In less than a month we have seen two iPhone worms (discovered) and here comes the third and most dangerous one. While the first one iKee was just a security warning, (friendly hack) the other one (iPhone/Privacy.A) we saw was able to steal data from your iPhone. If these were not enough to make you think about mobile security seriously, then you are set for a rude awakening.
The latest malware affecting the Jesus phone tricks the compromised iPhone to ask the user to input ING (Dutch online bank) details. While this exploit is only known to have affected Netherlands, this can spread via WiFi. And in my opinion there are many such unknown, unheard malicious piece of softwares going around, it is only a matter of time when we start hearing of them on a day to day basis. For the moment, we should be happy that companies like F-Secure have unearthed such scams.
The only known way to currently safeguard your jailbroken (SSH enabled) iPhones / iPod touch is to change the root password after you jailbreak. You can refer to our guide on the same.