@fixit_f

To be fair, none of the systems were compromised until it got to the "assume a user has just browsed to your website, with flash enabled" stage of the competition, and all of the machines were vulnerable to the flash exploit.

Although this is just another way of saying ubuntu is quite secure; unlike XP (and possibly the mac), ubuntu doesn't ship with a firewall on, which can wallpaper over vulnerabilities (a firewall only protects you up until you need to actually _allow_ anonymous access to a service)