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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Brian Campbell‏ @__b_c Aug 17

      will you join me in my (probably feeble) attempt to talk the good peoples at Chrome out of removing Token Binding support? https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/OkdLUyYmY1E … it's not like the future of web security is at stake or anything... #PleaseKeepTokenBindingInChrome #TokenBinding

      8 replies 59 retweets 91 likes
      Show this thread
    2. Rich Felker‏ @RichFelker Aug 18
      Replying to @__b_c

      What actual problem are token bindings intended to solve?

      1 reply 0 retweets 2 likes
    3. Brian Campbell‏ @__b_c Aug 19
      Replying to @RichFelker

      token binding enables cookies/tokens to be bound to a key pair generated and held by the client and that binding prevents cookies/tokens from being used successfully if stolen

      1 reply 0 retweets 3 likes
    4. Rich Felker‏ @RichFelker Aug 19
      Replying to @__b_c

      But what is the likely vector for stealing the token that doesn't also give you the key?

      2 replies 0 retweets 1 like
    5. Brian Campbell‏ @__b_c Aug 19
      Replying to @RichFelker

      a subdomain takeover on a site that uses a widely scoped cookie for an authenticated session, for example, which happened to Uber last year.

      1 reply 0 retweets 6 likes
    6. Brian Campbell‏ @__b_c Aug 19
      Replying to @__b_c @RichFelker

      cases where multiple apps/servers are authorized with the same credential/token but aren't or shouldn't be trusted not to replay the token against other services

      1 reply 0 retweets 1 like
    7. Brian Campbell‏ @__b_c Aug 19
      Replying to @__b_c @RichFelker

      coffee shop MITM

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker Aug 19
      Replying to @__b_c

      Coffee shop MITM is precluded by proper implementation of https by browser. Don't need another browser feature to deal with it.

      1 reply 0 retweets 5 likes
    9. Rich Felker‏ @RichFelker Aug 19
      Replying to @RichFelker @__b_c

      Subdomain takeover is a real risk most developers and even many security reviewers aren't aware of, but if you are aware enough to try to mitigate you should properly scope cookies...

      1 reply 0 retweets 3 likes
      Rich Felker‏ @RichFelker Aug 19
      Replying to @RichFelker @__b_c

      Sharing credentials is a 101-level fail...

      6:17 AM - 19 Aug 2018
      • 1 Like
      • Mitchel Lewis👨🏻‍💻
      1 reply 0 retweets 1 like
        1. New conversation
        2. Rich Felker‏ @RichFelker Aug 19
          Replying to @RichFelker @__b_c

          So subdomain takeover looks like the big one, and whether the tradeoffs of token binding are worth it seems to depend on how hard it is to fix poorly scoped cookies.

          1 reply 0 retweets 1 like
        3. Brian Campbell‏ @__b_c Aug 19
          Replying to @RichFelker

          there are, of course, all kinds of protections available to prevent cookie theft. Token binding is unique in that it can prevent use after theft rather than trying to stop the theft itself. Both have value. Defence in depth etc. Token Binding also ...

          1 reply 0 retweets 0 likes
        4. Brian Campbell‏ @__b_c Aug 19
          Replying to @__b_c @RichFelker

          ... can apply to things like OAuth and SSO tokens, which don't necessarily have the same characteristics as cookies. The browser case is maybe less compelling b/c of other cookie protections. But it's still useful IMHO. And, for better or worse, ...

          1 reply 0 retweets 1 like
        5. Brian Campbell‏ @__b_c Aug 19
          Replying to @__b_c @RichFelker

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

          1 reply 0 retweets 0 likes
        6. Tavis Ormandy‏Verified account @taviso Aug 21
          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 3 likes
        7. Brian Campbell‏ @__b_c Aug 22
          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
        8. Brian Campbell‏ @__b_c Aug 22
          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 0 likes
        9. Tavis Ormandy‏Verified account @taviso Aug 22
          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
        10. 1 more reply

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