USN-4203-1: NSS vulnerability

27 November 2019

nss vulnerability

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

  • Ubuntu 19.10
  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


NSS could be made to crash or run programs if it received specially crafted input.

Software Description

  • nss - Network Security Service library


It was discovered that NSS incorrectly handled certain memory operations. A remote attacker could use this issue to cause NSS to crash, resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 19.10
libnss3 - 2:3.45-1ubuntu2.1
Ubuntu 19.04
libnss3 - 2:3.42-1ubuntu2.3
Ubuntu 18.04 LTS
libnss3 - 2:3.35-2ubuntu2.5
Ubuntu 16.04 LTS
libnss3 - 2:3.28.4-0ubuntu0.16.04.8

To update your system, please follow these instructions:

After a standard system update you need to restart any applications that use NSS, such as Evolution, to make all the necessary changes.