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Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: Apache Tomcat allows uploading JSP files via HTTP PUT method. <br>π₯ **Consequences**: Remote Code Execution (RCE). Attackers upload malicious `.jsp` files and execute arbitrary code on the server.β¦
π‘οΈ **Root Cause**: Insufficient input validation/checks on the HTTP PUT method. <br>π **Flaw**: The server design intended to block JSP uploads via PUT, but the check was bypassed.β¦
π¦ **Affected**: Apache Tomcat 7.0.0 through 7.0.79. <br>π’ **Vendor**: Apache Software Foundation (Jakarta Project). <br>π **Scope**: Lightweight Web Application Server, often used for JSP development/debugging.
Q4What can hackers do? (Privileges/Data)
π **Privileges**: Full Remote Code Execution (RCE). <br>πΎ **Data**: Can execute any command the Tomcat process user has permissions for.β¦
βοΈ **Config Requirement**: HIGH. <br>π **Auth**: No authentication required for the exploit itself. <br>π¦ **Condition**: The HTTP PUT method MUST be enabled on the Tomcat server.β¦
π **Self-Check**: <br>1. Check Tomcat version (7.0.0 - 7.0.79). <br>2. Verify if HTTP PUT method is enabled/allowed. <br>3. Attempt to upload a harmless `.jsp` file via PUT. <br>4.β¦
π‘οΈ **Workaround (No Patch)**: <br>1. **Disable HTTP PUT**: Configure Tomcat to reject PUT requests. <br>2. **Firewall Rules**: Block external access to the PUT method. <br>3.β¦
π₯ **Urgency**: CRITICAL. <br>β‘ **Priority**: Immediate action required. <br>π **Risk**: RCE is a top-tier threat. <br>π **Action**: Upgrade Tomcat immediately or disable PUT method if upgrade is not possible.β¦