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-4.2.8p15was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.
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.
ntpq, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not including ntp-4.3.94.
ntpqcan be triggered by a malicious
ntpqrequests the restriction list from the server. This is due to a missing length check in the
reslist()function. It occurs whenever the function parses the serverís response and encounters a
flagstrvariable of an excessive length. The string will be copied into a fixed-size buffer, leading to an overflow on the functionís stack-frame. Note well that this problem requires a malicious server, and affects
ntpqthen if you want to know the
reslistof an instance of
ntpdthat you do not control, know that if the target
ntpdis malicious that it can send back a response that intends to crash your