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Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: Apache Tomcat Session Persistence RCE. Attackers inject malicious serialized objects via the `JSESSIONID` cookie. π₯ **Consequences**: Remote Code Execution (RCE) on the server.β¦
βοΈ **Threshold**: Medium-High. 1οΈβ£ **Config**: Requires Tomcat to use `FileStore` for session persistence (default in many setups). 2οΈβ£ **Access**: Attacker needs to send HTTP requests (Cookie injection).β¦
π£ **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.β¦
π **Self-Check**: 1οΈβ£ **Scan**: Use scanners to detect Tomcat version. 2οΈβ£ **Config**: Check if `Context` XML has `<Manager className="...FileStore" ...>`.β¦
β **Fixed**: YES. Apache released patches in versions 9.0.43+, 8.5.63+, and 7.0.108+. π **Action**: Upgrade to the latest stable version of Apache Tomcat immediately.β¦
π‘οΈ **Workaround (No Patch)**: 1οΈβ£ **Disable FileStore**: Change `Manager` class to `org.apache.catalina.session.StandardManager` (in-memory) or use a database/Redis store.β¦
π₯ **Urgency**: CRITICAL. This is a high-impact RCE vulnerability. π **Priority**: Immediate. If you are running an affected version, patch it NOW.β¦