Linux: How to fix the Shellshock vulnerability.

About the Shellshock vulnerability, you can read here.
Run this command:

[mythcat@localhost ~]$ env x='() { :;}; echo vulnerable' bash -c 'echo hello'
hello

1 2	[mythcat@localhost ~]$ env x='() { :;}; echo vulnerable' bash -c 'echo hello' hello

If you see this:

vulnerable
hello

1 2	vulnerable hello

You have a Shellshock vulnerability, to fix use this:

[mythcat@localhost ~]$ sudo yum update

1	[mythcat@localhost ~]$ sudo yum update

Thank’s.