YET ANOTHER GAPING HOLE IN WINDOW 10

Hard to believe that there are more security holes in Windows. CVE-2021-36934 is a bad one that can be abused by skilled workers. It has also been publicly disclosed.

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To fix the problem requires a workaround. Open an elevated command prompt:

icacls %windir%\system32\config\*.* /inheritance:e
  1. Delete any System Restore points and Shadow volumes that existed prior to restricting access to %windir%\system32\config.
  2. Create a new System Restore point (if desired).

See KB5005357 about removing shadow volumes etc

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