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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

      Dan Guido Retweeted

      There's a bunch of misinformation about the new Firefox exploit so I'd like to clear a few things up. https://twitter.com/movrcx/status/803744059022069760 …

      Dan Guido added,

      This Tweet is unavailable.
      2 replies 86 retweets 89 likes
    2. Dan Guido‏ @dguido 29 Nov 2016
      Replying to @dguido

      Thanks to the efforts from a few dedicated members of Trail of Bits (@withzombies, scott, and others), I have real info to share.

      1 reply 7 retweets 13 likes
    3. Dan Guido‏ @dguido 29 Nov 2016
      Replying to @dguido

      First off, it's a garden variety use-after-free, not a heap overflow, and it affects the SVG parser Firefox.

      3 replies 11 retweets 20 likes
    4. Dan Guido‏ @dguido 29 Nov 2016
      Replying to @dguido

      MWR published research in this area years ago in WebKit, and it appears that Firefox is lagging a few years behind. https://labs.mwrinfosecurity.com/blog/mwr-labs-pwn2own-2013-write-up-webkit-exploit/ …

      1 reply 16 retweets 30 likes
    5. Dan Guido‏ @dguido 29 Nov 2016
      Replying to @dguido

      As far as exploit techniques, this is a routine UAF that heap sprays a controlled object to kick off a ROP chain. Pwn2Own 2012-level tech.

      1 reply 20 retweets 28 likes
    6. Dan Guido‏ @dguido 29 Nov 2016
      Replying to @dguido

      The controlled object eventually gives them RW access to memory, then its game over.

      1 reply 2 retweets 4 likes
    7. Dan Guido‏ @dguido 29 Nov 2016
      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 20 likes
    8. Dan Guido‏ @dguido 29 Nov 2016
      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 14 retweets 15 likes
    9. Dan Guido‏ @dguido 29 Nov 2016
      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
      Dan Guido‏ @dguido 29 Nov 2016

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

      9:52 PM - 29 Nov 2016
      • 12 Retweets
      • 7 Likes
      • Delan Azabani 🖥️🏳️‍🌈unsafe fn bot() ➡️ impl Geysers Jackie!! Igor Carron 🕉 Swâmi Petaramesh ⛱ Dave Snodgrass Techmainland ŃK• kenna
      1 reply 12 retweets 7 likes
        1. New conversation
        2. Dan Guido‏ @dguido 29 Nov 2016
          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
        3. Dan Guido‏ @dguido 29 Nov 2016
          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
        4. Dan Guido‏ @dguido 29 Nov 2016
          Replying to @dguido

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

          The shellcode is fairly simple. It calls back to 5.39.27.226 (check your logs). Again, nothing outrageous here.

          2 replies 5 retweets 7 likes
        6. Dan Guido‏ @dguido 29 Nov 2016
          Replying to @dguido

          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 38 retweets 44 likes
        7. Dan Guido‏ @dguido 29 Nov 2016
          Replying to @dguido

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

          3 replies 15 retweets 19 likes
        8. Dan Guido‏ @dguido 29 Nov 2016
          Replying to @dguido

          The story here is that there is no story. Software is buggy, 0days exist. Stop obsessing over single vulnerabilities. It's 2016, move fwd.

          2 replies 21 retweets 32 likes
        9. Dan Guido‏ @dguido 30 Nov 2016
          Replying to @dguido

          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,

          This Tweet is unavailable.
          0 replies 3 retweets 3 likes
        10. End of conversation

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