Published: Thursday, July 27th, 2017
Last Update: Friday, October 11th, 2019
In November, 2016, NTP.org released a security advisory detailing a number of security issues. The following vulnerabilities reported in the NTP advisory are addressed in this document.
||ntpd Rx server response from spoof on wrong I/F [1, 2]
||ntpd bug - jitter value higher than expected [1, 3]
The table below indicates releases of ACOS exposed to these vulnerabilities and ACOS releases that address these issues or are otherwise unaffected by them.
Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.
||Releases Resolved or Unaffected
|4.1.1 – 4.1.1-P1
|4.1.100 – 4.1.100-P5
|4.1.0 – 4.1.0-P9
|3.1.0-P1 – 3.2.1-P1
|2.8.2 – 2.8.2-P8
|2.7.2 – 2.7.2-P11
|2.7.1-GR1 – 2.7.1-GR1-P1
|2.6.1-GR1 – 2.6.1-GR1-P16
(a) Including all updates to the release(s).
Workarounds and Mitigations
Common security best practices in the industry for network appliance management and control planes can enhance protection against remote malicious attacks. Limit the exploitable attack surface for critical, infrastructure, networking equipment through the use of access lists or firewall filters to and from only trusted, administrative networks or hosts.
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