CVE-2016-7426 log

Severity Low
Remote Yes
Type Denial of service
When ntpd is configured with rate limiting for all associations (restrict default limited in ntp.conf), the limits are applied also to responses received from its configured sources. An attacker who knows the sources (e.g., from an IPv4 refid in server response) and knows the system is (mis)configured in this way can periodically send packets with spoofed source address to keep the rate limiting activated and prevent ntpd from accepting valid responses from its sources.
Group Package Affected Fixed Severity Status Ticket
AVG-80 ntp 4.2.8.p8-1 4.2.8.p9-1 High Fixed
AVG-79 ntp 4.2.8.p8-1 4.2.8.p9-1 High Fixed
Date Advisory Group Package Severity Type
26 Nov 2016 ASA-201611-28 AVG-79 ntp High multiple issues
If you choose to use restrict default limited ..., be sure to use restrict source ... (without limited) to avoid this attack.