CVE-2024-39008
📋 TL;DR
CVE-2024-39008 is a prototype pollution vulnerability in robinweser's fast-loops library version 1.1.3 that allows attackers to inject arbitrary properties into object prototypes. This can lead to remote code execution or denial of service attacks. Any application using the vulnerable version of fast-loops is affected.
💻 Affected Systems
- fast-loops
⚠️ 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 persistent backdoor installation.
Likely Case
Denial of service through application crashes or instability, potentially leading to data corruption.
If Mitigated
Limited impact if input validation and sanitization prevent malicious payloads from reaching vulnerable functions.
🎯 Exploit Status
Proof of concept available in GitHub gists. Exploitation requires attacker to control input to objectMergeDeep function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.4 or later
Vendor Advisory: https://github.com/robinweser/fast-loops/security/advisories
Restart Required: No
Instructions:
1. Update fast-loops dependency to version 1.1.4 or later. 2. Run npm update fast-loops or yarn upgrade fast-loops. 3. Test application functionality after update.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and sanitization for all data passed to objectMergeDeep function.
Object.freeze on Prototypes
allFreeze Object.prototype and other base prototypes to prevent pollution.
Object.freeze(Object.prototype);
Object.freeze(Array.prototype);
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user-controlled data
- Use security monitoring to detect prototype pollution attempts
🔍 How to Verify
Check if Vulnerable:
Check package.json or package-lock.json for fast-loops version 1.1.3. Run: npm list fast-loops or check installed dependencies.Check Version:
npm list fast-loops | grep fast-loopsVerify Fix Applied:
Verify fast-loops version is 1.1.4 or later. Run: npm list fast-loops and confirm version.📡 Detection & Monitoring
Log Indicators:
- Unusual object property modifications
- Application crashes with prototype-related errors
- Unexpected function executions
Network Indicators:
- Unusual payloads containing __proto__ or constructor properties
- Requests attempting to modify object prototypes
SIEM Query:
search for 'objectMergeDeep' in application logs OR 'prototype pollution' in security alerts