CVE-2014-9727 — AI Deep Analysis Summary

🚨 **Essence**: AVM Fritz!Box suffers from **OS Command Injection**. The `cgi-bin/webcm` URI fails to sanitize the `var:lang` parameter.…

🛡️ **Root Cause**: **Improper Input Validation**. Specifically, the system does not adequately filter **shell meta-characters** within the `var:lang` parameter.…

📦 **Affected**: **AVM Fritz!Box** routers (German manufacturer AVM). <br>📅 **Published**: May 29, 2015.…

💀 **Attacker Capabilities**: <br>1. Execute **arbitrary system commands**. <br>2. Gain **remote control** over the router. <br>3. Potential access to network data and configuration.…

🔓 **Exploitation Threshold**: **LOW**. <br>🌐 **Auth**: Described as **Remote** exploitation. <br>⚙️ **Config**: No authentication mentioned as a barrier. The flaw is in a web CGI interface, likely accessible via HTTP.

💣 **Public Exploit**: **YES**. <br>📎 **References**: <br>- Exploit-DB ID: **33136** <br>- OSVDB ID: **103289** <br>- Trustwave SpiderLabs Blog analysis available.…

🔍 **Self-Check**: <br>1. Scan for **AVM Fritz!Box** devices. <br>2. Check for the presence of `cgi-bin/webcm`. <br>3. Test the `var:lang` parameter for **shell injection** payloads (e.g., `; ls`). <br>4.…

🩹 **Official Fix**: The data does not explicitly list a patch version. <br>✅ **Mitigation**: Update firmware to the latest version provided by AVM.…

🛑 **No Patch Workaround**: <br>1. **Block Access**: Restrict access to `cgi-bin/webcm` via firewall rules. <br>2. **Disable CGI**: If possible, disable unnecessary CGI services. <br>3.…

🚨 **Urgency**: **HIGH**. <br>🔥 **Reason**: <br>- **Remote** execution. <br>- **No auth** required. <br>- **Public PoC** exists. <br>🎯 **Priority**: Immediate patching or mitigation is recommended for all exposed Fritz!…