Apple has released a Security Update labelled "2005-005", through the Software Update utility and through its support web site.
Here is the description provided by Apple:
Security Update 2005-005 delivers a number of security enhancements and is recommended for all Macintosh users. This update includes the following components:
Apache
AppKit
AppleScript
Bluetooth
Finder
Foundation
Help Viewer
lukemftpd
sudo
Terminal
VPN
X11
This update works only on Mac OS X Panther. More details can be found here.

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