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There is an easy test to determine if a Linux or Unix system is vulnerable. To check your system, from a command line, type:
$ env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
If the system is vulnerable, the output will be:
vulnerable
this is a test
If you're safe, it will throw an error;
bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'
this is a testenv
pedro@pedro-bedro2:~$ env x='() { :;}; echo vulnerable' bash -c "echo this is a test"
bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x'
this is a test
pedro@pedro-bedro2:~$
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