Sun Security Advisory – If a local unprivileged user executes the gzip(1) command and specifies the -force or -f command line option, files which are hard linked to the target file(s) will have their permissions changed. This could allow other local unprivileged users the ability to read or modify files owned by the invoking user, or system files if gzip(1) is issued by a local privileged user.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34605/57600.html
Source: https://packetstormsecurity.com/files/34605/57600.html.html