How do you know whether you are involved in newly discovered bash security hole?
Try this in your shell
env x='() { :;}; echo Dangerous' bash -c "echo This is a test for your bash"
And if you see Dangerous in your shell, you'd better take action as soon as possible. Imagine that if the code is env x='() { :;}; rm -rf /' bash -c "echo Goodbye!" So, you may want to do those following steps
apt-get update
apt-get upgrade
or you can upgrade bash only
apt-get install --only-upgrade bash
After upgrade, if you execute that command, bash will echo you something like this
bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'