USN-2606-1: OpenSSL update

12 May 2015

openssl update

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

  • Ubuntu 12.04 LTS


OpenSSL TLSv1.2 client support has been enabled in Ubuntu 12.04 LTS.

Software Description

  • openssl - Secure Socket Layer (SSL) cryptographic library and tools


For compatibility reasons, Ubuntu 12.04 LTS shipped OpenSSL with TLSv1.2 disabled when being used as a client.

This update re-enables TLSv1.2 by default now that the majority of problematic sites have been updated to fix compatibility issues.

For problematic environments, TLSv1.2 can be disabled again by setting the OPENSSL_NO_CLIENT_TLS1_2 environment variable before library initialization.

Update instructions

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

Ubuntu 12.04 LTS
libssl1.0.0 - 1.0.1-4ubuntu5.27

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.