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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. Dan Guido‏ @dguido 29 Nov 2016
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      Replying to @dguido

      This is not an advanced exploit. If you want to see one of those, check out Pegasus which had to deal with code signing and JIT pages.

      2 replies 11 retweets 19 likes
    2. Dan Guido‏ @dguido 29 Nov 2016
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      Replying to @dguido

      This type of exploit is much harder to write in Chrome and Edge due to memory partitioning, an exploit mitigation that Firefox lacks.

      1 reply 13 retweets 14 likes
    3. Dan Guido‏ @dguido 29 Nov 2016
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      Replying to @dguido

      If you thought this exploit was from MSF, it's not. MSF has 8 Firefox exploits, none of them match this new one.

      4 replies 3 retweets 2 likes
    4. Dan Guido‏ @dguido 29 Nov 2016
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      Replying to @dguido

      The version regex in the exploit matches Firefox 49, and the specific user-agent that the Tor Browser Bundle uses.pic.twitter.com/OjMf6T4JHA

      1 reply 11 retweets 7 likes
    5. Dan Guido‏ @dguido 29 Nov 2016
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      Replying to @dguido

      The vulnerability is present on macOS, but the exploit does not include support for targeting any operating system but Windows.

      1 reply 8 retweets 6 likes
    6. Dan Guido‏ @dguido 29 Nov 2016
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      Replying to @dguido

      If you were wondering, Mozilla is aware of the bug and has an open issue to track it.http://hg.mozilla.org/mozilla-central/rev/adcc39e3cad0 …

      2 replies 9 retweets 6 likes
    7. Dan Guido‏ @dguido 29 Nov 2016
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      It's not possible to determine the origin of the bug -- fuzzer or manual analysis. IMHO the author developed the exploit from scratch.

      1 reply 7 retweets 6 likes
    8. Dan Guido‏ @dguido 29 Nov 2016
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      The shellcode is fairly simple. It calls back to 5.39.27.226 (check your logs). Again, nothing outrageous here.

      1 reply 4 retweets 7 likes
    9. Dan Guido‏ @dguido 29 Nov 2016
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      Final thoughts: the Tor Browser Bundle is unable to protect those that need it most. If you rely on it, strongly reconsider your choices.

      4 replies 36 retweets 42 likes
    10. Dan Guido‏ @dguido 29 Nov 2016
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      Replying to @dguido

      Consider the difficulty of running a Tor exit node that injects this exploit into every HTTP session. ¯\_(ツ)_/¯

      2 replies 14 retweets 19 likes
      Dan Guido‏ @dguido 29 Nov 2016
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      The story here is that there is no story. Software is buggy, 0days exist. Stop obsessing over single vulnerabilities. It's 2016, move fwd.

      10:25 PM - 29 Nov 2016
      • 19 Retweets
      • 31 Likes
      • 🕉 Swâmi Petaramesh ⛱ Do u even dev, Bro? Dave Snodgrass Jessy Irwin ✨ Frank Köhntopp Armchair IR Mike Chelen 🐌 (he/him) qwertyoruiop Tylerr06
      2 replies 19 retweets 31 likes
        1. Dan Guido‏ @dguido 30 Nov 2016
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          Dan Guido Retweeted

          This is unlikely to work. All past info says LE exploits only run for very specific logged in users. https://twitter.com/csoghoian/status/803958781948338176 …

          Dan Guido added,

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          0 replies 3 retweets 3 likes
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        1. Aristotle Tzafalias‏ @Aristot73 29 Nov 2016
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          may we obsess about vulns at macro rather than micro level?

          0 replies 0 retweets 0 likes
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