USN-2063-1: NSS vulnerability

20 December 2013

nss vulnerability

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

  • Ubuntu 13.10
  • Ubuntu 13.04
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS


Fraudulent security certificates could allow sensitive information to be exposed when accessing the Internet.

Software Description

  • nss - Network Security Service library


It was discovered that an intermediate certificate was incorrectly issued by a subordinate certificate authority of a trusted CA included in NSS. This intermediate certificate could be used in a man-in-the-middle attack, and has such been marked as untrusted in this update.

Update instructions

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

Ubuntu 13.10
libnss3 - 2:
Ubuntu 13.04
libnss3 - 2:
Ubuntu 12.10
libnss3 -
Ubuntu 12.04 LTS
libnss3 -
Ubuntu 10.04 LTS
libnss3-1d -

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.