Mac bash upgrade to mitigate the Shellshock exploit

bashup.sh

# shellshock upgrade & patch for Mac OSX
# OSX ships with a horribly old version of bash (3.2) which is vulnerable to 
# the Shellshock exploit (CVE-2014-6271)
# We use homebrew to get a recent version of bash, then symlink it to
# /bin/bash and /bin/sh (because sh is really bash)
#
# Use this to see if you're vulnerable
# env X="() { :;} ; echo vulnerable" /bin/bash -c "echo testing"

brew update && brew install bash
cd /bin
sudo mv bash bash.old
sudo ln -s /usr/local/bin/bash
sudo mv sh sh.old
sudo cp bash sh

if you already have bash installed via homebrew, just brew update && brew upgrade bash