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

submitted 3 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] 3 points 1 day ago* (last edited 1 day ago)

Does anyone know if there's additional sandboxing of local ports happening for apps running in Private Space?

E: Checked myself. Can access servers in Private Space from non-Private Space browsers and vice versa. So Facebook installed in Private Space is no bueno. Even if the time to transfer data is limited since Private Space is running for short periods of time, it's likely enough to pass a token while browsing some sites.