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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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    Will Dormann‏ @wdormann 17 Jan 2018
    • Report Tweet
    • Report NetzDG Violation

    A non-admin user in macOS High Sierra can approve a kernel module to be loaded with a single click, without providing their own or an administrator's credentials. Is this expected behavior?pic.twitter.com/fyyfacspix

    7:32 AM - 17 Jan 2018
    • 522 Retweets
    • 792 Likes
    • crazyios eh ArtVirtualDecor Addison Bean Syed Matthew Solution Developer Benedikt Geißler Patrik Schmittat
    47 replies 522 retweets 792 likes
      1. New conversation
      2. Celso Santos‏ @Zed_Blade 17 Jan 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann @Av1anFlu

        I'd already noticed that before but since I was on an admin account didn't think much of it.. I'd say that's a bug, like the App Store one

        1 reply 0 retweets 10 likes
      3. Will Dormann‏ @wdormann 17 Jan 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @Zed_Blade @Av1anFlu

        I've noticed a number of issues on both Windows and OSX/macOS that stem from always running as a non-admin user. I always though that "don't run as admin" was a standard infosec piece of advice, but based on what I've seen I doubt that it's a strategy that is widely used.

        1 reply 0 retweets 10 likes
      4. 3 more replies
      1. Will Dormann‏ @wdormann 19 Jan 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @superezfe

        Thanks. To me, that's a little misleading. If the padlock says "Click the lock to make changes", I'd think that anything that changes the system (such as the action taken as the result of clicking the "Apply" button) would require that the padlock be open.

        0 replies 0 retweets 1 like
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      1. Will Dormann‏ @wdormann 19 Jan 2018
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        • Report NetzDG Violation
        Replying to @superezfe

        Is your comment about the padlock behavior based on personal experience? Or is there a reference somewhere that lists which things require it and which ignore it?

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. Hacker Fantastic‏ @hackerfantastic 17 Jan 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann

        Erm that would be a LPE for trivial root if right, you should dtrace that app and see how it calls loading the kext into memory, maybe there is a trivial exploit lurking there.

        1 reply 0 retweets 13 likes
      3. Will Dormann‏ @wdormann 17 Jan 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @hackerfantastic

        Just to be clear, the kernel module was attempted to be loaded *with* admin privileges (normal VirtualBox installer run as admin, in the case of the screenshots). It's just the approval part that appears to not require any privileges. Q: Should approval require admin privileges?

        1 reply 4 retweets 14 likes
      4. 1 more reply
      1. New conversation
      2. dave, builder of ridiculous things  🛠‏ @syn 17 Jan 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann @BrianLinuxing

        Yes, I believe so. User approval for kexts is new - I think the decision to not require admin credentials is a decision that reduces friction. It's still better than it was, and it still takes admin privs to write and load the kext in the first place.

        1 reply 1 retweet 6 likes
      3. dave, builder of ridiculous things  🛠‏ @syn 17 Jan 2018
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        Replying to @syn @wdormann @BrianLinuxing

        You can load a kext as a normal user if it's in /System but SIP stops anyone but Apple writing things there (even as root). Outside /System, kextload needs to be invoked as root. The 'Allow' button is just extra security on top to provide user approval based on the signature.

        0 replies 2 retweets 6 likes
      4. End of conversation
      1. New conversation
      2. Stephen Hoffman‏ @HoffmanLabs 18 Jan 2018
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        • Report NetzDG Violation
        Replying to @wdormann @thegrugq

        Yes; known. This is an upgrade in security from previous behaviors. Kernel Extensions (kexts) are now specifically signed, and are now specifically enabled by the user or by policy, after (admin) install of kit: https://derflounder.wordpress.com/2017/08/24/kernel-extensions-and-macos-high-sierra/ … Code signing https://developer.apple.com/library/content/documentation/Security/Conceptual/CodeSigningGuide/Introduction/Introduction.html …

        1 reply 6 retweets 7 likes
      3. Stephen Hoffman‏ @HoffmanLabs 18 Jan 2018
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        Replying to @HoffmanLabs @wdormann @thegrugq

        So… Admin install to get the kernel extension (kext) in the right spot for the load, and now with kext-specific signing, and with user approval for the kext load. For MDM-based folks, changes to thrnprovisioning path security are underway. Traceable to a kext private key.

        0 replies 0 retweets 3 likes
      4. End of conversation

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