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‘Bash Bug’ giving you Shellshock? CVE-2014-6271 update

The media train is in full steam today over the the CVE-2014-6271 programming flaw, better known as the “Bash Bug” or “Shellshock” – the original problem was disclosed on Wednesday via this post. Firstly this issue exploits bash environment variables in order to execute arbitrary commands; a simple check for this per the Red Hat security blog is the following:

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

If you see an error:

bash: warning: x: ignoring function definition attempt
bash: error importing function definition for `x’

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