I'm not sure where you're getting your information that UNC is working on a Moodle implementation--when I asked UNC's ITS in a Student Technology Advisory Board meeting they replied that they're currently doing a Sakai trial but are not looking into Moodle.

I'll let MacWorld say it for me:
From http://www.macworld.com/news/2006/09/21/wireless/i ndex.php:
Apple on Thursday released a Security and AirPort update for Mac OS X that fixes vulnerabilities found in the company's wireless drivers. Apple said the issues found were the result of an internal audit of the software drivers and that no known exploits exist for the issues addressed in this update.
...
Apple has maintained that SecureWorks has provided no proof that Mac drivers are vulnerable in any way.
"They did not supply us with any information to allow us to identify a specific problem, so we initiated an internal audit," Apple spokesman, Anuj Nayar, told Macworld. "Today's update preemptively strengthens our drivers against potential vulnerabilities, and while it addresses issues found internally by Apple, we are open to hearing from security researchers on how to improve security on the Mac."