USN-3270-1: NSS vulnerabilities

27 April 2017

nss vulnerabilities

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


Several security issues were fixed in NSS.

Software Description

  • nss - Network Security Service library


Karthik Bhargavan and Gaetan Leurent discovered that the DES and Triple DES ciphers were vulnerable to birthday attacks. A remote attacker could possibly use this flaw to obtain clear text data from long encrypted sessions. This update causes NSS to limit use of the same symmetric key. (CVE-2016-2183)

It was discovered that NSS incorrectly handled Base64 decoding. A remote attacker could use this flaw to cause NSS to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-5461)

This update refreshes the NSS package to version 3.28.4 which includes the latest CA certificate bundle.

Update instructions

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

Ubuntu 17.04
libnss3 - 2:3.28.4-0ubuntu0.17.04.1
Ubuntu 16.10
libnss3 - 2:3.28.4-0ubuntu0.16.10.1
Ubuntu 16.04 LTS
libnss3 - 2:3.28.4-0ubuntu0.16.04.1
Ubuntu 14.04 LTS
libnss3 - 2:3.28.4-0ubuntu0.14.04.1

To update your system, please follow these instructions:

This update uses a new upstream release, which includes additional bug fixes. 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.