Then go back and do it again, but this time play black-hat hacker. Get creative rather than methodical. Try sql statements everywhere that might touch a database. Hammer every communication method it uses with denial of service abuse and then crafty mis-information that only you know enough to design.
The point is, make a game of it and you'll enjoy it. You could always trade code with a co-worker and keep score of how many bugs you each find in eachother's code.
I think I'll go polish my tinfoil hat.
The extender connects to the phone network via ethernet. If your connection comes via WiFi, then a nearby rogue AP could hijack it and sniff the traffic.
"Engineering without management is art." -- Jeff Johnson