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dguido's profile
Dan Guido
Dan Guido
Dan Guido
@dguido

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Dan Guido

@dguido

CEO @trailofbits, organizer @EmpireHacking, director @hack_secure. Open DMs.

Brooklyn, NY
trailofbits.com
Joined April 2008

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    1. Bob Lord‏ @boblord Sep 21

      Security pros: If I run a fully patched OS, a fully patched browser, run HTTPS Everywhere set to “Block all unencrypted requests”, and run uBlock Origin, what are my practical risks when connecting to an unknown and possibly malicious wifi access point? (links welcome!)

      70 replies 57 retweets 194 likes
    2. Ryan Naraine‏ @ryanaraine Sep 21
      Replying to @boblord

      Totally unrelated to your Qs, but assuming a "fully patched OS" isn't practical or wise.

      1 reply 1 retweet 2 likes
    3. Bob Lord‏ @boblord Sep 21
      Replying to @ryanaraine

      Meaning most people don't patch promptly? If so, agreed. I assume you do, however. Am I overly optimistic? 🤣

      1 reply 0 retweets 0 likes
    4. Ryan Naraine‏ @ryanaraine Sep 21
      Replying to @boblord

      Not trying to derail your thread, but staying ahead of patching third-party programs (especially those without automatic-updates) is an impossible task, even for security pros. A "fully patched" OS assumes everything above the OS layer is also patched

      4 replies 0 retweets 5 likes
    5. Pedro Guizeline‏ @pguizeline Sep 21
      Replying to @ryanaraine @boblord

      .@AlgoVPN could help!

      1 reply 0 retweets 0 likes
      Dan Guido‏ @dguido Sep 21
      Replying to @pguizeline @ryanaraine and

      Hey Bob, the scenario you outlined limits most risks I can think of, however, the macOS captive portal pop-up is always a point of concern for me. It loads untrusted content under direct control of the (malicious) router into a vanilla Safari frame.

      11:56 AM - 21 Sep 2018
      • 2 Likes
      • Ryan Naraine Bob Lord
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Bob Lord‏ @boblord Sep 21
          Replying to @dguido @pguizeline and

          Great point. Any links we should read up on?

          1 reply 0 retweets 0 likes
        3. Dan Guido‏ @dguido Sep 21
          Replying to @boblord @pguizeline and

          No, not really, that risk is fully explained by my short description above. You're forced to browse to a website under control of the malicious party in Safari. I'm not sure if the seatbelt policy is identical between captive portal vs normal Safari.

          1 reply 0 retweets 1 like
        4. jamshid‏ @jamshid Sep 22
          Replying to @dguido @boblord and

          Okay so that requires education, treat Wi-Fi login screen like a random website, never enter e.g. Facebook password even if it looks like FB? Relying on browser auto-fill helps. There was this attack, but only affected new devices on first wifi connection.https://dailydot.com/debug/macos-security-bug-blackhat/ …

          1 reply 0 retweets 1 like
        5. jamshid‏ @jamshid Sep 22
          Replying to @jamshid @dguido and

          jamshid Retweeted Binni Shah

          Would be good if OS disallowed a captive portal to include a link to a CA certificate. They’re a little too easy to install, need loud and clear warning since they allow HTTPS intercept. To mitigate, browsers should pin certs or warn when they’ve changed?https://twitter.com/binitamshah/status/1043504147444781056?s=21 …

          jamshid added,

          Binni Shah @binitamshah
          1) Four Ways to Bypass iOS SSL Verification and Certificate Pinning : https://blog.netspi.com/four-ways-to-bypass-ios-ssl-verification-and-certificate-pinning/ … 2) Four Ways to Bypass Android SSL Verification and Certificate Pinning : https://blog.netspi.com/four-ways-bypass-android-ssl-verification-certificate-pinning/ … cc @NetSPI pic.twitter.com/25jnXOPtp7
          0 replies 0 retweets 0 likes
        6. End of conversation

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