VirtualBox "Wrong SSL Certificate Format" Error

VirtualBox (v5.2.2 as of this writing) on my Mac (MacOS 10.13.1) frequently fails to check for updates, etc. with the following error message: "Wrong SSL Certificate Format." I looked around periodically but could not find a solution. Until I stumbled on this: replace ~/Library/VirtualBox/vbox-ssl-cacertificate.crt with content from https://www.virtualbox.org/attachment/ticket/12340/vbox-ssl-cacertificate.crt Problem solved. Finally!