The Bash Vulnerability: How to Protect your Environment

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A recently discovered hole in the security of the Bourne-Again Shell (bash) has the majority of Unix/Linux (including OS X) admins sweating bullets. You should be, too–attackers have already developed exploits to unleash on unpatched web servers, network services and daemons that use shell scripts with environment variables (this can include network equipment, industrial devices, etc.)

Source: The Bash Vulnerability: How to Protect your Environment