CVE-2020-9484 — AI Deep Analysis Summary

🚨 **Essence**: Apache Tomcat Session Persistence RCE. Attackers inject malicious serialized objects via the `JSESSIONID` cookie. 💥 **Consequences**: Remote Code Execution (RCE) on the server.…

🛡️ **Root Cause**: Insecure Deserialization. Tomcat's default session persistence mechanism (using `FileStore`) reads session data from disk.…

📦 **Affected Products**: Apache Tomcat. 📅 **Affected Versions**: • 10.0.0-M1 to 10.0.0-M4 • 9.0.0.M1 to 9.0.42 (Before 9.0.43) • 8.5.0 to 8.5.62 (Before 8.5.63) • 7.0.0 to 7.0.107 (Before 7.0.108) ⚠️ *Note: Newer versio…

👑 **Privileges**: Full System Access. The code executes with the privileges of the Tomcat process.…

⚖️ **Threshold**: Medium-High. 1️⃣ **Config**: Requires Tomcat to use `FileStore` for session persistence (default in many setups). 2️⃣ **Access**: Attacker needs to send HTTP requests (Cookie injection).…

💣 **Public Exp**: YES. Multiple PoCs exist on GitHub (e.g., `masahiro331/CVE-2020-9484`, `IdealDreamLast/CVE-2020-9484`). Tools like `ysoserial` are used to generate the payload.…

🔍 **Self-Check**: 1️⃣ **Scan**: Use scanners to detect Tomcat version. 2️⃣ **Config**: Check if `Context` XML has `<Manager className="...FileStore" ...>`.…

✅ **Fixed**: YES. Apache released patches in versions 9.0.43+, 8.5.63+, and 7.0.108+. 🔄 **Action**: Upgrade to the latest stable version of Apache Tomcat immediately.…

🛡️ **Workaround (No Patch)**: 1️⃣ **Disable FileStore**: Change `Manager` class to `org.apache.catalina.session.StandardManager` (in-memory) or use a database/Redis store.…

🔥 **Urgency**: CRITICAL. This is a high-impact RCE vulnerability. 🚀 **Priority**: Immediate. If you are running an affected version, patch it NOW.…