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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: Rejetto HFS (HTTP File Server) allows **Remote Code Execution (RCE)**. ๐ **Consequences**: Attackers can execute arbitrary OS commands, leading to full system compromise, data theft, or server takeover.โฆ
๐ ๏ธ **Root Cause**: Improper use of `child_process.execSync()` in Node.js. ๐ **Flaw**: The application uses a shell to execute the `df` command (disk free) instead of the safer `spawnSync()`.โฆ
๐ฏ **Affected**: Rejetto HFS version **< 0.52.10**. ๐ป **Platforms**: Linux, UNIX, and macOS. ๐ฆ **Component**: The Node.js-based file server module handling file uploads and disk space checks.
Q4What can hackers do? (Privileges/Data)
๐ต๏ธ **Hackers Can**: Execute **any OS command** with the privileges of the HFS process. ๐ **Data Impact**: Read/Write/Delete files, install backdoors, pivot to internal networks.โฆ
๐ **Self-Check**: 1. Check HFS version (must be < 0.52.10). 2. Verify if upload feature is enabled. 3. Scan for open HFS ports. ๐ ๏ธ **Tools**: Use Nmap to detect HFS banners. Check admin panel for version info.
Q8Is it fixed officially? (Patch/Mitigation)
โ **Fixed?**: YES. ๐ฆ **Patch**: Update to **version 0.52.10** or later. ๐ **Reference**: Commit `305381bd36eee074fb238b64302a252668daad1d` fixes the `execSync` issue. ๐ Official wiki confirms the fix.
Q9What if no patch? (Workaround)
๐ก๏ธ **No Patch?**: 1. **Disable Uploads**: If not needed, remove upload permissions for all users. 2. **Network Isolation**: Block external access to HFS ports. 3.โฆ
๐ฅ **Urgency**: HIGH. ๐ **Published**: July 4, 2024. โก **Risk**: RCE with available PoCs. ๐จ **Action**: Patch immediately or disable upload features. Do not ignore this vulnerability!