As promised, Apple has released an update for OS X Lion, Mountain Lion, and Mavericks that patches a security flaw exploited by a hack called Shellshock. While Shellshock only affects Mac users who manually set up advanced UNIX services, it’s still a serious enough flaw for Apple to address.
OS X bash Update 1.0 is available for download from Apple’s website now, and it should start appearing in the Mac App Store’s updates section any moment. All Mac users running a version of OS X prior to Yosemite are recommended to download the update.
Source: Apple
