Apple has released security updates for Mac OS X 10.3.9 and 10.4.9 systems running on Intel or PowerPC-based Macs.

The company has also released software updates for QuickTime and for its recently-introduced AirPort Extreme Base Station.

The 15.7MB Security Update 2007-004 v1.1 (Universal) is recommended for all users and improves security across many system components, the company has confirmed. The release is for client and for server Macs and secures 18 areas of the OS, including Help Viewer, Video Conference and the Login WIndow.

The same update has also been made available for PowerPC-based Macs. This 9.1MB download is identical in function to the Intel Mac-focused software update, addressing the same vulnerabilities in the system

Finally, Apple has also shipped a version of the update for Mac users running Mac OS X 10.3.9. This addresses 16 system areas and is a 36.7MB download.

The updates are available using Software Update or for direct download form the Apple Support website.