What we learned about TEE security from auditing WhatsApp's Private Inference

9 hours ago

WhatsApp's Private Inference feature uses TEEs to process encrypted messages for AI features, with vulnerabilities identified and patched before launch.
Key lessons include: never trust data outside measurement, verify ACPI tables, correctly check firmware patch levels, and ensure attestations have freshness guarantees.
Meta addressed 28 issues, with 16 fully resolved; remaining unresolved issues are low severity with documented justifications.
Audit highlights that TEEs are not a silver bullet, requiring rigorous implementation, comprehensive testing, and early security reviews.

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