Apple has discovered a major security issue and has released a fix. Not all Apple devices will be affected, but if you have an iPhone, an iPad, or an Apple computer running the very latest Mac OS 10.9 (Mavericks), you should install any pending system updates as soon as possible.
For iPhones and iPads: From the home screen, go into “Settings” and then “General.” Select “Software Update,” and if there is an update, download and install it.
For Apple computers: First check your OS under the Apple menu, then “About This Mac.”
For OS 10.9.0 and up: The update has not yet been released, but is expected in the near future. Click on “Software Update…” under the OS X Version and if there are any updates, download and install them. If you are not seeing an update, please be sure to try again another day.
For OS 10.8.x and lower, you are not affected by this security issue, but should still keep up with updates: Click on “Software Update…” under the OS X Version. Do NOT click on the OS X Mavericks Free Upgrade. If you see any UPDATES, click on and install them.
Remember, it is important to keep up with minor updates on all your devices, especially ones that are security related. With major upgrades like Mac OS 10.8 to Mac OS 10.9 or Windows 7 to Windows 8, it is better to wait a while for stability and compatibility reasons. For these reasons, we do not recommend upgrading to 10.9 (Mavericks) at this time.
If you have any questions or problems, please contact the IT help desk, firstname.lastname@example.org or your school support specialist.