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.
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.
ctl_getitem()
return value not always checked ntpq
and ntpdc
can be used to store and retrieve information in ntpd
. It is possible to store a data value that is larger than the size of the buffer that the ctl_getitem()
function of ntpd
uses to report the return value. If the length of the requested data value returned by ctl_getitem()
is too large, the value NULL
is returned instead. There are 2 cases where the return value from ctl_getitem()
was not directly checked to make sure it's not NULL
, but there are subsequent INSIST()
checks that make sure the return value is not NULL
. There are no data values ordinarily stored in ntpd
that would exceed this buffer length. But if one has permission to store values and one stores a value that is "too large", then ntpd
will abort if an attempt is made to read that oversized value.
ntpd
instances