USN-4215-1: NSS vulnerability

9 December 2019

nss vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM


NSS could be made to crash if it received a specially crafted certificate.

Software Description

  • nss - Network Security Service library


It was discovered that NSS incorrectly handled certain certificates. An attacker could possibly use this issue to cause a denial of service.

Update instructions

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

Ubuntu 19.04
libnss3 - 2:3.42-1ubuntu2.4
Ubuntu 18.04 LTS
libnss3 - 2:3.35-2ubuntu2.6
Ubuntu 16.04 LTS
libnss3 - 2:3.28.4-0ubuntu0.16.04.9
Ubuntu 14.04 ESM
libnss3 - 2:3.28.4-0ubuntu0.14.04.5+esm3
Ubuntu 12.04 ESM
libnss3 - 2:3.28.4-0ubuntu0.12.04.6

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.