CVE-2021-35250 — AI Deep Analysis Summary

🚨 **Essence**: Path Traversal (CWE-22) in SolarWinds Serv-U FTP Server. 📉 **Consequences**: Attackers bypass directory restrictions to access files outside the intended scope.…

🛡️ **Root Cause**: CWE-22 (Improper Limitation of a Pathname). The system fails to filter special elements in resource/file paths. 🚫 Input validation is missing or flawed. 🐛

🏢 **Vendor**: SolarWinds. 📦 **Product**: Serv-U FTP Server. 📅 **Affected Version**: Specifically noted as **v.15.3.0.X** in PoC. ⚠️ Check your specific build version!

🕵️ **Attacker Actions**: Access restricted directories. 📂 Read installation/server files. 🔓 Obtain sensitive info. 📝 Modify data. 🛠️ Execute unauthorized admin ops. 🚀

🔓 **Threshold**: LOW. 🌐 **Network**: AV:N (Network exploitable). 🛑 **Auth**: PR:N (No Privileges required). 🖱️ **UI**: UI:N (No User Interaction). 📉 **AC**: L (Low Complexity). Easy to exploit!

🔥 **Public Exp**: YES. 📂 **PoC Available**: GitHub repos exist (e.g., rissor41, ProjectDiscovery Nuclei templates). 🌍 **Wild Exploitation**: High risk due to public availability. 🚨

🔍 **Self-Check**: Scan for Serv-U v15.3.0.X. 🧪 **Tools**: Use Nuclei templates for CVE-2021-35250. 📡 **Feature**: Look for directory traversal attempts in logs. 🛠️

✅ **Fixed**: YES. 📥 **Patch**: SolarWinds released HotFix 1 for Serv-U 15.3. 🔗 **Ref**: Official support article & Trust Center advisory. 📝

🚧 **No Patch?**: Isolate the server. 🚫 Block external access if possible. 🛡️ Implement WAF rules to block path traversal patterns (../). 👀 Monitor logs intensely. 📝

🔴 **Urgency**: HIGH. 🚨 **Priority**: CRITICAL. 📉 CVSS Score indicates High Confidentiality impact. 🛑 No auth needed. 🏃‍♂️ Patch immediately! ⏳