Anatomy of a killer bug: How just 5 characters can murder iPhone, Mac apps

http://en.wikipedia.org/wiki/Twitter

There has been much sniggering into sleeves after wags found they could upset iOS 6 iPhones and iPads, and Macs running OS X 10.8, by sending a simple rogue text message or email.

A bug is triggered when the CoreText component in the vulnerable Apple operating systems tries to render on screen a particular sequence of Unicode characters: the kernel reacts by killing the running program, be it your web browser, message client, Twitter app or whatever tried to use CoreText to display the naughty string.

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Story added 4. September 2013, content source with full text you can find at link above.