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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Will Dormann‏ @wdormann 16 Nov 2017
      • Report Tweet
      • Report NetzDG Violation

      Will Dormann Retweeted Will Dormann

      Starting with Windows 8.0, system-wide mandatory ASLR (enabled via EMET) has zero entropy, essentially making it worthless. Windows Defender Exploit Guard for Windows 10 is in the same boat. More details to come...https://twitter.com/wdormann/status/930916460473577474 …

      Will Dormann added,

      Will Dormann @wdormann
      Replying to @epakskape @markwo @0xdabbad00
      Actually, with Windows 7 and EMET System-wide ASLR, the loaded address for eqnedt32.exe is different on every reboot. But with Windows 10 with either EMET or WDEG, the base for eqnedt32.exe is 0x10000 EVERY TIME. Conclusion: Win10 cannot be enforce ASLR as well as Win7! pic.twitter.com/Jp10nqk1NQ
      9 replies 176 retweets 226 likes
      Show this thread
    2. Matt Miller‏ @epakskape 16 Nov 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wdormann

      System-wide mandatory ASLR via EMET on Windows 8+ & WDEG will provide entropy so long as the EXE has been linked with dynamicbase. If the EXE is not dynamicbase, you must enable bottom-up ASLR for entropy. The mechanism used for system-wide mandatory ASLR changed between 7 and 8.

      1 reply 12 retweets 35 likes
      Will Dormann‏ @wdormann 16 Nov 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @epakskape

      How does one enable bottom-up ASLR system-wide on Windows 8+ ?

      8:45 AM - 16 Nov 2017
      • 2 Retweets
      • 1 Like
      • Katie Moussouris Jim Lippard
      2 replies 2 retweets 1 like
        1. New conversation
        2. Matt Miller‏ @epakskape 16 Nov 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @wdormann

          Set bit 15 (0x10000) in HKLM\System\CurrentControlSet\Control\Session Manager\Kernel\MitigationOptions (REG_QWORD). The WDEG team is looking at how to better support this from the UI.

          4 replies 7 retweets 28 likes
        3. Will Dormann‏ @wdormann 16 Nov 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @epakskape

          Or for those not proficient in setting bits in binary registry values (such as myself), either manually set the values indicated in this picture, or if you don't care about clobbering any existing system-wide mitigations, import this .REG file: https://gist.github.com/wdormann/43cffbf823b5c5da8682985ef31c16a9 …pic.twitter.com/i4YNpET0wq

          0 replies 3 retweets 9 likes
        4. End of conversation
        1. Marie Helene‏ @Savagedlight 16 Nov 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @wdormann @epakskape

          It was enabled by default on my device, not touched the setting myself. Did use EMET before fall creators update though, in case it's relevant. (Windows Defender Security Centre -> App & Browser Control -> Explot Protection Settings (at the bottom))

          0 replies 0 retweets 0 likes
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