USN-3163-1: NSS vulnerabilities

4 January 2017

nss vulnerabilities

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

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in NSS.

Software Description

  • nss - Network Security Service library

Details

It was discovered that NSS incorrectly handled certain invalid Diffie-Hellman keys. A remote attacker could possibly use this flaw to cause NSS to crash, resulting in a denial of service. This issue only applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-5285)

Hubert Kario discovered that NSS incorrectly handled Diffie Hellman client key exchanges. A remote attacker could possibly use this flaw to perform a small subgroup confinement attack and recover private keys. This issue only applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-8635)

Franziskus Kiefer discovered that NSS incorrectly mitigated certain timing side-channel attacks. A remote attacker could possibly use this flaw to recover private keys. (CVE-2016-9074)

This update refreshes the NSS package to version 3.26.2 which includes the latest CA certificate bundle.

Update instructions

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

Ubuntu 16.10
libnss3 - 2:3.26.2-0ubuntu0.16.10.1
Ubuntu 16.04 LTS
libnss3 - 2:3.26.2-0ubuntu0.16.04.2
Ubuntu 14.04 LTS
libnss3 - 2:3.26.2-0ubuntu0.14.04.3
Ubuntu 12.04 LTS
libnss3 - 2:3.26.2-0ubuntu0.12.04.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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.

References