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-4.2.8p10was released on 21 March 2017. It addresses 6 medum- and 5 low-severity security issues, 4 informational security topics, 15 bugfixes, and contains other improvements over 4.2.8p9.
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.
ntpdmakes use of different wrappers around
ctl_putdata()to create name/value
ntpq(mode 6) response strings. For example,
ctl_putstr()is usually used to send string data (variable names or string data). The formatting code was missing a length check for variable names. If somebody explicitly created any unusually long variable names in
ntpd(longer than 200-512 bytes, depending on the type of variable), then if any of these variables are added to the response list it would overflow a buffer.
setvarvariable names longer than 200-512 bytes in your
ntpdinstances, and auto-restart
-g) if it stops running.