CVE-2021-45428 — AI Deep Analysis Summary

🚨 **Essence**: Telesquare TLR-2005KSH router has a critical flaw. 📉 **Consequences**: Attackers can upload arbitrary files (HTML/CGI). This leads to potential **defacement** or **remote code execution**.…

🛡️ **Root Cause**: **Incorrect Access Control**. 🔓 **Flaw**: The **PUT HTTP method** is enabled unnecessarily. This allows unauthorized file uploads directly to the system. No proper validation is in place.

📦 **Affected Product**: Telesquare TLR-2005KSH. 🇰🇷 **Vendor**: Telesquare (South Korea). 📡 **Type**: SK Telecom LTE Router. ⚠️ **Scope**: Specific model only. No other versions mentioned.

💻 **Hackers Can**: Upload **arbitrary files**. 📄 **Formats**: HTML and CGI scripts. 🎯 **Impact**: Full control over web interface. Potential for **defacement** or **backdoor installation**.…

🔑 **Auth Status**: Not explicitly stated as requiring auth. 🌐 **Config**: Relies on **PUT method** being enabled. 📉 **Threshold**: Likely **LOW** if the method is exposed. Attackers just need to send a PUT request.…

🔥 **Public Exp?**: YES. 📂 **PoC**: Available on GitHub (`CVE-2021-45428-Defacer`). 🚀 **Automation**: Nuclei templates exist. 📜 **Proof**: PacketStorm Security report linked. Wild exploitation is possible.

🔍 **Self-Check**: Scan for **HTTP PUT method** support. 🛠️ **Tool**: Use Nuclei or custom scripts. 📡 **Target**: Check if `/` or upload endpoints accept PUT. 📝 **Verify**: Try uploading a test HTML file.…

🩹 **Official Patch**: Data does **not** mention a specific vendor patch. 📅 **Published**: Jan 3, 2022. ⏳ **Status**: Likely **unpatched** or no official fix provided in this data. Rely on mitigations.

🚧 **Workaround**: **Disable PUT method** via firewall rules. 🛑 **Block**: Restrict HTTP methods at the network perimeter. 🚫 **Access Control**: Implement strict WAF rules.…

🔴 **Urgency**: **HIGH**. 🚨 **Reason**: Easy exploitation (PUT method). 📉 **Impact**: Defacement/RCE. 📢 **Action**: Immediate mitigation required. Do not ignore. Protect your LTE router now.