Apple has distributed Security Update 2003-06-09.
According to the release notes included with the distribution, the new security update addresses a potential problem that arises when the Apple Filing Protocol, or AFP, is used to reshare a Network File System (NFS) mount. Also addressed in this update is a potential situation that causes LDAP bind authentication requests to be improperly sent when using Kerberos authentication.
The 1.4MB file is available for download through the Software Update System Preferences pane.