About macOS Mojave Security Update 2021-005 10.14.6. I can't install this upgrade on my iMac27 late 2014. Downloading is OK, but at the end of installing, I get the message that is wasn't possible. Same for Big Sur. IMac 27″, macOS 10.14. Posted on Sep 16, 2021 2:27 AM. I have this question too. Jul 21, 2021 Apple has released the full list of security updates that were released today to both macOS Mojave and macOS Catalina. The updates include fixes to audio, Bluetooth, and WebKit. You can check out the full list of security fixes below: Impact: An application may be able to execute arbitrary code with kernel privileges.
Full release notes are available here
To follow up with this, there was a similar looking issue reported here pointing to a thread on MacRumors there.
The thread says that the problem is with accounts that are connected to a Windows AD however this is not my experience as my network is Mac Only using an OD on a Mac Server. But still, I did some testing and the below procedure quoted from MacRumors indeed allows for my affected users to connect on a machine upgraded to 2021-004:
'The fix (well, really just a stop-gap measure until I can discover the actual cause) is to basically tell the OS to ignore cached Kerberos credentials for authorization (as well as screensaver). A shout out to @jojo on #MacAdmins for confirming my suspicions. To do this you will need to edit two system files (yours should look similar to these):
Using your favorite text editor (sudo) remove use_kcminit from each file.
But not understanding why this works is a no-no for me to implement this on anything else but a test machine, so I will wait for a proper patch from Apple before updating the rest of my machines. I contacted them on their support link and I urge you to do the same if you experience the same issue.
May 27, 2021 1:35 AM