USN-5175-1: NTP vulnerability

6 December 2021

A security issue was fixed in NTP.

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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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 20.04
  • ntp - 1:4.2.8p12+dfsg-3ubuntu4.20.04.1+esm1
    Available with Ubuntu Pro

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

References

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Further reading