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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. Mitja Kolsek‏ @mkolsek 6 Nov 2019
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      Replying to @fritzboger

      True, for computers having at least one such product installed. Use @wdormann's script to check your computer:https://gist.github.com/wdormann/eb714d1d935bf454eb419a34be266f6f …

      1 reply 1 retweet 2 likes
    2. Soren Fritzboger‏ @fritzboger 6 Nov 2019
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      Replying to @mkolsek @wdormann

      Yeah @wdormann's script is very useful. Ive used it a fair amount of times

      1 reply 0 retweets 1 like
    3. Mitja Kolsek‏ @mkolsek 6 Nov 2019
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      Replying to @fritzboger @wdormann

      Mitja Kolsek Retweeted Will Dormann

      Paging @SwiftOnSecurity! Wouldn't it be educational if you ran this script on all your corporate computers, aggregate results and publish a list of apps that were found to be putting the everyone-writable-PATH hole in the system?https://twitter.com/wdormann/status/1192180116417392642 …

      Mitja Kolsek added,

      Will Dormann @wdormann
      Replying to @mkolsek @msftsecurity
      Indeed. This happens more often than it should. I've written a PowerShell script to check for the problem. https://gist.github.com/wdormann/eb714d1d935bf454eb419a34be266f6f … pic.twitter.com/mSNyBEZPlJ
      3 replies 17 retweets 58 likes
    4. Alan Dooley‏ @dooley_do 6 Nov 2019
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      Replying to @mkolsek @SwiftOnSecurity and

      Use run scripts in ConfigMgr and it will collate the results in there

      1 reply 0 retweets 1 like
    5. Nathan McNulty‏ @NathanMcNulty 6 Nov 2019
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      Replying to @dooley_do @mkolsek and

      Unfortunately, this won't work since the script requires running without administrative privileges. Scripts always run as SYSTEM:https://docs.microsoft.com/en-us/configmgr/apps/deploy-use/create-deploy-scripts#target-machine-execution …

      1 reply 0 retweets 1 like
    6. Soren Fritzboger‏ @fritzboger 6 Nov 2019
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      Replying to @NathanMcNulty @dooley_do and

      Should be fairly easy to modify the script to check ACL for regular users instead of write access by the current user

      1 reply 0 retweets 0 likes
    7. Nathan McNulty‏ @NathanMcNulty 6 Nov 2019
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      Replying to @fritzboger @dooley_do and

      Sure, fairly easy... Knock yourself out bud ;) Good luck evaluating for all of these conditions: https://docs.microsoft.com/en-us/dotnet/api/system.security.accesscontrol.filesystemrights?view=netframework-4.8 … Don't forget, you can't key off just BUILTIN\Users, NT AUTHORITY\Authenticated Users, and EVERYONE. You need to check all AD and local security groups.

      2 replies 0 retweets 1 like
    8. Soren Fritzboger‏ @fritzboger 7 Nov 2019
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      Replying to @NathanMcNulty @dooley_do and

      Doesn't this depend on your goals? If you want to do a full assessment of your AD, then yes you need to check all groups. But if you just want a quick list of possible candidates AUTHORITY\Authenticated Users should do just fine.

      1 reply 0 retweets 1 like
    9. Soren Fritzboger‏ @fritzboger 7 Nov 2019
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      Replying to @fritzboger @NathanMcNulty and

      As for the FileSystemRights, one of the following combinations should be enough ChangePermissions CreateFiles + WriteData TakeOwnership Write

      1 reply 0 retweets 1 like
    10. Nathan McNulty‏ @NathanMcNulty 7 Nov 2019
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      Replying to @fritzboger @dooley_do and

      Sorry man, honestly trying to show it's not that simple. Compiled permissions sometimes don't let you key off just the words. Our org has different permissions for staff than students, and I'd assume other environments are more complex. Here's an example of what I'm talking aboutpic.twitter.com/8Qrlr404w6

      2 replies 0 retweets 3 likes
      Will Dormann‏ @wdormann 7 Nov 2019
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      Replying to @NathanMcNulty @fritzboger and

      Yeah, I originally started to go down the ACL path (as you can see from the commented-out line in my gist. But I quickly realized that it was going to be overly complicated. Thus my compromise of just checking if the current user can create a file in the directories in question.

      8:51 AM - 7 Nov 2019
      • 1 Like
      • Nathan McNulty
      1 reply 0 retweets 1 like
        1. Nathan McNulty‏ @NathanMcNulty 7 Nov 2019
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          Replying to @wdormann @fritzboger and

          And it's honestly the most elegant solution to the problem. Why chase moving target of perms and security groups when you can just test creating a file and see if it lets you ;) I actually deployed as a discovery script in a CI/Baseline in ConfigMgr. Runs on every logon as user!

          0 replies 0 retweets 2 likes
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