RHEL 6 / 7 : ntp (RHSA-2016:0063)
Medium Nessus Plugin ID 88172
SynopsisThe remote Red Hat host is missing one or more security updates.
DescriptionUpdated ntp packages that fix one security issue are now available for Red Hat Enterprise Linux 6 and 7.
Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
The Network Time Protocol (NTP) is used to synchronize a computer's time with a referenced time source.
It was discovered that ntpd as a client did not correctly check the originate timestamp in received packets. A remote attacker could use this flaw to send a crafted packet to an ntpd client that would effectively disable synchronization with the server, or push arbitrary offset/delay measurements to modify the time on the client.
All ntp users are advised to upgrade to these updated packages, which contain a backported patch to resolve this issue. After installing the update, the ntpd daemon will restart automatically.
SolutionUpdate the affected packages.