Apple has posted Security Update 2007-004 via its Software Update pane and on the Web. The company says this update is recommended for all users and improves the security of the following: 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, and WebDAV.