Shellshock Bash vulnerability fix for Ubuntu & Debian Linux (also MACs)
You can upgrade to the latest .deb on precise until utopic and get it fixed:
Run:
env x='() { :;}; echo vulnerable' bash -c 'echo hello' ;
apt-get update;
apt-get -y install bash;
env x='() { :;}; echo vulnerable' bash -c 'echo hello'
Detailed Proof of the Fix: