Mac users running Mac OS X Tiger were treated with a security update last night.
The update is available for both Intel and for PowerPC-based Macs running Apple's older OS. The company recommends all Tiger users install the software, which is available through Software Update or for direct download from Apple's website.
The update patches a buffer overflow in Directory Services that could allow a local user to execute arbitrary code with system privileges. The way Safari handles URLs has also been changed by performing additional validation of URLs.
When an application has been uninstalled from the system, Launch Services may allow it to be launched if it is present in a Time Machine backup. This update addresses the issue by not allowing applications to be launched directly from a Time Machine backup.
Many other patches exist within this update.