Researchers claim to have discovered a vulnerability with the sandbox security mechanism used by Apple.
The sandbox, which is baked into the kernel of Mac OS X, is designed to apply application restrictions, so that code that has no reason to access a network isn't able to access a corporate LAN or the internet, for example.
The restriction means that even if the code contains bugs, hackers will be stuck if they try to exploit the vulnerability to do anything else. All applications published through the App Store "must implement sandboxing" by the start of March 2012.
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