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j00ru's profile
j00ru//vx
j00ru//vx
j00ru//vx
@j00ru

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j00ru//vx

@j00ru

Windows hacker & vulnerability researcher. Google Project Zero. @DragonSectorCTF

Poland
j00ru.vexillium.org
Joined April 2010

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    j00ru//vx‏ @j00ru Aug 14

    Meet BrokenType – the font fuzzing toolset that helped me find 39 vulns in the Windows kernel and user-mode Uniscribe library in 2015-2017. It includes a font mutator, generator and loader. Now on GitHub:https://github.com/google/BrokenType …

    3:40 AM - 14 Aug 2018
    • 591 Retweets
    • 1,143 Likes
    • smada Antonio Sanso Siva Siva symeon Noris Alsaadie Adrian Antonio Dini bit charlatan Sam Cappella
    5 replies 591 retweets 1,143 likes
      1. New conversation
      2. Tal Be'ery‏ @TalBeerySec Aug 14
        Replying to @j00ru

        Why no vulns on 2018? something changed in Windows? All hanging fruits were picked? other?

        2 replies 0 retweets 2 likes
      3. j00ru//vx‏ @j00ru Aug 14
        Replying to @TalBeerySec

        Yep, after N iterations of fuzzing and reporting the bugs to the vendor, we finally stopped seeing any more crashes. A related, important change is the fact that Win 10 handles fonts in sandboxed ring 3 (instead of ring 0), which diminishes the value of such issues

        2 replies 8 retweets 36 likes
      4. Francisco Alonso‏ @revskills Aug 14
        Replying to @j00ru @TalBeerySec

        It is still useful if someone adds support to Graphite tables Silf, Glat, Gloc, Feat, Sil. eg: my font fuzzer used fonttools with a custom mutator in libFuzzer that was quite useful in Mozilla Firefox.

        1 reply 0 retweets 3 likes
      5. j00ru//vx‏ @j00ru Aug 14
        Replying to @revskills @TalBeerySec

        Indeed, I'm not playing with fonts anymore but I'm hoping the code can be useful to others to build a more effective fuzzer or use it to test software other than Windows

        1 reply 0 retweets 5 likes
      6. Francisco Alonso‏ @revskills Aug 14
        Replying to @j00ru @TalBeerySec

        Same here :), thanks for sharing

        0 replies 0 retweets 0 likes
      7. End of conversation
      1. New conversation
      2. Michal Purzynski‏ @MichalPurzynski Aug 14
        Replying to @j00ru @Zaufana3Strona

        Windows 10 does not handle fonts in the kernel, does it? Is the font handling still privileged and cussing worthy?

        1 reply 0 retweets 1 like
      3. 1 more reply
      1. Amir Jalali‏ @forbiddenhi Aug 14
        Replying to @j00ru

        tnx

        0 replies 0 retweets 0 likes
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      1. Jared DeMott‏ @JaredDeMott Aug 14
        Replying to @j00ru

        fun thx!

        0 replies 0 retweets 0 likes
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      1. Nimrod Ben-Em  🤘🏽‏ @nimrodyo Aug 14
        Replying to @j00ru

        Why now?

        0 replies 0 retweets 0 likes
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