CVE-2023-4136
📋 TL;DR
This CVE describes a reflected cross-site scripting (XSS) vulnerability in CrafterCMS Engine that allows attackers to inject malicious scripts into web pages. The vulnerability affects CrafterCMS versions 4.0.0 through 4.0.2 and 3.1.0 through 3.1.27 across multiple platforms. Attackers can exploit this by tricking users into clicking specially crafted links.
💻 Affected Systems
- CrafterCMS Engine
📦 What is this software?
Craftercms by Craftercms
Craftercms by Craftercms
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems.
Likely Case
Session hijacking, credential theft, and unauthorized actions performed in the context of authenticated users.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
Public exploit details available in security advisories; reflected XSS typically requires user interaction via malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.3 or 3.1.28
Vendor Advisory: https://docs.craftercms.org/en/4.0/security/advisory.html#cv-2023080301
Restart Required: Yes
Instructions:
1. Backup your CrafterCMS instance. 2. Upgrade to CrafterCMS 4.0.3 or 3.1.28. 3. Restart the CrafterCMS service. 4. Verify the fix by testing XSS payloads.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to web server configuration
Input Validation Filter
allImplement server-side input validation for all user inputs
Configure web application firewall rules to block XSS patterns
🧯 If You Can't Patch
- Implement strict Content Security Policy headers
- Deploy web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check CrafterCMS version against affected ranges: 4.0.0-4.0.2 or 3.1.0-3.1.27Check Version:
Check CrafterCMS admin panel or configuration files for version informationVerify Fix Applied:
Verify version is 4.0.3+ or 3.1.28+ and test with XSS payloads like <script>alert('test')</script>📡 Detection & Monitoring
Log Indicators:
- Unusual URL parameters containing script tags or JavaScript code
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests with suspicious parameters containing script tags or JavaScript
SIEM Query:
web.url:*<script* OR web.url:*javascript:*🔗 References
- http://packetstormsecurity.com/files/174304/CrafterCMS-4.0.2-Cross-Site-Scripting.html
- http://seclists.org/fulldisclosure/2023/Aug/30
- https://docs.craftercms.org/en/4.0/security/advisory.html#cv-2023080301
- http://packetstormsecurity.com/files/174304/CrafterCMS-4.0.2-Cross-Site-Scripting.html
- http://seclists.org/fulldisclosure/2023/Aug/30
- https://docs.craftercms.org/en/4.0/security/advisory.html#cv-2023080301
