1. Ubuntu Security Notices
  2. USN-5175-1

USN-5175-1: NTP vulnerability

Publication date

6 December 2021

Overview

A security issue was fixed in NTP.

Releases

Packages

  • ntp - Network Time Protocol daemon and utility programs

Details

It was discovered that ntpd incorrectly handled memory when CMAC keys
were used. A remote attacker could possibly use this issue to cause ntpd to
crash resulting in a denial of service.

It was discovered that ntpd incorrectly handled memory when CMAC keys
were used. A remote attacker could possibly use this issue to cause ntpd to
crash resulting in a denial of service.

Update instructions

After a standard system update you need to restart the ntpd service to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
20.04 focal ntp –  1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1  

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References

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