CVE-2024-39943 — AI Deep Analysis Summary

🚨 **Essence**: Rejetto HFS (HTTP File Server) allows **Remote Code Execution (RCE)**. 📉 **Consequences**: Attackers can execute arbitrary OS commands, leading to full system compromise, data theft, or server takeover.…

🛠️ **Root Cause**: Improper use of `child_process.execSync()` in Node.js. 🐛 **Flaw**: The application uses a shell to execute the `df` command (disk free) instead of the safer `spawnSync()`.…

🎯 **Affected**: Rejetto HFS version **< 0.52.10**. 💻 **Platforms**: Linux, UNIX, and macOS. 📦 **Component**: The Node.js-based file server module handling file uploads and disk space checks.

🕵️ **Hackers Can**: Execute **any OS command** with the privileges of the HFS process. 📂 **Data Impact**: Read/Write/Delete files, install backdoors, pivot to internal networks.…

🔑 **Threshold**: Medium. 📝 **Requirements**: 1. Target version < 0.52.10. 2. Valid **Authenticated Cookie**. 3. User must have **Upload Permissions**. 🚫 Not fully anonymous; requires login.

🌍 **Public Exp?**: YES. 📂 **PoCs Available**: Multiple GitHub repos (e.g., `truonghuuphuc/CVE-2024-39943-Poc`, `A-little-dragon/CVE-2024-39943-Exploit`). 🚀 **Status**: Easy to exploit if prerequisites are met.…

🔍 **Self-Check**: 1. Check HFS version (must be < 0.52.10). 2. Verify if upload feature is enabled. 3. Scan for open HFS ports. 🛠️ **Tools**: Use Nmap to detect HFS banners. Check admin panel for version info.

✅ **Fixed?**: YES. 📦 **Patch**: Update to **version 0.52.10** or later. 🔗 **Reference**: Commit `305381bd36eee074fb238b64302a252668daad1d` fixes the `execSync` issue. 🔄 Official wiki confirms the fix.

🛡️ **No Patch?**: 1. **Disable Uploads**: If not needed, remove upload permissions for all users. 2. **Network Isolation**: Block external access to HFS ports. 3.…

🔥 **Urgency**: HIGH. 📅 **Published**: July 4, 2024. ⚡ **Risk**: RCE with available PoCs. 🚨 **Action**: Patch immediately or disable upload features. Do not ignore this vulnerability!