RHEL 6 : ntp (RHSA-2015:2520)
Medium Nessus Plugin ID 87101
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 6.5 and 6.6 Extended Update Support.
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 timestamps in Kiss-of-Death packets. A remote attacker could use this flaw to send a crafted Kiss-of-Death packet to an ntpd client that would increase the client's polling interval value, and effectively disable synchronization with the server. (CVE-2015-7704)
Red Hat would like to thank Aanchal Malhotra, Isaac E. Cohen, and Sharon Goldberg of Boston University for reporting this issue.
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.