CVE-2024-21541
📋 TL;DR
This vulnerability allows arbitrary code execution in applications using vulnerable versions of the dom-iterator package. Attackers can inject malicious JavaScript that gets executed via the Function constructor, similar to eval() vulnerabilities. Any application using dom-iterator before version 1.0.1 is affected.
💻 Affected Systems
- dom-iterator JavaScript package
📦 What is this software?
Dom Iterator by Matthewmueller
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code with application privileges, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Remote code execution leading to data exfiltration, credential theft, or installation of backdoors in affected web applications.
If Mitigated
Limited impact if proper input validation and sanitization are implemented, though the vulnerability still exists in the library.
🎯 Exploit Status
Exploitation requires attacker-controlled input to reach the vulnerable Function constructor usage. The vulnerability pattern is well-known and similar to eval() exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.1
Vendor Advisory: https://github.com/matthewmueller/dom-iterator/commit/9e0e0fad5a251de5b42feb326c4204eb04080805
Restart Required: Yes
Instructions:
1. Update package.json to specify dom-iterator version 1.0.1 or higher. 2. Run 'npm update dom-iterator' or 'yarn upgrade dom-iterator'. 3. Restart your application to load the patched version.
🔧 Temporary Workarounds
Input Sanitization
allImplement strict input validation and sanitization for any data that reaches dom-iterator functions
Content Security Policy
allImplement strict CSP headers to limit script execution capabilities
🧯 If You Can't Patch
- Implement network segmentation to isolate affected systems
- Deploy web application firewall rules to detect and block suspicious JavaScript patterns
🔍 How to Verify
Check if Vulnerable:
Check package.json or package-lock.json for dom-iterator version. If version is less than 1.0.1, the system is vulnerable.Check Version:
npm list dom-iterator or check package.json for versionVerify Fix Applied:
Verify dom-iterator version is 1.0.1 or higher in package.json and that the application loads this version.📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript execution patterns
- Suspicious Function constructor usage in application logs
Network Indicators:
- Unexpected outbound connections from web application servers
- Suspicious payloads in HTTP requests containing JavaScript
SIEM Query:
Search for patterns of eval() or Function() constructor usage in application logs, particularly with user-supplied input