Cloudflare Workers Spectre Attack Leaks JWT From Co-Located Worker at 12 Bits/Second
A new Spectre attack method has been demonstrated, targeting Cloudflare Workers and extracting sensitive data.
Evidence dossier
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- Detected The first matching coverage entered the Archynetys cluster.
- Latest coverage observed Most recent article currently attached to this story cluster.
- Peak measured velocity The recorded velocity reached 3.
- Evidence threshold reached The story had enough independent coverage for an explanatory brief.
Source diversity sample: SC Media · GIGAZINE · Tech Times · Cloudflare Blog · The Hacker News.
How this dossier is built: methodology · AI policy · corrections.
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The story so far
Researchers have demonstrated a faster remote Spectre attack against Cloudflare Workers. The attack extracts sensitive information, specifically JSON Web Tokens, from co-located workers at a rate of 12 bits per second. This marks a significant increase in speed compared to previous attacks.
The attack was first reported by SC Media, with subsequent coverage from GIGAZINE, Tech Times, and The Hacker News. Cloudflare's own blog acknowledged the attack, providing technical details and confirming the vulnerability. The Hacker News and Tech Times noted that the attack is 360 times faster than prior methods.
The Cloudflare Blog and SC Media both confirm the attack's success. However, the Cloudflare Blog does not specify the speed of the attack, while The Hacker News and Tech Times do. The attack's speed is the most notable change, as it represents a substantial improvement over previous methods.
Synthesized by Archynetys from the headlines below under a strict no-invention contract. ✓ fact-checked: all claims supported by sources Updated 1h ago.
The reporting (5)
- Researchers demonstrate faster remote Spectre attack against Cloudflare Workers SC Media · 1d ago
- Cloudflare successfully launched a remote Spectre attack, extracting sensitive information from workers at up to 12 bits per second. GIGAZINE · 1d ago
- Cloudflare Workers Spectre Exploit Stole Auth Tokens 360× Faster Than Prior Attack Tech Times · 1d ago
- A revisit of remote Spectre attacks on Cloudflare Workers Cloudflare Blog · 1d ago
- Cloudflare Workers Spectre Attack Leaks JWT From Co-Located Worker at 12 Bits/Second The Hacker News · 1d ago
The obvious questions
What is a Spectre attack?
A Spectre attack exploits vulnerabilities in modern processors to leak sensitive information from other processes running on the same hardware.
What are Cloudflare Workers?
Cloudflare Workers are a serverless platform that allows developers to run JavaScript, Rust, and C code on Cloudflare's edge network.
What is a JSON Web Token?
A JSON Web Token is a compact, URL-safe means of representing claims to be transferred between two parties.
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