I was discussing the advantages/disadvatages of the different levels of wirelss security for 802.11 wirless networks. Someone said they leave theirs wide open because they dont feel anyone can do anything if they do pickup the signal outside his house. "What CAN they do?". I know you can port scan and look for vulnerabilites, but are there more serious and direct hacks where you can gain access?
What is possible once you are on the same router and subnet by picking up a stray signal?