On Fri, Jul 22, 2011 at 19:48, Gloria Mazzi mazzi.teodolinda.gloria@gmail.com wrote:
Hi all,
as stated on OsmocomSecurity: "A malicious attacker knowing the IMSI or TMSI of a victim can thus send hand-crafted IMSI DETACH messages to a cell, causing the network to assume the MS is no longer present in the network.This will effectively prevent the delivery of all mobile-terminated (MT) services, such as SMS, voice calls, CSD, ...".
Following the theory i've better understood how it works [1]*, but still i have some questions for you:
- what could happen if i will clone one SIM (Ki, IMSI) and use it to
register on the same network, but on different BTS/LAC, two phones? Which will be rejected as first? Or both?
I can't tell about this attack, but from my experience with using cloned SIM-cards in the real network, The last phone who did a call receives incoming calls. If this (last active) phone is turned off then the second phone doesn't receive incoming calls at all until it does something. And I think this is a natural behavior, because it may happen that some phone loose its battery, then you take SIM off and insert in an other phone, and it should work - and the case with two cloned SIM-cards looks about the same to an operator.
PS To make it clear, I cloned my own SIM-cards, because I used multi-SIM card with several numbers on a single SIM. So nothing really illegal.