GHOST: glibc vulnerability (CVE-2015-0235) - How to fix the issue in Ubuntu and Red Hat

In Linux Ubuntu, the easy way to fix is update your library to the following version:

• Ubuntu 12.04 LTS:  libc6 2.15-0ubuntu10.10

• Ubuntu 10.04 LTS:  libc6 2.11.1-0ubuntu7.20

Follow the command below to update the Ubuntu library

$ sudo apt-get update
$ sudo apt-get dist-upgrade

In Linux Red Hat, the easiest way to resolved the issue is to update the glibc and nscd  packages on your system using the package release with the following errata: 

• Red Hat Enterprise Linux 5 (server, client)
• Red Hat Enterprise Linux 6, 7 (server, workstation, desktop)