FreeBSD Security Advisory – Insufficient sanity checking of paths containing ‘.’ and ‘..’ allows gtar to overwrite arbitrary files on the system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/61387/FreeBSD-SA-07-10.gtar.txt
Source: https://packetstormsecurity.com/files/61387/FreeBSD-SA-07-10.gtar.txt.html