CVE-2020-28269
📋 TL;DR
This is a prototype pollution vulnerability in the 'field' npm package versions 0.0.1 through 1.0.1. Attackers can manipulate object prototypes to cause denial of service or potentially achieve remote code execution. Any application using vulnerable versions of this package is affected.
💻 Affected Systems
- field npm package
📦 What is this software?
Field by Exodus
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service causing application crashes and service disruption.
If Mitigated
Limited impact with proper input validation and security controls in place.
🎯 Exploit Status
Prototype pollution vulnerabilities are well-understood and often easily exploitable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.2
Vendor Advisory: https://github.com/jprichardson/field/security/advisories
Restart Required: Yes
Instructions:
1. Update package.json to require 'field' version 1.0.2 or higher. 2. Run 'npm update field' or 'npm install field@latest'. 3. Restart your application.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation to reject malformed objects that could trigger prototype pollution.
🧯 If You Can't Patch
- Implement network segmentation to isolate affected systems
- Deploy web application firewall with prototype pollution detection rules
🔍 How to Verify
Check if Vulnerable:
Check package.json or run 'npm list field' to see installed version.Check Version:
npm list field | grep fieldVerify Fix Applied:
Verify installed version is 1.0.2 or higher using 'npm list field'.📡 Detection & Monitoring
Log Indicators:
- Unusual application crashes
- Unexpected object property modifications
- Memory exhaustion errors
Network Indicators:
- Unusual HTTP requests with nested objects
- Requests containing __proto__ or constructor properties
SIEM Query:
source="application_logs" AND ("prototype pollution" OR "__proto__" OR "constructor")🔗 References
- https://github.com/jprichardson/field/blob/2a3811dfc4cdd13833977477d2533534fc61ce06/lib/field.js#L39
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2020-28269
- https://github.com/jprichardson/field/blob/2a3811dfc4cdd13833977477d2533534fc61ce06/lib/field.js#L39
- https://www.whitesourcesoftware.com/vulnerability-database/CVE-2020-28269
