USN-1763-1: NSS vulnerability

14 March 2013

nss vulnerability

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS


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

Software Description

  • nss - Network Security Service library


Nadhem Alfardan and Kenny Paterson discovered that the TLS protocol as used in NSS was vulnerable to a timing side-channel attack known as the “Lucky Thirteen” issue. A remote attacker could use this issue to perform plaintext-recovery attacks via analysis of timing data.

Update instructions

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

Ubuntu 12.10
libnss3 - 3.14.3-0ubuntu0.12.10.1
Ubuntu 12.04 LTS
libnss3 - 3.14.3-0ubuntu0.12.04.1
Ubuntu 11.10
libnss3 - 3.14.3-0ubuntu0.11.10.1
Ubuntu 10.04 LTS
libnss3-1d - 3.14.3-0ubuntu0.10.04.1

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.