https://macdailynews.com/2017/12/02/updating-to-latest-macos-10-13-1-disables-apples-root-bug-patch-youll-need-to-reinstall-apples-root-security-fix/
Updating to latest macOS 10.13.1 disables Apple's 'root' bug patch; you'll need to reinstall Apple's root security fix