![]() ![]() Thus, it is still a required and significant work to study and fix the security and privacy problems in low-generation (compared to 5G) cellular networks. IntroductionĥG/NR (New Radio), which has driven many new technologies like edge computing, now has been designed to gradually replace current mobile networks, such as 4G/LTE (Long Term Evolution), 3G/UMTS (Universal Mobile Telecommunications System), and 2G/GSM (Global System for Mobile Communications), but these remainders will still be used widely for a pretty long time due to the existing enormous mobile network infrastructures and terminals of 2G/3G/4G currently, just like 2G and 3G have coexisted with 4G networks for many years by far. Several potential countermeasures are also discussed to temporarily or permanently defend the attack. Hence, we hope the operators worldwide can completely disable the GSM mobile networks in the areas covered by 3G and 4G networks as soon as possible to reduce the possibility of attacks on higher-generation cellular networks. Moreover, we demonstrated that anyone with basic programming skills and the knowledge of GSM/LTE specifications can easily build a phone number catcher using SDR tools and commercial off-the-shelf devices. This paper intends to verify that mobile privacy is also quite vulnerable even in LTE networks as long as the legacy GSM still exists. We caught the LTE user’s phone number within a few seconds after the device camped on our rogue station. Based on the above facts, with the help of an IMSI catcher and 2G man-in-the-middle attack, this paper implemented a practicable and effective phone number catcher prototype targeting at LTE mobile phones. ![]() ![]() However, the mobile network may send a user’s phone number to another mobile terminal when this user initiating a call or SMS service. Unlike the IMSI, a mobile device never transmits its own phone number to the network side in the radio. Phone number is a unique identity code of a mobile subscriber, which plays a more important role in the mobile social network life than another identification number IMSI. ![]()
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January 2023
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