Master_Ghost_Knight wrote:*HACK THE PLANET*
Come on, mentions of hijacking user accounts without even talking about Spoofing, Token-based hijacking, or remote network monitoring protocols? Not a slight about SQL exploitation or the like?
Spoofing is, perhaps, the greatest tactic you could use in that situation other than a simple worm (and a Worm is a self-executing malicious program, usually with a design to infect an entire network of related persons via email, messages, etc.), and it is very difficult to defend against if I boot up BackTrack 5 and decide that your connection is better suited for someone of my stature and technical know-how.
I could simply ARP Spoof you and make your computer think that I'm the Router, and make the Router think that I'm your computer. Then run WireShark and just sit in the middle while your packets float around in Narnia for me to take, and capture the passwords out of.
As for typical MAC/IP Hijacking:
ifconfig wlan0 down
macchanger -m [your MAC address] wlan0
wlan0 successfully changed from [Old MAC Address] to [your MAC Address]
ifconfig wlan0 up
Then, it is simply a matter of breaking the router - that's the harder part of it all. WEP is cake, WPA/WPA2 requires Brute Forcing or other cool tricks to desalt the traffic flow - but it can still be done.
Now, once I have assigned myself your IP address and Spoofed your MAC address, I just connect to the router and kick you off with a resumed session. Your network access is now mine.
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There are so many tricks of the trade out there that it's ridiculous to only stop that conversation by saying "Worms" and "Cookies." Worms and Cookies are only the beginning to what's capable with your computer. Without writing any programs of your own, you can simply manipulate it to grant you access depending on your knowledge of networking topologies and the stupidity of whoever was setting up the router.
._.
Look into Backtrack 5 - NOW IN GNOME!
Some would insinuate that being drunk at 9 in the morning to be signs of serious issues.
Me? I'd insinuate it as signs of no plans and a refrigerator full of Whiskey and Guinness.