Botnet4Lunch·há 6 anos·discussHmm I don't remember that ever being true. Items like Postgress would listen on localhost only. No services outside of DHCP were even enabled by default going all the way back to BackTrack.
Botnet4Lunch·há 6 anos·discusshttps://kali.trainingThats free, and a great place to start if you are not sure if this field is right for you. Only needs a time investment.