Even though most people are now aware of the Shellshock security problem on the bash shell, here is a test to check whether your Unix system is at risk:
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env x='() { :;}; echo vulnerable’ bash -c ‘echo hello’
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if the prompt returns vulnerable, it means the system is vulnerable and needs to be upgraded with the proper security patch… For instance running
[sourcecode language=”bash” gutter=”false”]
sudo apt-get update && sudo apt-get install –only-upgrade bash
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for Debian/Ubuntu versions. Check Apple support page for Apple OS.
