Avast High Sierra System Extension Blocked

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Hi,

  1. Avast High Sierra System Extension Blocked Google Drive
  2. Avast High Sierra System Extension Blocked Free
  3. Avast High Sierra System Extension Blocked Mac

In these cases, System extensions need to be allowed once the same as only one System Extension Blocked notification was displayed. MacOS High Sierra (10.13). After installing Avast Security, Avast Premium Security, or Avast Omni, you may see the status message This Mac is in passive mode. This is because the Core Shields are disabled due to the Avast Software extensions being blocked by your macOS. To allow Avast Software extensions, follow the instructions below. Avast WEBforum » Consumer Products » Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) (Moderators: MartinZ, hectic-mmv, petr.chytil, slavo.benko, LudekS) » Mac OS High Sierra 'Allow' Problem.

Avast High Sierra System Extension Blocked Google Drive


Today I couldn't run a Windows 10 VM on a Mac Host, nor update my VirtualBox 6.x to version 6.1.14. In both cases I receive an error saying that the 'Kernel driver not installed (rc=-1908)'. I don't remember to have updated High Sierra since the last time I run VirtualBox, nor changed anything in my system.
By searching in the forum, I see that this may be caused by the VB kernel extensions being blocked by High Sierra. EtreCheck says, actually, that all the VB extension are not loaded:
[Not Loaded] VBoxDrv.kext (Oracle America, Inc., 6.1.14)

Avast High Sierra System Extension Blocked Free


[Not Loaded] VBoxNetAdp.kext (Oracle America, Inc., 6.1.14)
[Not Loaded] VBoxNetFlt.kext (Oracle America, Inc., 6.1.14)

Avast High Sierra System Extension Blocked Mac

Avast high sierra system extension blocked windows 10
[Not Loaded] VBoxUSB.kext (Oracle America, Inc., 6.1.14)
The trick of going to the Security System Preference didn't work, since there is no button to trust Oracle. Is there any other way to tell the Mac to load those extensions?
And, since I don't remember having changed anything in my system (apart for the usual cleaning with Cocktail), does this reveal some other type of issue?
Thanx!
Paolo