By analyzing signals data, the report by Washington-based Exigent Media found that Beijing, working through state-owned telecom operator China Unicom, was the leading source of attacks against U.S. mobile users over 3G and 4G networks in 2018.
The regime exploited well-known network vulnerabilities, which allowed it to track, monitor, disrupt, and intercept communications of U.S. phone subscribers while they traveled abroad. The vulnerabilities are centered around the legacy mobile SS7 signaling system, described in the report as “a patchwork system enabling network operators around the world to communicate with each other for international roaming services.”
The Chinese cyberattacks targeted tens of thousands of U.S. mobile users from 2018 to 2020, Gary Miller, the report’s author and a former mobile network security executive, told The Guardian. Via – The Epoch Times