CVE-2020-7713
📋 TL;DR
CVE-2020-7713 is a prototype pollution vulnerability in the arr-flatten-unflatten npm package that allows attackers to modify object prototypes, potentially leading to remote code execution or denial of service. This affects all versions of the package, impacting any Node.js application using it directly or as a dependency. Developers using this package in their projects are at risk.
💻 Affected Systems
- arr-flatten-unflatten npm package
📦 What is this software?
Arr Flatten Unflatten by Arr Flatten Unflatten 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, application crashes, or unauthorized data manipulation.
If Mitigated
Limited impact with proper input validation and sandboxing, but still poses security risks.
🎯 Exploit Status
Exploitation requires attacker-controlled input to the vulnerable functions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://snyk.io/vuln/SNYK-JS-ARRFLATTENUNFLATTEN-598396
Restart Required: Yes
Instructions:
1. Remove arr-flatten-unflatten from package.json. 2. Run npm uninstall arr-flatten-unflatten. 3. Find alternative packages like lodash.flatten. 4. Update dependencies and restart application.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation for all data passed to arr-flatten-unflatten functions.
Use Object.freeze on prototypes
allFreeze Object.prototype to prevent prototype pollution.
Object.freeze(Object.prototype);
🧯 If You Can't Patch
- Isolate the vulnerable component in a sandboxed environment
- Implement network segmentation to limit blast radius
🔍 How to Verify
Check if Vulnerable:
Check package.json or package-lock.json for arr-flatten-unflatten dependency.Check Version:
npm list arr-flatten-unflattenVerify Fix Applied:
Verify arr-flatten-unflatten is no longer in package.json and node_modules.📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Unusual prototype modifications in logs
Network Indicators:
- Suspicious HTTP requests with crafted payloads
SIEM Query:
Search for process crashes or errors related to arr-flatten-unflatten in application logs.