You may already know this but…
There is a widespread Linux vulnerability known as ‘Shell shock’ or ‘bash bug’ exploit published this week…
Many Linux distributions are vulnerable including Debian on which Raspbian is based.
There is no need for panic if your system is not accessible to the outside world - although the fix is so easy to apply that everyone should apply it.
raspberrypi.org/forums/viewt … 66&t=87812 has the story.
sudo apt-get update
sudo apt-get upgrade