CVE-2024-53386
📋 TL;DR
CVE-2024-53386 is a DOM clobbering vulnerability in Stage.js that allows attackers to inject HTML elements that shadow the document.currentScript property. This can lead to cross-site scripting (XSS) when untrusted HTML input is processed. Applications using Stage.js versions through 0.8.10 that accept user-controlled HTML content are affected.
💻 Affected Systems
- Stage.js
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full XSS exploitation allowing attackers to execute arbitrary JavaScript in victim browsers, potentially leading to session hijacking, data theft, or complete account compromise.
Likely Case
Limited XSS exploitation in specific contexts where user-controlled HTML is rendered, potentially enabling session hijacking or data exfiltration.
If Mitigated
No impact if proper input sanitization and Content Security Policy are implemented, or if user HTML input is not accepted.
🎯 Exploit Status
Exploitation requires the application to process attacker-controlled HTML input. Public proof-of-concept demonstrates the technique.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.8.11 or later
Vendor Advisory: https://github.com/piqnt/stage.js
Restart Required: No
Instructions:
1. Update Stage.js to version 0.8.11 or later. 2. Replace vulnerable code in lib/core.js lines 158-159 with patched version. 3. Test application functionality.
🔧 Temporary Workarounds
Input Sanitization
allImplement strict HTML sanitization for all user-controlled input using libraries like DOMPurify.
Content Security Policy
allImplement strict Content Security Policy headers to mitigate XSS impact.
🧯 If You Can't Patch
- Disable processing of HTML input from untrusted sources.
- Implement additional validation layers to reject HTML elements in user input.
🔍 How to Verify
Check if Vulnerable:
Check if Stage.js version is 0.8.10 or earlier and if the application processes user HTML input.Check Version:
Check package.json or inspect the Stage.js library file for version information.Verify Fix Applied:
Verify Stage.js version is 0.8.11 or later and test with known exploit payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual HTML element patterns in user input
- Multiple failed input validation attempts
Network Indicators:
- HTTP requests containing suspicious HTML element patterns
SIEM Query:
Search for user input containing HTML elements like <script> or <img> with unusual attributes targeting document.currentScript