CVE-2020-7721
📋 TL;DR
CVE-2020-7721 is a prototype pollution vulnerability in the node-oojs package that allows attackers to inject arbitrary properties into JavaScript objects, potentially leading to remote code execution or denial of service. This affects all applications using any version of node-oojs. Developers using this package in their Node.js applications are at risk.
💻 Affected Systems
- node-oojs
📦 What is this software?
Node Oojs by Node Oojs Project
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service, privilege escalation, or data manipulation through object property injection.
If Mitigated
Limited impact with proper input validation and sandboxing, potentially only causing application crashes.
🎯 Exploit Status
Simple proof-of-concept exploits exist demonstrating prototype pollution via the setPath function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.2
Vendor Advisory: https://snyk.io/vuln/SNYK-JS-NODEOOJS-598678
Restart Required: Yes
Instructions:
1. Update package.json to require node-oojs version 1.0.2 or higher. 2. Run 'npm update node-oojs'. 3. Restart your Node.js application.
🔧 Temporary Workarounds
Input validation wrapper
allWrap setPath calls with validation to prevent prototype pollution
// Add validation before calling setPath
function safeSetPath(obj, path, value) {
if (path.includes('__proto__') || path.includes('constructor') || path.includes('prototype')) {
throw new Error('Invalid path');
}
return setPath(obj, path, value);
}
🧯 If You Can't Patch
- Remove node-oojs dependency entirely if not essential
- Implement strict input validation and sanitization for all user inputs
🔍 How to Verify
Check if Vulnerable:
Check package.json for node-oojs version: grep -A1 -B1 'node-oojs' package.jsonCheck Version:
npm list node-oojsVerify Fix Applied:
Verify installed version: npm list node-oojs | grep node-oojs📡 Detection & Monitoring
Log Indicators:
- Unusual property assignments in objects
- Application crashes with prototype-related errors
- Unexpected object property modifications
Network Indicators:
- HTTP requests with malicious payloads containing __proto__ or constructor strings
SIEM Query:
source="application.logs" AND ("__proto__" OR "constructor.prototype" OR "setPath")