Also, you can learn a lot about security in general by looking at the existing tools and learning how they work. These tools will scan your system for security problems such as world writable directories and file permissions. There are also usually checks related to SUID files. Nmap, hping and Firewalk are a little different in that they aren't as much for vulnerability scanning as for gaining information. Password Checkers Passwords are key to the security of a system.
Good passwords are key to good security.
These tools will test the security of your passwords, attempting to guess the passwords of your users. You need this makefile for Red Hat 5.0 and higher. Buffer Overflows Buffer overflows are the most common security problems. Buffer Overflow Protection Keep up to date with security related patches. An untrusted host impersonates a trusted host, then exploits the gained trust, ususally to make the untrusted host into a trusted one.