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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. P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡‏ @pwnallthethings Apr 24

      P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡ Retweeted Kevin Beaumont

      This is a pretty big deal, not so much that a few crypto currency users got robbed, but as a reminder that HTTPS doesn't defend against sustained global DNS hijackshttps://twitter.com/GossiTheDog/status/988816808563093504?s=19 …

      P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡ added,

      Kevin BeaumontVerified account @GossiTheDog
      I wrote about BGP DNS hijack https://doublepulsar.com/hijack-of-amazons-internet-domain-service-used-to-reroute-web-traffic-for-two-hours-unnoticed-3a6f0dda6a6f …
      Show this thread
      8 replies 199 retweets 300 likes
      Show this thread
    2. P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡‏ @pwnallthethings Apr 24

      Perhaps worth unpacking this: The attack here was against BGP, which allowed the hackers to intercept network traffic at scale. The traffic they captured allowed them to briefly redirect MyEtherWallet,com to a site they controlled.

      2 replies 15 retweets 50 likes
      Show this thread
    3. P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡‏ @pwnallthethings Apr 24

      The attackers then did a dumb thing, which is they served a fake HTTPS certificate, so people's browsers noticed, and folks who clicked through the warning lost their money. (HTTPS certificate warnings are there for a reason)

      4 replies 20 retweets 66 likes
      Show this thread
    4. P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡‏ @pwnallthethings Apr 24

      But the attackers could have done a smarter thing: so far as HTTPS certificate providers are concerned, they were then in control of MyEtherWallet,com. They could have used LetsEncrypt (or someone else) to issue a live HTTPS cert for it, and browsers would have seen it as valid.

      7 replies 20 retweets 74 likes
      Show this thread
    5. P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡‏ @pwnallthethings Apr 24

      This is a bit of a problem. Because BGP is unauthenticated, so this would be an unauthenticated hijack of a HTTPS website that your browser won't notice. A BGP hijack shouldn't break HTTPS, and now we all need to go away and think how to make sure this doesn't happen again.

      12 replies 25 retweets 106 likes
      Show this thread
      Rich Felker‏ @RichFelker Apr 24
      Replying to @pwnallthethings

      BGP obviously needs to be deprecated in favor of an authenticated (via PKI) version of it.

      11:01 AM - 24 Apr 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Josiah Worcester‏ @pikhq Apr 24
          Replying to @RichFelker @pwnallthethings

          This also shows some of the importance of DNSSEC. I don't think you could get a false cert with DNSSEC. (unless some CAs don't check that) Shame end user DNSSEC adoption is miniscule.

          2 replies 0 retweets 3 likes
        3. P̵̛wn̷̕̕ A̶͡ll͜͝͝ T̡̛̕h̷̶̀͠͡e̷̵̶̷ T̵͜͢h̸̸́͟i̕ng͝s͡‏ @pwnallthethings Apr 24
          Replying to @pikhq @RichFelker

          DNSSEC solves some (but not all) of this problems with the trade-off of introducing lots of new problems and making other weaknesses much worse. (see also: https://sockpuppet.org/blog/2015/01/15/against-dnssec/ …)

          2 replies 0 retweets 2 likes
        4. Josiah Worcester‏ @pikhq Apr 24
          Replying to @pwnallthethings @RichFelker

          I'm not sure that's a good source: it starts off with "DNSSEC doesn't solve any problems because it doesn't solve the following problems" and then goes on to "DNSSEC does the following thing that it doesn't"

          1 reply 0 retweets 1 like
        5. Josiah Worcester‏ @pikhq Apr 24
          Replying to @pikhq @pwnallthethings @RichFelker

          The actual problems pointed out in there are valid, but some of its critiques are more or less irrelevant (really, bringing up DANE as a criticism of DNSSEC?)

          1 reply 0 retweets 1 like
        6. Josiah Worcester‏ @pikhq Apr 24
          Replying to @pikhq @pwnallthethings @RichFelker

          Relevant issues I see from there: weak crypto, hard to adopt, offers significant footguns. Irrelevant: the rest of that article.

          0 replies 0 retweets 2 likes
        7. End of conversation

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