Researchers have discovered an attack on the Voice over LTE (VoLTE) mobile communications protocol that can break its encryption and allow attackers to listen in on phone calls. The attack leverages the use of encryption at the mobile cell tower, by sniffing the encrypted radio traffic of a call someone makes within the cell of a base station that uses vulnerable encryption methods. Researchers said they conducted real-world tests of the method on carrier base stations and found that it affects multiple mobile operators. They have notified the carriers of the vulnerability through the Coordinated Vulnerability Disclosure Program of the GSM Association.
Source: https://threatpost.com/revolte-attack-hackers-listen-mobile-calls/158325/