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.

Apple just released updates to squelch the bash UNIX shell exploit. The updates close a security hole that allowed hackers to remotely take over a computer using SSH (Secure Shell, a networking protocol). The exploit does require that a computer be available on the internet (like a web server) so most users are not in immediate danger of having their computers hijacked. The exploit is also know by the name Shellshock. Probably because it uses shell access and it sounds more dangerous that bash exploit. Bash is a UNIX command shell built into OS X as well as other UNIX based systems including Linux, Red Hat, Debian and Ubuntu. Updates for Lion, Mountain Lion and Mavericks are available now.

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