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IPv6 is being more and more adopted, in part to facilitate the millions ofsmart devices that have already been installed at home. Unfortunately, we findthat the privacy of a substantial fraction of end-users is still at risk,despite the efforts by ISPs and electronic vendors to improve end-usersecurity, e.g., by adopting prefix rotation and IPv6 privacy extensions. Byanalyzing passive data from a large ISP, we find that around 19% of end-users'privacy can be at risk. When we investigate the root causes, we notice that asingle device at home that encodes its MAC address into the IPv6 address can beutilized as a tracking identifier for the entire end-user prefix -- even ifother devices use IPv6 privacy extensions. Our results show that IoT devicescontribute the most to this privacy leakage and, to a lesser extent, personalcomputers and mobile devices. To our surprise, some of the most popular IoTmanufacturers have not yet adopted privacy extensions that could otherwisemitigate this privacy risk. Finally, we show that third-party providers, e.g.,hypergiants, can track up to 17% of subscriber lines in our study.

One Bad Apple Can Spoil Your IPv6 Privacy