Apple has released a security update for Mac OS X titled simply "Security Update 2003-08-14." The update is intended to fix a security hole that could allow someone to take over your Mac, though Appleis update note is a bit geeky in its explanation:
Security Update 2003-08-14 addresses a potential vulnerability in the fb_realpath() function which could allow a local or remote user to gain unauthorized root privileges to a system.
You can download the update through the Software Update Control Panel in Mac OS X. As of this writing, Apple does not seem to have posted the update as a standalone download, nor has they company yet posted a Knowledge Base article on it. Those usually follow as much as a day or two after an update is released through the Software Update service.
We strongly recommend that users install this update. It weighs in at 1.1 MB, and does require a restart.