Security Basics: Path Traversal

Imagine you’re a thief (you can be the Robin Hood type if that helps) going into a business, looking for loot. You scour the storefront, and find nothing. You see a doorway to some stairs, and decide to see if you can go one floor down. You make it down one flight and check the knob — click click. It’s locked. You go down another flight, same deal. You keep moving down and checking knobs until, finally, you find an open door. Inside…