Among the plethora of built-in OS X features that help keep your Mac secure is something called File Quarantine, a download validation technology that checks any downloads for known malware when you try to open them.
File Quarantine is also available in compatible applications like Safari, Messages, iChat and Mail that download files from the Internet or receive files from external sources, such as email attachments.
Additionally, OS X blocks compromised versions of web plug-ins from functioning, including Java web apps and Adobe Flash content, to further limit your Mac's exposure to potential zero day exploits.
In this tutorial, we'll discuss how you can make sure that File Quarantine updates are turned on, which will allow your Mac to receive latest malware definitions and information about compromised web plug-ins from Apple.