In one of his tests, performed on a Nexus 4 with the screen unlocked and running Android 4.3, after receiving around 30 class 0 messages, the phone did not respond to taps or attempts to lock the screen. While in that state, the phone was unable to take incoming calls; a manual reboot was necessary. Overall, he said that he found Nexus phones –the Galaxy Nexus, Nexus 4, and Nexus 5—to be vulnerable to multiple SMS attempts which may force the phones to reboot or lose connectivity. The mischief is accomplished if the attacker sends around 30 Flash SMS messages to the phone. (He wanted to see what would happen if sending multiple messages to a device at short intervals.)
Flash SMS messages are displayed on the screen and with this type of exploit, the user who ignores the messages without saving or dismissing actions at once may see the phone lose connectivity or reboot.
According to reports, Alecu contacted Google about the issues. Is it only happening with Nexus phones? Alecu said he tried the attack on other devices with no such results. This does not mean the exploit would be impossible to carry out on smartphones from other vendors but so far he was only able to confirm such effects on Nexus phones. According to PCWorld, “We thank him for bringing the possible issue to our attention and we are investigating,” said a Google representative via email.
Read more at: Phys.org