Get root on an OS X 10.10 Mac: The exploit is so trivial it fits in a tweet
You can bypass Apple's space-age security and gain administrator-level privileges on an OS X Yosemite Mac using code that fits in a tweet.
Yosemite, aka version 10.10, is the latest stable release of the Mac operating system, so a lot of people are affected by this vulnerability. The security bug can be exploited by a logged-in attacker or malware on the computer to gain total unauthorized control of the Mac. It is documented here by iOS and OS X guru Stefan Esser.
It's all possible thanks to an environment variable called DYLD_PRINT_TO_FILE that was added in Yosemite. It specifies where in the file system a component of the operating system called the dynamic linker can log error messages.
