Cloudflare Workers Spectre Attack Leaks JWT

Cybersecurity researchers from TU Graz have disclosed a highly sophisticated Remote-Timer-as-a-Service side-channel execution flaw against serverless edge environments. In a controlled production test, this cloudflare workers spectre attack (a modern evolution of the foundational CVE-2017-5753 Spectre flaw) successfully leaked a JSON Web Token (JWT) from a co-located Worker at an astonishing rate of 12 bits per second (at 99.16% accuracy)—nearly 360 times faster than similar attacks demonstrated in 2021.

Source: cyberupdates365.com