"Damn Vulnerable Linux does exactly what it says on the tin.
According to this distribution's website, 'Damn Vulnerable Linux
(DVL) is everything a good Linux distribution isn't. Its developers
have spent hours stuffing it with broken, ill-configured, outdated
and exploitable software that makes it vulnerable to attacks'.
"Strange? No. The idea behind this distribution is to train
Linux admins — and what better way to train someone than to
hand them a broken distribution to fix? Older or broken versions of
Apache, MySQL, PHP, FTP, and SSH might present your admins in
training with too many problems.'"