 reply 0 retweets 2 likes
    8. Brian Campbell‏ @__b_c 22 Aug 2018
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      Replying to @ygjb @taviso @RichFelker

      it's an example

      2 replies 0 retweets 0 likes
    9. Yvan Boily‏ @ygjb 22 Aug 2018
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      Replying to @__b_c @taviso @RichFelker

      Is there a more practical one? It's unreasonable to expect the browser to protect against this type of attack. The hardware and OS should, and the user failed to close the loop by locking the device. This is a game over scenario on almost any platform.

      1 reply 0 retweets 1 like
    10. Brian Campbell‏ @__b_c 22 Aug 2018
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      Replying to @ygjb @taviso @RichFelker

      It's the browser supporting features that allow a site to protect against it. And against replay after any leakage (log files for example) that's more passive and isn't a direct vector into the machine. And those kinds of things do happen.

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 22 Aug 2018
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      Replying to @__b_c @ygjb @RichFelker

      Yeah, slightly reducing the impact of logfiles leaking (if they contained unredacted cookies - doesn't help if passwords or PII is in there, I think that's more common cookies leaking, e.g. apfs) seems like the first valid attack I've heard. You have to admit it's not strong?

      10:52 AM - 22 Aug 2018
      0 replies 0 retweets 0 likes

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