USN-2864-1: NSS vulnerability

7 January 2016

nss vulnerability

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

  • Ubuntu 15.10
  • Ubuntu 15.04
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


NSS could be made to expose sensitive information over the network.

Software Description

  • nss - Network Security Service library


Karthikeyan Bhargavan and Gaetan Leurent discovered that NSS incorrectly allowed MD5 to be used for TLS 1.2 connections. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could be exploited to view sensitive information.

Update instructions

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

Ubuntu 15.10
libnss3 - 2:
Ubuntu 15.04
libnss3 - 2:
Ubuntu 14.04 LTS
libnss3 - 2:
Ubuntu 12.04 LTS
libnss3 -

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 changes.