For server admins, please check http://www.ubuntu.com/usn/usn-2232-1/
Very critical to update system if packages are not already up to date. Running the command:
dpkg-query -l libssl1.0.0
should show that the version installed is 1.0.1-4ubuntu5.14.
If not then you should run:
sudo apt-get update
sudo apt-get upgrade
To get your system up to date. At least this is not as bad as heartbleed in that I believe there is no need to generate new keys and get new certificate. But nevertheless critical to update immediately.
Cheers
Bob