The bsdinstall installer in FreeBSD 10.x before 10.1 p9, when configuring full disk encrypted ZFS, uses world-readable permissions for the GELI keyfile (/boot/encryption.key), which allows local users to obtain sensitive key information by reading the file.
http://www.securitytracker.com/id/1032042
http://www.securityfocus.com/archive/1/535209/100/0/threaded