Android Smartphones: Ussd Calls Can Kill Sim Cards

snoopy · Sep 28, 2012

Android smartphones: USSD calls can kill SIM cards

heise Security's SIM card was locked after they opened the page. The dialog reads "Your SIM card has been locked with a PUK code. To unlock it enter the PUK code." Zoom The fact that Android smartphones automatically use injected USSD codes is becoming a bigger problem. Samsung devices are not the only ones affected, with attackers also being able to disable SIM cards in certain HTC mobile phones.

The H's associates at heise Security managed to set up a test page that sends a particular USSD command, along with an incorrect PIN, to a smartphone's telephone module multiple times. The SIM card in an HTC One XL was locked immediately after the test page had been opened. To unlock it, a user is supposed to enter the PUK code – theoretically, though, they could have taken it even further and prepared the page in such a way that it also entered an incorrect PUK ten times, which would have locked the card completely. They were also able to replicate the problem with a Motorola RAZR XT910; the SIM card was locked immediately after opening the test page.
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Story & screenshot -
http://www.h-online.com/security ews/item/Android-smartphones-USSD-calls-can-kill-SIM-cards-1719230.html

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