Problem Description:
When downloading updates to FreeBSD via 'freebsd-update fetch' or
'freebsd-update upgrade', the freebsd-update(8) utility copies
currently installed files into its working directory
(/var/db/freebsd-update by default) both for the purpose of merging
changes to configuration files and in order to be able to roll back
installed updates.
The default working directory used by freebsd-update(8) is normally
created during the installation of FreeBSD with permissions which
allow all local users to see its contents, and freebsd-update(8) does
not take any steps to restrict access to files stored in said
directory.