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In an earlier post we saw how GSM networks are jammed when the SMS traffic increases. Now some smart kids can use this loop hole to attack GSM networks and cause service outage in targeted areas. This is very much similar to DOS (Denial of service) attacks in computer networks.
Even though such a possibility exists, no one can bring down the entire service down. But its very much possible to bring down certain areas of a network, lets say an area covered by a tower.
The first step is collecting mobile numbers of subscribers in that area. Attacker can use many innovative schemes to collect mobile numbers. Some methods are described here.
Once you have enough numbers in a particular region or under a tower you can start sending SMS messages to all those numbers simultaneously. An SMPP gateway is needed for this. Many companies are providing gateways.
With the help of some spoofing techniques and zombie servers an attack can be launched quite easily. Zombie servers can bypass almost all operator spam detection mechanisms. In india, bulk sms is a huge market and I dont think there are any spam detection mechanisms implemented.
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