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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Matthew Green‏ @matthew_d_green 15 Oct 2018
      • Report Tweet
      • Report NetzDG Violation

      Has anyone empirically analyzed the actual threat from using public WiFi? That is: (1) how much useful (unencrypted) data is still available to a rogue AP, (2) how well these attacks could be executed by remote attackers?

      41 replies 73 retweets 225 likes
      Show this thread
    2. Will Dormann‏ @wdormann 15 Oct 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @matthew_d_green

      A number of years ago I looked into Android apps that use HTTPS, but fail to validate certificates. https://www.rsaconference.com/events/us15/agenda/sessions/1638/how-we-discovered-thousands-of-vulnerable-android … Things have gotten a bit better by now, but it's still a problem. These apps are why I'm not comfortable with public open WiFi.

      1 reply 0 retweets 6 likes
    3. Will Dormann‏ @wdormann 15 Oct 2018
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      Replying to @wdormann @matthew_d_green

      How many apps are on your phone? How confident are you that EVERY app, aside from your web browser I suppose, uses HTTPS properly? Or uses HTTPS at all (as opposed to HTTP).

      1 reply 0 retweets 2 likes
    4. Aaron Grattafiori‏ @dyn___ 15 Oct 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wdormann @matthew_d_green

      This is the real problem. From a browser MitM point of view, HSTS is the real killer, and any attack will have to also redirect to a different realistic DNS name. Captured portal "login please", might not have HSTS...

      1 reply 0 retweets 1 like
    5. Greg Tunink‏ @EMttyCUP 15 Oct 2018
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      Replying to @dyn___ @wdormann @matthew_d_green

      Are there any simple tools to review this without MitM oneself or using Wireshark on one's LAN? Or public, organized efforts to keep track of who's doing things well to nightmarishly bad (beyond HTTPS or not, since it's not black & white, more a range)? 🤔

      2 replies 1 retweet 0 likes
    6. Will Dormann‏ @wdormann 15 Oct 2018
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      • Report NetzDG Violation
      Replying to @EMttyCUP @dyn___ @matthew_d_green

      It's trivial to test apps yourself with CERT Tapioca.https://github.com/CERTCC/tapioca 

      3 replies 1 retweet 7 likes
      Will Dormann‏ @wdormann 16 Oct 2018
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      Replying to @wdormann @EMttyCUP and

      But while it's easy to test an app (given you have a compatible USB WiFi adapter), knowing which apps to trust requires that you have tested each app on your phone. Having just gone through the top 10 free Android apps, only one of them results in using unvalidated HTTPS by now.

      9:55 AM - 16 Oct 2018
      • 1 Like
      • Aaron Grattafiori
      0 replies 0 retweets 1 like

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