With the increasingly widespread usage of more sophisticated mobile devices the attack surface is increasing, but we still haven't seen many threats that are successful at attacking mobile devices directly, for example through Bluetooth or the device's Internet connection. I think an attack on mobile devices will be most likely to originate from Web sites targeting a vulnerability in the device's browser. Attackers already try to compromise multiple browsers from a single site, consider for example drive-by downloads, iframes, etc., so adding an exploit targeting a vulnerability in a mobile device browser to the same site would be easy enough.
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