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User data is the primary input of digital advertising, fueling the freeInternet as we know it. As a result, web companies invest a lot in elaboratetracking mechanisms to acquire user data that can sell to data markets andadvertisers. However, with same-origin policy, and cookies as a primaryidentification mechanism on the web, each tracker knows the same user with adifferent ID. To mitigate this, Cookie Synchronization (CSync) came to therescue, facilitating an information sharing channel between third parties thatmay or not have direct access to the website the user visits. In thebackground, with CSync, they merge user data they own, but also reconstruct auser's browsing history, bypassing the same origin policy. In this paper, weperform a first to our knowledge in-depth study of CSync in the wild, using ayear-long weblog from 850 real mobile users. Through our study, we aim tounderstand the characteristics of the CSync protocol and the impact it has onweb users' privacy. For this, we design and implement CONRAD, a holisticmechanism to detect CSync events at real time, and the privacy loss on the userside, even when the synced IDs are obfuscated. Using CONRAD, we find that 97%of the regular web users are exposed to CSync: most of them within the firstweek of their browsing, and the median userID gets leaked, on average, to 3.5different domains. Finally, we see that CSync increases the number of domainsthat track the user by a factor of 6.75.

Cookie Synchronization: Everything You Always Wanted to Know But Were Afraid to Ask