“If you can’t exploit it, you can’t secure it. I don’t know if
that quote has been said before, but if you are deeply interested
about computer security or ethical hacking, that should be your
main mantra. To fully learn how to secure a computer program, you
must know how to break it and find vulnerabilities. In relation to
this, there is a unique Linux distribution that is primarily
created to help teach you about software security, its name is Damn
Vulnerable Linux (DVL).“Damn Vulnerable Linux is a Slackware-based distro that is
intentionally loaded with broken, ill-configured, outdated, and
exploitable software for educational purposes. It is a 1.8GB live
DVD that features easily breakable versions of Apache, MySQL, PHP,
and FTP and SSH daemons.”