CVE-2011-1473 — AI Deep Analysis Summary

🚨 **Essence**: A flaw in OpenSSL's permission/access control. 📉 **Consequences**: Enables TLS Renegotiation DoS attacks. Servers can be flooded, leading to service disruption. 💥 **Impact**: Denial of Service (DoS).

🛡️ **Root Cause**: Lack of effective permission and access control measures. 🐛 **Flaw**: The system fails to restrict unauthorized or excessive TLS renegotiation requests. 📌 **CWE**: Not specified in data (null).

📦 **Affected**: OpenSSL 0.9.8l (earlier versions) AND 0.9.8m to 1.x versions. 🏢 **Vendor**: OpenSSL Team. 🌐 **Component**: SSLv2/v3 and TLSv1 protocol libraries.

🕵️ **Hackers Can**: Flood servers with TLS renegotiation requests. 🚫 **Privileges**: No direct privilege escalation mentioned. 📂 **Data**: No data theft mentioned. ⚠️ **Primary Goal**: Disrupt service availability (DoS).

🔓 **Threshold**: Low. 🌐 **Auth**: No authentication required. 📝 **Config**: Exploits protocol-level behavior. 🚀 **Ease**: Simple script-based flooding (bash script available).

✅ **Yes**: Public PoC exists. 🔗 **Links**: GitHub repos (`cve-2011-1473`, `bash-tls-reneg-attack`). 📜 **Details**: Bash script to flood servers via openssl client.…

🔍 **Check**: Scan for OpenSSL versions < 0.9.8l or between 0.9.8m-1.x. 📡 **Features**: Look for TLS renegotiation handling. 🛠️ **Tools**: Use vulnerability scanners targeting OpenSSL DoS.…

🛠️ **Fixed**: Yes, implied by version ranges. 📦 **Patch**: Update OpenSSL to versions outside the affected range (post 1.x or specific fixed 0.9.8m+). 📝 **Mitigation**: Disable TLS renegotiation if possible.…

🚧 **Workaround**: Disable TLS renegotiation on the server. 🚫 **Config**: Restrict renegotiation frequency. 🛡️ **WAF**: Block excessive renegotiation requests. 📉 **Limit**: Rate-limit TLS connections.…

🔥 **Urgency**: High. 📅 **Published**: 2012-06-16 (Historical but critical). ⚠️ **Risk**: DoS affects availability. 🚀 **Priority**: Patch immediately if still running vulnerable versions.…