CVE-2022-29078 — AI Deep Analysis Summary

🚨 **Essence**: Server-Side Template Injection (SSTI) in EJS. 📉 **Consequences**: Arbitrary OS command execution. Attackers inject malicious code via `outputFunctionName` settings, leading to full system compromise.

🛡️ **Root Cause**: CWE-94 (Code Injection). The flaw lies in how `settings[view options][outputFunctionName]` is parsed. It allows overriding internal options with arbitrary OS commands during template compilation.

📦 **Affected**: EJS (Embedded JavaScript templates). Specifically **version 3.1.6** and likely earlier versions. Used in Node.js applications for rendering HTML.

💀 **Attacker Power**: Full Remote Code Execution (RCE). Hackers can execute **any OS command** with the privileges of the application process (e.g., `touch /tmp/pwned`, `id`).

⚡ **Threshold**: **LOW**. No authentication required. Exploitation is via HTTP GET parameters (`?settings[view options][outputFunctionName]=...`). Easy to trigger via browser or simple scripts.

🔓 **Public Exp**: **YES**. Multiple PoCs exist on GitHub (e.g., `miko550`, `chuckdu21`). Automated Python scripts and Docker setups are available for immediate testing.

🔍 **Self-Check**: Scan for EJS 3.1.6 usage. Test URLs with the payload: `settings[view options][outputFunctionName]=x;process.mainModule.require('child_process').execSync('id');s`. Look for command output in response.

🩹 **Fix**: Upgrade EJS to the latest patched version. Check `npm` for updates. The vulnerability was disclosed in April 2022; ensure you are not running 3.1.6.

🚧 **No Patch?**: Input validation is hard here. Best workaround: **Sanitize inputs** strictly. However, since it affects internal compilation settings, **patching is the only reliable fix**. Isolate the service.

🔥 **Urgency**: **CRITICAL**. RCE via simple URL parameter. High impact, low effort. Immediate patching or mitigation required for any production systems using vulnerable EJS versions.