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Meta and Yandex are de-anonymizing Android users’ web browsing identifiers - Ars Technica (arstechnica.com)

submitted 4 days ago by [email protected] to c/[email protected]

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Tracking code that Meta and Russia-based Yandex embed into millions of websites is de-anonymizing visitors by abusing legitimate Internet protocols, causing Chrome and other browsers to surreptitiously send unique identifiers to native apps installed on a device, researchers have discovered. Google says it's investigating the abuse, which allows Meta and Yandex to convert ephemeral web identifiers into persistent mobile app user identities.

The covert tracking—implemented in the Meta Pixel and Yandex Metrica trackers—allows Meta and Yandex to bypass core security and privacy protections provided by both the Android operating system and browsers that run on it. Android sandboxing, for instance, isolates processes to prevent them from interacting with the OS and any other app installed on the device, cutting off access to sensitive data or privileged system resources. Defenses such as state partitioning and storage partitioning, which are built into all major browsers, store site cookies and other data associated with a website in containers that are unique to every top-level website domain to ensure they're off-limits for every other site.

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[–] [email protected] 2 points 3 days ago

All of this is far easier to subvert than tracking scripts (and cookies and port scans) which literally as evidenced by the article in the OP are not techniques that companies have "gone away" from at all, at least not by entirely replacing them.