How to fix the Bash bug on CentOS 6

Recently a critical bash bug was discovered.

To fix your CentOS 6 you have to check if you have a vulnerable bash installed. From a non root user, type:

 env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

If you read “vulnerable” as output then you have to update bash. Type su- and then the password to log in as superuser, then type:

 yum update bash

Type Y when asked. When the update process is completed, retype the test script:

 env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

And you shouldn’t read the “vulnerable” message anymore.

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