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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. 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
    2. Rich Felker‏ @RichFelker Aug 19
      Replying to @RichFelker @__b_c

      Sharing credentials is a 101-level fail...

      1 reply 0 retweets 1 like
    3. 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
    4. 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
    5. 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
    6. 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
    7. 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
    8. Rich Felker‏ @RichFelker Aug 21
      Replying to @taviso @__b_c

      Rich Felker Retweeted hanno

      I think subdomain takeover is actually a much bigger threat than many ppl realize. IIRC @hanno has some nice work on this. Seehttps://twitter.com/hanno/status/1021350234117599234 …

      Rich Felker added,

      hanno @hanno
      Reported a subdomain takeover vuln to @Razer via their @Hacker0x01 program. After quite a while they now closed it as fixed. Except... http://pipe.mobileservices.razerzone.com/ 
      Show this thread
      2 replies 0 retweets 2 likes
    9. Tavis Ormandy‏Verified account @taviso Aug 21
      Replying to @RichFelker @__b_c @hanno

      It's a real attack for sure, but.... Is token binding the correct solution? It really feels like "no" to me, but maybe there's a convincing argument I haven't heard.

      2 replies 0 retweets 1 like
    10. Rich Felker‏ @RichFelker Aug 21
      Replying to @taviso @__b_c @hanno

      The right solution is not using wildcard-scoped cookies and instead doing SSO-like cross-subdomain auth only in one direction. But this is heavy retrofitting. I think the idea is that token binding provides a lazy fix...

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Aug 21
      Replying to @RichFelker @taviso and

      But my impression is that token binding is more about building/fitting into a Windows-AD-like ecosystem and being a nuisance against exercising control over your own auth tokens than about improving security.

      5:21 PM - 21 Aug 2018
      • 1 Like
      • Tavis Ormandy
      0 replies 0 retweets 1 like

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