NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.
ntp-4.2.8p9was released on 21 November 2016. It addresses 1 high- (Windows only), 2 medum-, 2 medum-/low-, and 5 low-severity security issues, 28 bugfixes, and contains other improvements over 4.2.8p8.
Please see the NTP Security Notice for vulnerability and mitigation details.Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.
ntpdis fed a crafted mode 6 or mode 7 packet containing an unusually long data value where a network address is expected, the
decodenetnum()function will abort with an assertion failure instead of simply returning a failure condition.
restrict noqueryto limit who can send mode 6 and mode 7 requests.
requestkeyauthentication directives to limit who can send mode 6 and mode 7 requests.