Wifi worm: When the neighbour’s WLAN router sounds the attack
Not that I want to scare you away from the idea of an open free wireless meshed network (a mouthful), but something to keep in mind, although all still theoretical:
The epidemic model developed by the study’s authors - Hao Hu, Steven Myers, Vittoria Colizza and Alessandro Vespignani - suggests that several tens of thousands of routers could be infected with a worm within two weeks, most of them even within two days. To avoid the potential distribution of these so far only theoretical flying worms, users should be forced to change the default password of their router’s configuration interface and to enable WPA functionality with passwords which cannot be guessed.
Read on at Heise-Security.