A couple of guys are gong to present a way to install malware on an iPhone at BlackHat 2013. Apparently Apple can install secret software using their charger. Now these guys can too. They built a cheap prototype that does just that. I can see how this would make it easy to infect an iPhone or iPad. People ask to use my iPhone charger all the time. I could just say, "No problem." Then I laugh as they get the payload.
I guess it just goes to show you that you can't trust anything these days. As a side note, there seem to be a number of talks addressing how to hack into mobile devices. It is not just limited to Apple products. This is probably due to mobile being hot right now.