+++ This bug was initially created as a clone of Bug #235880 +++

Raphael Marichez of Gentoo reported a denial of service flaw in vixie-cron.

By creating a hardlink to /etc/crontab, cron will stop executing the
/etc/crontab file and deposit an error message in /var/log/cron.

This can be easily tested by running:
ln /etc/crontab /tmp/crontab
tail -f /var/log/cron


Here is the patch from Open Wall Linux:
http://cvsweb.openwall.com/cgi/cvsweb.cgi/~checkout~/Owl/packages/vixie-cron/vixie-cron-4.1.20060426-owl-st_nlink.diff?rev=1.1;content-type=text%2Fplain

This flaw also affects FC5