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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 7 Jun 2018
      • Report Tweet
      • Report NetzDG Violation

      It looks like today's update for the Flash vulnerability CVE-2018-5002 introduces a new prompt before loading remote content. Seems like a good idea, for those of you who still have Flash installed on your system for some reason.pic.twitter.com/cGd3iFZpLW

      4 replies 47 retweets 71 likes
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    2. Will Dormann‏ @wdormann 7 Jun 2018
      • Report Tweet
      • Report NetzDG Violation

      Note that my original tweet implied that it was the user's decision to have Flash on their system. This isn't fair to Windows 10 users. You get Flash whether you want it or not. It's not your decision to make. Flash is exposed to MS Office, and not just your browsers.

      1 reply 4 retweets 13 likes
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    3. Will Dormann‏ @wdormann 7 Jun 2018
      • Report Tweet
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      While I don't see a way to uninstall Flash from Windows 10, you can still disable the Flash ActiveX control by setting the kill bit for it. Microsoft Office honors the Internet Explorer kill bit settings.https://gist.github.com/wdormann/677a9e7c218f65d9f2990e96e442a290 …

      2 replies 8 retweets 13 likes
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    4. MCKSys Argentina‏ @MCKSysAr 7 Jun 2018
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      • Report NetzDG Violation
      Replying to @wdormann

      That .reg points to CLSID {D27CDB6E-AE6D-11cf-96B8-444553540000}, but in my win10 Flash seems to be in {D27CDB70-AE6D-11cf-96B8-444553540000}. And you can't change that value. Check the 2nd CLSID inhttps://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-020 …

      1 reply 0 retweets 0 likes
    5. Will Dormann‏ @wdormann 8 Jun 2018
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      Replying to @MCKSysAr

      Windows treats certain CLSIDs as equivalent. While it may be possible to instantiate ActiveX via D27CDB70, killing D27CDB6E may be all that's needed to block it. Setting the kill bit for D27CDB6E blocks the exploit, as well as Flash in Internet Explorer for me.pic.twitter.com/ToKArc6t78

      1 reply 0 retweets 0 likes
    6. Will Dormann‏ @wdormann 8 Jun 2018
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      Replying to @wdormann @MCKSysAr

      Having said that, you've let me to realize that Edge uses a different kill bit than IE (because of course). I've updated the gist to include the kill bit for Edge, as well as including the second CLSID just for paranoia sake, though it may not be needed. https://gist.github.com/wdormann/677a9e7c218f65d9f2990e96e442a290 …pic.twitter.com/numAGxt8ru

      1 reply 1 retweet 1 like
      Will Dormann‏ @wdormann 8 Jun 2018
      • Report Tweet
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      Replying to @wdormann @MCKSysAr

      Ah, I see what you mean about the latter not being able to be changed. However, I suspect that the first is sufficient. It alone is sufficient to block Flash in my testing.

      9:26 AM - 8 Jun 2018
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