How to find and fix Bash Shell-shock vulnerability CVE-2014-6271 in unix like system

type command - env x=‘() { :;}; echo vulnerable‘ bash -c ‘echo hello‘

in your terminal.

if your system is vulnerable then above command will return output like above

vulnerable hello

all the Debian /Ubuntu user to patch it kindly update your bash to latest version

run bash --version command to know your currently installed version
run- sudo apt-get update && sudo apt-get install –only-upgrade bash

if your system is alread updated then just simply upgrade your bash version by running this command

sudo apt-get install --only-upgrade bash

http://vtechcoder.blogspot.in/2014/09/how-to-find-and-fix-bash-shell-shock.html