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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. Stephen Checkoway‏ @stevecheckoway Sep 28

      Note, just because you’ve been signed out of Facebook does not mean the threat has passed. If you use Facebook to log in to any other site, those are all potentially still compromised.

      2 replies 37 retweets 39 likes
      Show this thread
    2. Stephen Checkoway‏ @stevecheckoway Sep 28

      The issue is that an attacker who compromises your FB account can log in to all of the sites where you use FB as an SSO provider and they remain logged in until their cookie expires (or is expired by the site).

      1 reply 13 retweets 10 likes
      Show this thread
    3. Stephen Checkoway‏ @stevecheckoway Sep 28

      Any site operator that allows FB to act as an identity provider (SSO provider) should expire all such session cookies. In our paper, we argue for a single sign-off mechanism to help remediate SSO provider compromise. https://www.usenix.org/conference/usenixsecurity18/presentation/ghasemisharif …

      3 replies 60 retweets 70 likes
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    4. Rich Felker‏ @RichFelker Sep 28
      Replying to @stevecheckoway

      As an aside, using Facebook for SSO seems like an awful idea. It's both giving FB additional data about you, and potentially compromising some of your FB profile to the site you're logging in to, at least allowing them to link you to a FB identity.

      1 reply 1 retweet 2 likes
    5. Stephen Checkoway‏ @stevecheckoway Sep 28
      Replying to @RichFelker

      I’m not sure I have an opinion about FB, but I use GitHub as an IdP for several sites (travis, appveyor, macports, etc). It _is_ convenient.

      1 reply 0 retweets 5 likes
      Rich Felker‏ @RichFelker Sep 28
      Replying to @stevecheckoway

      Yes, SSO/identity-provider is convenient. But FB makes a really really bad choice of one. I would go so far as to say it's irresponsible for a site to allow users to use FB as their SSO/identity provider.

      4:27 PM - 28 Sep 2018
      • 1 Retweet
      • 2 Likes
      • Christoph Burschka Advait Marathe OpenUARK
      2 replies 1 retweet 2 likes
        1. New conversation
        2. Stephen Checkoway‏ @stevecheckoway Sep 28
          Replying to @RichFelker

          What about Google? I believe those are the two largest IdPs.

          2 replies 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Sep 28
          Replying to @stevecheckoway

          Google is getting worse too, depending on which of their services and products you use. But I feel like supporting Google as SSO is reasonable because some people use it in ways that don't expose huge parts of their lives to Google.

          1 reply 0 retweets 4 likes
        4. Rich Felker‏ @RichFelker Sep 28
          Replying to @RichFelker @stevecheckoway

          On the other hand, if you're on Facebook, you're probably using it in ways that reveal your entire network of relationships to other people and lots of private aspects of your life. Unlike Google it doesn't have any purpose beyond that.

          1 reply 0 retweets 3 likes
        5. 1 more reply
        1. New conversation
        2. Sean Cassidy‏ @sean_a_cassidy Sep 29
          Replying to @RichFelker @stevecheckoway

          why?

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Sep 29
          Replying to @sean_a_cassidy @stevecheckoway

          See replies.

          0 replies 0 retweets 0 likes
        4. End of conversation

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