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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. Tavis Ormandy‏Verified account @taviso 15 Dec 2017
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      Everyone wants there to be simple answers in security, but sometimes there are no simple answers.

      30 replies 189 retweets 627 likes
    2. Justin Berman‏ @justinmberman 15 Dec 2017
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      Replying to @taviso @haroonmeer

      On the flip side, sometimes there are really simple answers that can address low hanging fruit. They just don’t feel as sexy. Example the comes to mind, 2FA.

      3 replies 0 retweets 4 likes
    3. Tavis Ormandy‏Verified account @taviso 16 Dec 2017
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      Replying to @justinmberman @haroonmeer

      Even then, it's not that simple. For example, SMS-2FA is basically worthless. U2F on the other hand, while not a panacea, is fantastic if implemented correctly.

      1 reply 0 retweets 3 likes
    4. Justin Berman‏ @justinmberman 16 Dec 2017
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      Replying to @taviso @haroonmeer

      I agree that you still have to do technical diligence in order to select a control, but U2F is pretty straightforward now? Either way, just implementing SOME 2FA meaningfully reduces a lot of risks.

      1 reply 0 retweets 0 likes
    5. Tavis Ormandy‏Verified account @taviso 16 Dec 2017
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      Replying to @justinmberman @haroonmeer

      I think we're on the same page about U2F, but if by "SOME 2FA" you mean "ANY 2FA", then I don't think we agree. Would you argue that SMS-2FA is better than nothing? If so, that's where we differ. I think it's at best, equal to nothing.

      1 reply 0 retweets 1 like
    6. Justin Berman‏ @justinmberman 16 Dec 2017
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      Replying to @taviso @haroonmeer

      Does the adversary set matter here? If you as a small company who models their adversaries as mostly using phishing to grab creds to Corp saas systems, they probably aren’t going to invest to be able to bypass SMS-2FA?

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 16 Dec 2017
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      Replying to @justinmberman @haroonmeer

      Yes, I agree that a rational attacker will calculate the cost of updating his PHP vs the expected increase in victim yield and *could* find it's not worth it. That's also true of making users type "banana" into a form field, which adds about as much security IMO 🙂

      9:48 AM - 16 Dec 2017
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      • Justin Berman
      1 reply 0 retweets 1 like
        1. Tavis Ormandy‏Verified account @taviso 16 Dec 2017
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          Replying to @taviso @justinmberman @haroonmeer

          We've already established that the attacker has the capability of stealing passwords, so any solution that involves giving the user more passwords is fundamentally flawed imo.

          0 replies 0 retweets 2 likes
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