Introduction

You now have hardened your system using open source tools. Changes are constantly made to production systems. In addition, malicious users are constantly discovering and exploiting new weaknesses. This chapter discusses ways to scan your systems for weaknesses that may already exist or may develop. You will learn how to scan your hard drive, and then scour running processes to determine if any problems exist.

Finally, you will learn how to deploy the Nessus scanner to test for common server weaknesses. By the end of this chapter, you will have a system that is reasonably secure, and can actually test additional servers for vulnerabilities.