Mac users may have been left out of the Shellshock kerfuffle over the past few days. Web servers are particularly at risk, because they often handle special functions such as searches using command scripts that are fed with data from external web requests. Macs famously use Bash as their default command shell, but most Macs arent running Linux. Apple has pushed out an update entitled OS X bash Update 1.0.0 for OS X users. You can check that the update worked by opening a Terminal window and issuing the bash -version command:”]
Source: https://nakedsecurity.sophos.com/2014/09/30/apple-patches-os-x-against-shellshock/