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-4.2.8p15 was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.
Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.
Configuration and Authorization Levels for
Background and History
suggests we need to classify operations on data types as follows:
In the context of prior discussions, safe-write would be any ntpq/ntpdc operation that changes the ntpd state, such as
ntpq -c ":config tos minsane 3"
except those segregated as particularly dangerous, risking not just timekeeping but the system on which it runs, including:
ntpq -c "saveconfig /path/to/overwrite"
ntpq -c ":config logfile /path/to/appendfile"
ntpq -c ":config enable stats"
ntpq -c ":config filegen ..."
- 16 Sep 2009
Do we need a table of
directives and state which category they fall under?
- 16 Sep 2009
ntp-dev-4.2.5p217 addresses these issues by disabling
by default unless there is a
configured in ntp.conf. Further, the following ntp.conf knobs are rejected from remote configuration:
- 20 Sep 2009