USN-3336-1: NSS vulnerability

Ubuntu Security Notice USN-3336-1

21st June, 2017

nss vulnerability

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


NSS could be made to crash if it received specially crafted network traffic.

Software description

  • nss - Network Security Service library


It was discovered that NSS incorrectly handled certain empty SSLv2
messages. A remote attacker could possibly use this issue to cause NSS to
crash, resulting in a denial of service.

Update instructions

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

Ubuntu 17.04:
libnss3 2:3.28.4-0ubuntu0.17.04.2
Ubuntu 16.10:
libnss3 2:3.28.4-0ubuntu0.16.10.2
Ubuntu 16.04 LTS:
libnss3 2:3.28.4-0ubuntu0.16.04.2
Ubuntu 14.04 LTS:
libnss3 2:3.28.4-0ubuntu0.14.04.2

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 and Chromium, to make all the necessary