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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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      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 81 retweets 88 likes
    2. Dan Guido‏ @dguido 29 Nov 2016
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      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
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      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 19 likes
    4. Dan Guido‏ @dguido 29 Nov 2016
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      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 28 likes
    5. Dan Guido‏ @dguido 29 Nov 2016
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      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 26 likes
    6. Dan Guido‏ @dguido 29 Nov 2016
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      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
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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
    8. 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
      Dan Guido‏ @dguido 29 Nov 2016
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      If you thought this exploit was from MSF, it's not. MSF has 8 Firefox exploits, none of them match this new one.

      9:51 PM - 29 Nov 2016
      • 3 Retweets
      • 2 Likes
      • delan Dave Snodgrass Techmainland ටل 🧗
      4 replies 3 retweets 2 likes
        1. New conversation
        1. 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
        2. 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
        3. 7 more replies
        1. egyp7.‏ @egyp7 30 Nov 2016
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          Replying to @dguido

          not in MSF *yet*. #FTFY

          0 replies 0 retweets 4 likes
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        1. Donncha Ó Cearbhaill‏ @DonnchaC 29 Nov 2016
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          Replying to @dguido

          What's MSF?

          1 reply 0 retweets 0 likes
        2. Master SFPN‏ @SFPwN 29 Nov 2016
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          Replying to @DonnchaC @dguido

          Metasploit Framework ?

          1 reply 0 retweets 0 likes
        3. 1 more reply
        1. NoBigGovDuh‏ @NoBigGovDuh 30 Nov 2016
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          Replying to @dguido

          Msf

          0 replies 0 retweets 0 likes
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