This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis β
Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: Envoy suffers from **CPU Exhaustion** due to HTTP/2 frame flooding. π **Consequences**: Service degradation, high CPU usage, potential **Denial of Service (DoS)**.β¦
π‘οΈ **Root Cause**: **CWE-390** (Detection of Error Condition Without Action). The HTTP/2 codec fails to limit the number of **CONTINUATION frames**.β¦
π¦ **Affected Products**: Envoy Proxy. π **Vulnerable Versions**: <br>β’ 1.29.3 (Before) <br>β’ 1.28.2 (Before) <br>β’ 1.27.4 (Before) <br>β’ 1.26.8 (Before). β **Safe**: Versions equal to or newer than these are patched.
Q4What can hackers do? (Privileges/Data)
π΅οΈ **Attacker Actions**: Hackers can flood the server with **CONTINUATION frames**. π« **Privileges**: No authentication needed. π **Impact**: **Availability** impact (Low CVSS A:L).β¦
π» **Public Exploit**: **YES**. A Python PoC is available on GitHub (blackmagic2023). π **Description**: Demonstrates CPU exhaustion via CONTINUATION frame flood.β¦
π **Self-Check**: Scan for Envoy versions < 1.26.8/1.27.4/1.28.2/1.29.3. π‘ **Monitoring**: Watch for abnormal CPU spikes correlated with HTTP/2 traffic.β¦
π§ **No Patch Workaround**: Implement rate limiting on HTTP/2 CONTINUATION frames at the network edge (WAF/Load Balancer). π **Mitigation**: Block or throttle excessive HTTP/2 control frames from untrusted sources.β¦