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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 7 Apr 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @dguido @berendjanwever @InfiltrateCon

      Did I find 1k bugs or 1 bug 1k times? Is this a vuln or a random crash? No one pays for crashes.

      1 reply 1 retweet 2 likes
    2. Dan Guido‏ @dguido 7 Apr 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @dguido @berendjanwever @InfiltrateCon

      @berendjanwever is evaluating 2500 crashes per day on major browsers. This yields about 1 vuln per month. For a sample, check #DailyBug.

      1 reply 2 retweets 6 likes
    3. Dan Guido‏ @dguido 7 Apr 2017
      • Report Tweet
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      Replying to @dguido @berendjanwever @InfiltrateCon

      Dumb fuzzing yields poor results on browsers today. @berendjanwever's fuzzers understand the DOM and coordinate to find complex interactions

      1 reply 3 retweets 6 likes
    4. Dan Guido‏ @dguido 7 Apr 2017
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      Replying to @dguido @berendjanwever @InfiltrateCon

      MemGC in IE made 90% of his use-after-free bugs practically unexploitable. "This took a bite out of my income."

      1 reply 2 retweets 5 likes
    5. Dan Guido‏ @dguido 7 Apr 2017
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      Replying to @dguido @berendjanwever @InfiltrateCon

      MemGC is not a cure-all. A few UAFs are still exploitable. He's also finding type confusion, out of bounds reads/writes. UAFs are declining.

      1 reply 1 retweet 5 likes
    6. Dan Guido‏ @dguido 7 Apr 2017
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      Replying to @dguido @berendjanwever @InfiltrateCon

      BugID automatically performs common crash analysis steps. Goal was make more $ by reporting faster to bounty programs.

      1 reply 1 retweet 3 likes
    7. Dan Guido‏ @dguido 7 Apr 2017
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      Replying to @dguido

      BugID is a wrapper around CDB on Windows. It is similar to !exploitable but with more useful output. !exploitable was never useful for him.

      1 reply 0 retweets 0 likes
    8. Dan Guido‏ @dguido 7 Apr 2017
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      Replying to @dguido

      BugID reports contain lots of raw data plus a human readable summary.pic.twitter.com/eYIdJ7ej79

      1 reply 0 retweets 2 likes
    9. Dan Guido‏ @dguido 7 Apr 2017
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      Replying to @dguido

      BugID detects 1st and 2nd chance exceptions. Then asks, what kind of bug causes this kind of exception?pic.twitter.com/dQ1Ihlkijg

      1 reply 0 retweets 1 like
    10. Dan Guido‏ @dguido 7 Apr 2017
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      Replying to @dguido

      Needed a method to identify unique bugs. Encodes where, what, and how into a "bug id." Attempts to resolve differences in 32/64-bit builds.pic.twitter.com/IDV6LRwCmD

      1 reply 2 retweets 5 likes
      Dan Guido‏ @dguido 7 Apr 2017
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      Stages of BugID development: 1. Run tests unattended 2. Don't waste time on known issues 3. Filter by type (filter non-issues) 4. Print $$$

      8:41 AM - 7 Apr 2017
      2 replies 0 retweets 1 like
        1. New conversation
        1. Dan Guido‏ @dguido 7 Apr 2017
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          Replying to @dguido

          If symbols are available, BugID tries to look up location in Chrome/Firefox src code. Grades UAFs by estimated control of allocations. Neat!

          1 reply 0 retweets 1 like
        2. Dan Guido‏ @dguido 7 Apr 2017
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          Replying to @dguido

          BugID tracks distance between AVs and poison values to estimate control. Works for every bug type. Encoded on "bug id hash", easy to grep.pic.twitter.com/u5370K9VC4

          2 replies 1 retweet 2 likes
        3. 2 more replies
        1. Morgan Marquis-Boire‏Verified account @headhntr 7 Apr 2017
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          Replying to @dguido

          Find (exploitable) bugs, stack paper.

          0 replies 1 retweet 0 likes
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