A revisit of remote Spectre attacks on Cloudflare Workers
In 2024 and 2025, Cloudflare reassessed remote Spectre attacks on their Workers infrastructure, detailing new attack primitives and defenses to enhance security.
MAIN POINTS
- New attack primitives include Spectre gadgets and remote timers.
- Achieving co-location is critical for the success of these attacks.
- Cloudflare has introduced new defenses to harden Workers infrastructure.
- The reassessment spans the years 2024 and 2025.
TAKEAWAYS
- Understanding Spectre gadgets and remote timers is crucial for addressing new attack vectors.
- Co-location remains a significant factor in the effectiveness of Spectre attacks.
- Continuous reassessment and adaptation are essential for maintaining infrastructure security.
- Cloudflare's proactive approach includes implementing new defenses to mitigate emerging threats.