As of 18 Dec 2014 NTPD released V 4.2.8 this addressed multiple vulnerability with all previous versions.
Update all your systems running NTPD (Linux, BSD, Unix based) to V 4.2.8
NTPq -c Version to display your current version of NTPd
Desktop% ntpq -c version …
One of the background things that you rellly don’t think about untill it is a problem is Time Syncronization.
The standard method to ensure that you have the correct time is Network Time Protocal (NTP).
In linux this is comanaly already installed with your distrubution.
you can verify …more ...