CVE-2008-5626 — AI Deep Analysis Summary

🚨 **Essence**: A Denial of Service (DoS) flaw in XM Easy Personal FTP Server. 💥 **Consequences**: The server crashes or becomes unresponsive when receiving a crafted `NLST` command variable (e.g., `-1`).…

🛡️ **Root Cause**: Input validation failure in the `NLST` command handler. 🐛 **Flaw**: The software fails to properly sanitize or handle specific variable inputs passed to the NLST instruction, leading to a crash.

📦 **Affected Product**: XM Easy Personal FTP Server. 📅 **Version**: Specifically version **5.6.0**. ⚠️ **Scope**: Any instance running this specific version is at risk.

🎯 **Attacker Action**: Remote attackers can trigger a DoS. 🔒 **Privileges**: Requires **remote authentication**. 📉 **Impact**: Service interruption, not data theft or code execution.

🔑 **Threshold**: Medium. 📝 **Auth**: Requires valid credentials to log in first. 🌐 **Config**: Must be accessible remotely. It is not an unauthenticated exploit.

💣 **Public Exploit**: Yes. 📂 **Sources**: Exploit-DB ID **6741** is available. 📜 **References**: VUPEN ADV-2008-2803 and SecurityFocus BID 31739 confirm the vulnerability details.

🔍 **Self-Check**: Scan for XM Easy Personal FTP Server. 🏷️ **Indicator**: Look for version **5.6.0**. 🧪 **Test**: Attempt to send a malformed `NLST` command with a special variable (like `-1`) after authentication.

🩹 **Official Fix**: The data does not list a specific patch version. 📅 **Date**: Published Dec 17, 2008. 🔄 **Action**: Users should check the vendor's site for updates or upgrade to a newer, secure version if available.

🚧 **Workaround**: Restrict FTP access to trusted IPs only. 🚫 **Mitigation**: Disable the `NLST` command if the server supports custom command filtering. 🛑 **Best**: Isolate the server from the public internet.

⚡ **Urgency**: Moderate. 📉 **Risk**: DoS only, no RCE. 📅 **Age**: Old (2008). ✅ **Priority**: Low for modern systems, but **High** if you are still running legacy version 5.6.0.