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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    Tavis Ormandy‏Verified account @taviso 8 Nov 2017
    • Report Tweet
    • Report NetzDG Violation

    This is crazy, instead of returning an error like a normal person, Windows 10 will BugCheck if you provide an ansi string instead of a unicode string to DefSetText(). 🙃https://gist.github.com/taviso/9e673add738de0da6534cbd20e705d3b …

    9:17 AM - 8 Nov 2017
    • 97 Retweets
    • 212 Likes
    • Alexandre Bécholey Sachin Thakuri Abdullah Al-Nahdi Diney Roberto Soares Chad Wheeler Cren Q Kelvin Umut Barış Öztunç
    4 replies 97 retweets 212 likes
      1. New conversation
      2. Genghis Karimov‏ @genghiskMSFT 13 Nov 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @taviso

        This has been fixed in the Fall Creators Update (1709 aka RS3): DefSetText now fixes up misaligned strings without bugchecking, effectively restoring the behaviour prior to introduction of internal structure integrity checks in the Anniversary Update (1607 aka RS1).

        1 reply 1 retweet 7 likes
      3. Tavis Ormandy‏Verified account @taviso 13 Nov 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @genghiskMSFT

        Whoa, that's awesome, thanks Genghis!

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. New conversation
      2. Graham Sutherland (Polynomial^DSS)‏ @gsuberland 8 Nov 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @taviso

        As in, explicit call to KeBugCheck on error condition?

        1 reply 0 retweets 2 likes
      3. Tavis Ormandy‏Verified account @taviso 8 Nov 2017
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        Replying to @gsuberland

        Yep! Crazy right?

        1 reply 0 retweets 2 likes
      4. 1 more reply
      1. New conversation
      2. James Ross‏ @silver42 8 Nov 2017
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        Replying to @taviso

        https://blogs.technet.microsoft.com/mmpc/2017/01/13/hardening-windows-10-with-zero-day-exploit-mitigations/ … suggests that they're intentionally bug checking on invalid data to that function because it was an exploit channel. Which _kinda_ makes sense but is still somewhat surprising.

        2 replies 0 retweets 12 likes
      3. Mitja Kolsek‏ @mkolsek 8 Nov 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @silver42 @taviso

        Adobe did the same with their quick (temporary) patch for CVE-2017-11292, before they had the chance to do proper input validation. That quick patch then broke VMware's SWFs. Not invonceivable that this DefSetText behavior could break stuff too.

        0 replies 5 retweets 13 likes
      4. End of conversation
      1. Arce‏ @Senas23 8 Nov 2017
        • Report Tweet
        • Report NetzDG Violation
        Replying to @taviso

        Travis wait, did you just call Windows 10 a person!? 😱😂

        0 replies 0 retweets 5 likes
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