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.
https://www.freebsd.org/security/advisories/FreeBSD-SA-15:08.bsdinstall.asc
https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-1552
http://www.securitytracker.com/id/1032042
http://www.securityfocus.com/archive/1/535209/100/0/threaded
http://packetstormsecurity.com/files/131338/FreeBSD-10.x-ZFS-encryption.key-Disclosure.html