Go to the Software Update panel in System Preferences to grab the latest system software security update, a 5.2MB download. From the Read Me:

Security Update 2002-08-02 includes the following updated components which provide increased security to prevent unauthorized access to applications, servers, and the operating system.

Apache v1.3.26
OpenSSH v3.4p1
OpenSSL v0.9.6e
SunRPC
mod_ssl v2.8.10

Installing the security update does require a restart... [Mac Net Journal]