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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. Matt Miller‏ @epakskape 15 Nov 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @wdormann @0xdabbad00 @markwo

      The entropy for force relocated images comes from bottom-up ASLR which is only enabled by default if the EXE was built with /dynamicbase. Try turning on bottom-up ASLR as well.

      1 reply 0 retweets 2 likes
    2. Will Dormann‏ @wdormann 15 Nov 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @epakskape @0xdabbad00 @markwo

      Thanks. I'm pretty sure that Bottom-up ASLR is enabled along with Mandatory ASLR. But eqnedt32.exe is always loaded at the same location.pic.twitter.com/zFgmbByCEP

      1 reply 0 retweets 0 likes
    3. Matt Miller‏ @epakskape 15 Nov 2017
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      Replying to @wdormann @0xdabbad00 @markwo

      I believe "on by default" means "use the default system policy" which means bottom-up ASLR will only be enabled if the EXE was linked with /dynamicbase (which this one does not, I believe). Sound right, @markwo?

      3 replies 0 retweets 1 like
    4. Mark Wodrich‏ @markwo 15 Nov 2017
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      Replying to @epakskape @wdormann @0xdabbad00

      Yeah, that's right. I was seeing what Will describes last night until I enabled bottom-up ASLR for this process in Exploit Guard

      1 reply 0 retweets 0 likes
    5. Will Dormann‏ @wdormann 15 Nov 2017
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      Replying to @markwo @epakskape @0xdabbad00

      Is there any way to enable Bottom-up ASLR on a system-wide basis? If not, then it would seem that Mandatory ASLR only really adds protection for apps that opt in. Which seems sort of non-Mandatory to me...

      1 reply 0 retweets 3 likes
    6. Matt Miller‏ @epakskape 15 Nov 2017
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      Replying to @wdormann @markwo @0xdabbad00

      It is possible to enable bottom-up ASLR system-wide, but I'm not sure if it can be done via the WDEG UI, @markwo might know. Agree with your feedback here. I passed it on to the team.

      1 reply 0 retweets 2 likes
    7. Will Dormann‏ @wdormann 15 Nov 2017
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      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

      4 replies 60 retweets 100 likes
    8. Matt Miller‏ @epakskape 21 Nov 2017
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      Replying to @wdormann @markwo @0xdabbad00

      For those of you catching up on this thread, MSRC has published a blog post clarifying the behavior that was observed here and how to workaround it:https://blogs.technet.microsoft.com/srd/2017/11/21/clarifying-the-behavior-of-mandatory-aslr/ …

      1 reply 7 retweets 14 likes
    9. LukÄç.jpg.exe‏ @boondaburrah 21 Nov 2017
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      Replying to @epakskape @SwiftOnSecurity and

      As a user, our IT had forced ASLR and random chrome tabs became unusable, some apps just wouldn't work, and the way cygwin shells fork to create new processes would just insta SEGFAULT. These were company supported apps. Please be careful with ASLR.

      1 reply 0 retweets 3 likes
    10. Will Dormann‏ @wdormann 21 Nov 2017
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      Replying to @boondaburrah @epakskape and

      This behavior of Cygwin has been known for years. It was suggested that hell would sooner freeze over before it were fixed. https://cygwin.com/ml/cygwin/2013-06/msg00096.html … If you need your GNU fix on a locked-down Windows system GOW seems to work fine (minus bash.exe).https://github.com/bmatzelle/gow/wiki …

      1 reply 0 retweets 1 like
      Will Dormann‏ @wdormann 21 Nov 2017
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      Replying to @wdormann @boondaburrah and

      Will Dormann Retweeted Will Dormann

      And apparently I had first noticed this years ago. I imagine that getting ASLR support in Cygwin is not anybody's priority.https://twitter.com/wdormann/status/477161240327094273 …

      Will Dormann added,

      Will Dormann @wdormann
      64bit Cygwin doesn't support always-on #ASLR https://cygwin.com/ml/cygwin/2013-06/msg00092.html … AMD flashback! http://www.cert.org/blogs/certcc/post.cfm?EntryID=95 …
      2:22 PM - 21 Nov 2017
      • 1 Like
      • 🥖🍞 Drew Michael Miranda
      1 reply 0 retweets 1 like
        1. New conversation
        2. LukÄç.jpg.exe‏ @boondaburrah 21 Nov 2017
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          Replying to @wdormann @epakskape and

          Based on what I saw ASLR + cygwin may be actually impossible due to the way the fork() syscall is supposed to work in POSIX.

          1 reply 0 retweets 1 like
        3. LukÄç.jpg.exe‏ @boondaburrah 21 Nov 2017
          • Report Tweet
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          Replying to @boondaburrah @wdormann and

          What drove me nuts is the corp forced on ASLR and also had cygwin as part of it's standard available packages. I don't know if they tested.

          0 replies 0 retweets 1 like
        4. End of conversation

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