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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. Troy Hunt‏Verified account @troyhunt 6 Feb 2018
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      What's the correct minimum length for a password? 6 chars? 8? A number that isn't even? Here's what the big guys do (and why there's much more to it today than just length):https://www.troyhunt.com/how-long-is-long-enough-minimum-password-lengths-by-the-worlds-top-sites/ …

      25 replies 86 retweets 148 likes
    2. Joona Immonen‏ @rinorragi 6 Feb 2018
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      Replying to @troyhunt

      Joona Immonen Retweeted Tavis Ormandy

      About that 2FA. What is your opinion on SMS-2FA? @taviso was kind of harsh about it:https://twitter.com/taviso/status/942082082385182720 …

      Joona Immonen added,

      Tavis OrmandyVerified account @taviso
      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.
      3 replies 0 retweets 2 likes
    3. Troy Hunt‏Verified account @troyhunt 6 Feb 2018
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      Replying to @rinorragi @taviso

      It’s something in addition to a password alone so that’s good, the discussion then is how readily exploitable it is

      2 replies 0 retweets 3 likes
    4. Joona Immonen‏ @rinorragi 6 Feb 2018
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      Replying to @troyhunt @taviso

      I guess there is also a discussion about who you are trying to protect from and where do you live. Operators tend to be different around the globe. Also high profile players like you two might have different kind of concerns than regular users.

      1 reply 0 retweets 0 likes
    5. Joona Immonen‏ @rinorragi 6 Feb 2018
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      Replying to @rinorragi @troyhunt @taviso

      But back to original question. Would you invest on developing SMS-2FA and do you feel that it might give the user false sense of security?

      1 reply 0 retweets 0 likes
    6. Troy Hunt‏Verified account @troyhunt 6 Feb 2018
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      Replying to @rinorragi @taviso

      Yes, then no. SIM hijacking is very targeted and when you consider that in the context of common attacks like credential stuffing, it’s a big leap forward.

      3 replies 0 retweets 3 likes
    7. Tavis Ormandy‏Verified account @taviso 6 Feb 2018
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      Replying to @troyhunt @rinorragi

      The problem with SMS-2FA isn't "sim hijacking" - The issue is you're trying to solve the problem of an attacker who can steal passwords with a second password.

      2 replies 17 retweets 46 likes
    8. Seanie B.‏ @seanieb 6 Feb 2018
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      Replying to @taviso @troyhunt @rinorragi

      Which TOTP suffers from too. I still consider this and the "sim hijacking"* less important than the account life cycle issues @alexstamos highlights. Especially if you can just email support and convincingly claim you're locked out due to a new phone/lost @Yubico.

      3 replies 0 retweets 1 like
      Tavis Ormandy‏Verified account @taviso 6 Feb 2018
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      Replying to @seanieb @troyhunt and

      I did not claim TOTP is better, I do however claim U2F, while not a panacea, is better.

      6:15 AM - 6 Feb 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Seanie B.‏ @seanieb 6 Feb 2018
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          Replying to @taviso @troyhunt and

          Agreed. It's better technically. But in practice some claim it's inferior due to the account recovery process if a use loses their u2f key. Support orgs are programmed to set a low bar for recovery because loss occurs so frequently.

          1 reply 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso 6 Feb 2018
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          Replying to @seanieb @troyhunt and

          That issue exists whether U2F is implemented or not. It also doesn't solve the problem of malware, vulnerability exploitation, or other social engineering attacks. It's pretty much just phishing.

          1 reply 0 retweets 0 likes
        4. 1 more reply
        1. Mesh3L‏ @0x_saudi 16 Jun 2019
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          Replying to @taviso @seanieb and

          https://www.yubico.com/support/security-advisories/ysa-2019-02/ …

          0 replies 0 retweets 0 likes
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