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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. buherator‏ @buherator Apr 27
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      Aside of the fact that security questions are the worst idea since Greedo shooting first, how is a custom picture supposed to help with my account security @Okta?pic.twitter.com/LUOoEWbkCJ

      5 replies 2 retweets 9 likes
      Show this thread
    2. Wesley McGrew‏ @McGrewSecurity Apr 27
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      Replying to @buherator @okta

      The idea is that a phishing site (especially an untargeted one) wouldn't know which image to present to you

      2 replies 0 retweets 2 likes
    3. Can Bölük‏ @_can1357 Apr 27
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      Replying to @McGrewSecurity @buherator @okta

      And that you somehow magically remember whether you chose the yellow flower or the green flower.

      1 reply 0 retweets 5 likes
    4. Infosec Charlatan‏ @Helter27 Apr 27
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      Replying to @_can1357 @McGrewSecurity and

      If uou use it regularly, you will notice the change if you are paying attention. You could also store it as a note in your pw manager.

      2 replies 0 retweets 0 likes
    5. Can Bölük‏ @_can1357 Apr 27
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      Replying to @Helter27 @McGrewSecurity and

      No security concerned user will fall for a pishing site nor waste time remembering it, and others won't care eitherway.

      2 replies 0 retweets 0 likes
    6. Infosec Charlatan‏ @Helter27 Apr 27
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      Replying to @_can1357 @McGrewSecurity and

      I disagree with most of this. But even if you are correct, at worst it's harmless.

      1 reply 0 retweets 1 like
    7. buherator‏ @buherator Apr 27
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      Replying to @Helter27 @_can1357 and

      It's extra complexity (technical and mental), and is also an indicator of how security controls are designed (in this case: "bring the kitchen sink!").

      1 reply 0 retweets 0 likes
    8. Wesley McGrew‏ @McGrewSecurity Apr 27
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      Replying to @buherator @Helter27 and

      I don't think it's all that complicated to have a chance at catching/preventing phishing sites by a user not seeing the picture they normally see whenever they log in.

      2 replies 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso Apr 27
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      Replying to @McGrewSecurity @buherator and

      How does it work, when you enter your username a special image is displayed? The phishing site can just POST the username you enter and grab the right image, no? Not really sure what it's supposed to prevent...

      7:14 AM - 27 Apr 2020
      • 1 Like
      • buherator
      4 replies 0 retweets 1 like
        1. New conversation
        2. DJ  🐲 (๑˃̵ᴗ˂̵)و  🃏  🎹 🎛‏ @dj_ir0ngruve Apr 27
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          Replying to @taviso @McGrewSecurity and

          One thing it does is it helps prevent you locking someone else’s account due to having similar usernames.

          1 reply 0 retweets 1 like
        3. Tavis Ormandy‏Verified account @taviso Apr 27
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          Replying to @dj_ir0ngruve @McGrewSecurity and

          Not really a "security" feature though! Kind of an anti-feature, to workaround a DoS that people trigger accidentally 😂

          1 reply 0 retweets 1 like
        4. 2 more replies
        1. New conversation
        2. m̿̃͐̿̃̔̚ỏ͆͐̑͒ͣ̀̐s̿̋ͤͥͤŝ̇̊̎̓y̓ͪ͌ẗ̀̚rͥ́̀e̅̆͊ͥ̚̚es‏ @djbyler Apr 27
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          Replying to @taviso @McGrewSecurity and

          It’s supposed to load the “security image” after you enter your username only from a known browser. They give you a warning if you are connecting from a “new browser”. I haven’t checked how the mechanics work.pic.twitter.com/ZzrVTtTf3u

          1 reply 0 retweets 2 likes
        3. buherator‏ @buherator Apr 27
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          Replying to @djbyler @taviso and

          This is enlightening, thank you! (not considering psychological factors) this basically turns this into a cat&mouse game, right (RE, start selling phish kit, detect kit, mitigation is deployed, goto 10)?

          1 reply 0 retweets 0 likes
        4. 2 more replies
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        2. Infosec Charlatan‏ @Helter27 Apr 27
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          Replying to @taviso @McGrewSecurity and

          Sure, but that makes the Phishing attack harder to employ. Also, that gives the site SOC at least an ability to ID/mitigate credential theft, as they would have data on which IPs accessed the login pages.

          1 reply 0 retweets 1 like
        3. Tavis Ormandy‏Verified account @taviso Apr 27
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          Replying to @Helter27 @McGrewSecurity and

          I dunno, I don't know how to write an audio driver but I'm still listening music - I just bought one from someone who did. Don't attackers just buy a phishing kit that does it all for them?

          1 reply 0 retweets 0 likes
        4. 3 more replies
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        2. Wesley McGrew‏ @McGrewSecurity Apr 27
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          Replying to @taviso @buherator and

          Wouldn't the server get a referer of the phishing site URL?

          1 reply 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso Apr 27
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          Replying to @McGrewSecurity @buherator and

          No, you can send any referer you want or none at all.

          2 replies 0 retweets 1 like
        4. 2 more replies

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