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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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    Dan Guido‏ @dguido May 14

    Before anyone freaks out about "efail", realize that using it would be: 1) extremely easy to detect 2) archived in your target's email As an attacker, I could not care less about this technique. It's intellectually neat, but operationally stupid. https://efail.de/efail-attack-paper.pdf …

    5:41 AM - 14 May 2018
    • 90 Retweets
    • 149 Likes
    • José Roberto David Medina Sean Blakey Tim van Scherpenzeel CIOekho S Andrew King LightningStrike matt osborne
    5 replies 90 retweets 149 likes
      1. New conversation
      2. Dan Guido‏ @dguido May 14

        Most of us archive our entire history of email. The efail team could have released scripts that review your mailbox for signs of exploitation. Don't you think an img tag wrapping the multipart header would stick out a bit? Even the CFB/CBC gadget is discoverable after decrypting.

        2 replies 10 retweets 31 likes
        Show this thread
      3. Dan Guido‏ @dguido May 14

        I also don't see any attempt to coordinate with major MTAs (e.g., Google or Microsoft). MTAs could have set up detections for direct exploitation and, likely, reviewed everyone's mailboxes for already delivered mail.pic.twitter.com/26SojYl2xb

        2 replies 7 retweets 26 likes
        Show this thread
      4. Dan Guido‏ @dguido May 14

        Don't confuse my distaste for the disclosure with advocacy for S/MIME, PGP, or encrypted email. You should: 1) use authenticated cryptography ffs! 2) stop using email and start using Signal if you need privacy

        5 replies 3 retweets 20 likes
        Show this thread
      5. End of conversation
      1. Adam  ♿‏ @voltagex May 14
        Replying to @dguido

        Can I borrow "intellectually neat, operationally stupid"?

        0 replies 0 retweets 7 likes
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      1. Marsh Ray‏ @marshray May 15
        Replying to @dguido @jjarmoc

        Ransomware is obvious after you’ve been hit too but that doesn’t make it not a serious threat.

        0 replies 0 retweets 1 like
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      1. New conversation
      2. Thomas Balu Walter‏ @balu May 17
        Replying to @dguido

        It’s not only about man-in-the-middle attacks to catch-modify-release mails. If a three-letter-agency gets access to your mailbox (which is what they do), they can easily hide their traces after they presented you a modified email.

        1 reply 0 retweets 0 likes
      3. Thomas Balu Walter‏ @balu May 17
        Replying to @balu @dguido

        And that one mail can contain thousands of encrypted messages in multiple mime parts prepared to be exfiltrated. Plus something irrelevant on top

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Rolf‏ @rolfje May 14
        Replying to @dguido @binitamshah

        Doesn't that depend on the value of the information? A financial attacker wouldn't care. But a nation state targeting Snowden... (luckily I don't consider myself that interesting ;-)

        1 reply 0 retweets 0 likes
      3. rugk‏ @rugkme May 14
        Replying to @rolfje @dguido @binitamshah

        of course, threat models always matter

        0 replies 0 retweets 0 likes
      4. End of conversation

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