Secunia Security Advisory – Debian has issued an update for ntp. This fixes a security issue, which can cause ntpd to run with incorrect group permissions.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/39834/sa16687.txt
Source: https://packetstormsecurity.com/files/39834/Secunia-Security-Advisory-16687.html