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Shellshock Vulnerability: Easy Security Check For Your Mac
Martin Sitter on Thu, September 25th 1 comments
Your Apple computer is probably susceptible to the Shellshock vulnerability. Use this simple check to see if you're computer is vulnerable ...
Shellshock is a bug in UNIX that affects Mac OS. You can quickly check to see if your computer is vulnerable by running this command in Terminal:

env x='() { :;}; echo vulnerable' bash -c 'echo hello'

shellshock terminal command line prompt

Oh shoot ... my laptop is vulnerable. Please Apple, put out an OS update soon ...

If your computer returns "vulnerable" after you run the command ... well, the answer is obvious. And there's not much you can do about it other than turning on your built-in firewall and hoping for the best.

Security & Preferences Firewall

Visit System Preferences > Security & Privacy Pane and turn on your firewall!  I use it always ... 

You can also be proactive in protecting yourself: until Shellshock is patched, you should avoid using open networks in public spaces. You're quite safe using the internet at home or your office ... no need to panic. It's difficult for people to exploit Shellshock if they're not on your network. 

While this bug isn't per-se Apple's fault (it affects UNIX itself, which Mac OS is built on), they still need to fix it quickly. Check your Software Updates soon as I'm sure it will be fixed soon ... though as of writing there's no security patches available for OS 10.9 Mavericks or below.

How to find terminal application

Command-Spacebar and search for "Terminal" to quickly launch it. Don't try directory-diving to find this well-hidden application.

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  • pointadnb
    $ mkdir bash-fix $ cd bash-fix $ curl | tar zxf - $ cd bash-92/bash-3.2 $ curl | patch -p0 $ cd .. $ xcodebuild $ sudo cp /bin/bash /bin/bash.old $ sudo cp /bin/sh /bin/sh.old $ build/Release/bash --version # GNU bash, version 3.2.53(1)-release $ build/Release/sh --version # GNU bash, version 3.2.53(1)-release $ sudo cp build/Release/bash /bin $ sudo cp build/Release/sh /bin
    • 6 years ago
    • By: pointadnb
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