USN-1540-1: NSS vulnerability

16 August 2012

nss vulnerability

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

  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS


NSS could be made to crash if it opened a specially crafted certificate.

Software Description

  • nss - Network Security Service library


Kaspar Brand discovered a vulnerability in how the Network Security Services (NSS) ASN.1 decoder handles zero length items. If the user were tricked into opening a specially crafted certificate, an attacker could possibly exploit this to cause a denial of service via application crash.

Update instructions

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

Ubuntu 11.10
libnss3-1d - 3.12.9+ckbi-1.82-0ubuntu6.1
Ubuntu 11.04
libnss3-1d - 3.12.9+ckbi-1.82-0ubuntu2.2
Ubuntu 10.04 LTS
libnss3-1d - 3.12.9+ckbi-1.82-0ubuntu0.10.04.4

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.