GSM sniffing и hacking № 2

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GSM sniffing и hacking № 2

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GSM sniffing и hacking № 2

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I have been working on Telecom Security and Software defined radio since a few months and I noticed that there are very limited resources on the internet for beginners who want to get into telecom security. Not many people from security industry are into this and very less information has been shared online. I would be sharing here whatever I have gained in past few months in a series of blog posts. According to Wikipedia, Software-defined radio SDR is a radio communication system where components that have been typically implemented in hardware e. In simple terms, It refers to a technique in which all the processing is done in software. The processing mentioned include mixing, filtering, demodulation etc. We can use a SDR to capture airwaves when tuned to a particular frequency. The range of frequency it can capture and the bandwidth differs with different SDR devices. GSM operates on a set of pre-defined frequencies designated by International Telecommunication union for the operation of GSM mobile phones. In India, we use two bands which are shaded in yellow in the above picture. For sniffing, first we need to identify the GSM downlink channels. Here we would be sniffing GSM data for our own phone so we would need to know upon what frequency it is operating on. In GSM cellular networks, an absolute radio-frequency channel number ARFCN is a code that specifies a pair of physical radio carriers used for transmission and reception in a land mobile radio system, one for the uplink signal and one for the downlink signal. They are using different encoding and encryption schemes and we can cover them later. We can clearly see the GSM Stream bits on that frequency. This will give us confirmation about our downlink channel. We can use kalibrate-rtl tool to scan GSM frequencies around us. Here also we can see our downlink channel and it also gives us the offset value which will help us calibrate our SDR better. Whatever data which the SDR is receiving is just raw data which makes no sense. Now start wireshark simultaneously and we would start seeing the GSM data packets in the wireshark. We can also filter out Gsmtap packets. This is a system Information type 3 packet. Information needed by the MS for cell selection and reselection is broadcasted with the help of this. All the data channels are almost always encrypted using a stream cipher A5 used to provide over-the-air communication privacy in the GSM cellular telephone standard. We can only see some of the control channels above which were not encrypted. All the calls and messages are encrypted using an encryption key Kc which is generated after an authentication mechanism by Authentication Center AUC which follows a challenge-response authentication model. The Ki or Kc is never exchanged over network, therefore making it impossible to sniff encryption keys over the air. Moreover, the Kc changes before each call is setup. It means for every call, there would be a different encryption key. However, older version of A5 can be cracked if we have enough computation power. Kraken is the tool that can be used for this. Even if the operator is using new and strong encryption algorithm, sometimes It is possible to force the operator to switch to a weaker encryption algorithm. During telecom security vulnerability assessments, it was found that, sometimes operators turn off encryption schemes completely when the load on the network increases so that they can reduce overhead traffic and can accommodate more users easily. This is the most common attack vector that have been used since years by different hacker groups and Intelligence agencies. One can create fake cell towers and fool a mobile station in the vicinity to connect to that fake cell tower. All the mobile station data now would be going through that fake cell tower and the person in control could force the MS to use no encryption at all. In , It was in the news that some spies hacked into the internal computer network of the largest manufacturer of SIM cards in the world, stealing encryption keys Ki used to protect the privacy of cellphone communications across the globe. This key could be used to decrypt the GSM data. Stay Tuned. What is a SDR? GSM frequency bands. Gqrx tool. Location Update message.

GSM sniffing и hacking № 2

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