Apple released Security Update 2007-004 for Mac OS X 10.3.9 and Mac OS X 10.4.9. The update addresses some 25 different issues for 19 different Mac OS X components. All of them are issues that would have potentially allowed either arbitrary code execution or a bad guy to gain access to your Mac with "escalated privileges."
The patch notes from Apple:
Security Update 2007-004 is recommended for all users and improves the security of the following components:
- AFP Client
- AirPort
- CarbonCore
- diskdev_cmds
- fetchmail
- ftpd
- gnutar
- Help Viewer
- HID Family
- Installer
- Kerberos
- Libinfo
- Login Window
- network_cmds
- SMB
- System Configuration
- URLMount
- Video Conference
- WebDAV
You can find detailed information on this patch at Appleis security site. The update weighs in at 10 MB.