2017/06/09 @ SSTIC 2017
VoLTE (Voice over LTE) is a technology implemented by many operators over the world. Unlike previous 2G/3G technologies, VoLTE offers the possibility to use the end-to-end IP network to handle voice communications. This technology uses VoIP (Voice over IP) standards over IMS (IP Multimedia Subsystem) network.
In this paper, we will first introduce the basics of VoLTE technology. We will then, demonstrate how to use an Android phone, to communicate with VoLTE networks and what normal VoLTE communications look like. Finally, we will describe different issues and implementations problems. We will present vulnerabilities, both passive and active, and attacks that can be done using VoLTE Android smartphones to attack subscribers and operators infrastructure.
Some of these vulnerabilities are new and not previously disclosed: they may allow an attacker to silently retrieve private pieces of information on targeted subscribers, such as their geolocation