CVE-2023-43345
📋 TL;DR
A stored cross-site scripting (XSS) vulnerability in opensolution Quick CMS v6.7 allows attackers to inject malicious scripts into the 'Content - Name' parameter in the Pages Menu component. When users view affected pages, the scripts execute in their browsers, potentially stealing session cookies or performing actions on their behalf. This affects all Quick CMS v6.7 installations with the vulnerable component enabled.
💻 Affected Systems
- opensolution Quick CMS
📦 What is this software?
Quick Cms by Opensolution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain administrative access, deface websites, install backdoors, or redirect users to malicious sites, potentially leading to complete system compromise.
Likely Case
Attackers inject malicious JavaScript that steals user session cookies or credentials when users visit compromised pages, leading to account takeover and unauthorized access.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before reaching users, preventing execution while maintaining functionality.
🎯 Exploit Status
Exploitation requires local access or authenticated user privileges to inject scripts into the 'Content - Name' parameter. The public proof-of-concept demonstrates straightforward injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch is available. Consider upgrading to a newer version if available, or implement workarounds such as input validation and output encoding.
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side validation to sanitize or reject malicious input in the 'Content - Name' parameter.
Edit the relevant PHP files to add input sanitization functions like htmlspecialchars() or filter_var()
Enable Content Security Policy (CSP)
allImplement CSP headers to restrict script execution sources and mitigate XSS impact.
Add 'Content-Security-Policy' header to web server configuration or PHP files
🧯 If You Can't Patch
- Disable or restrict access to the Pages Menu component if not essential
- Implement web application firewall (WAF) rules to block XSS payloads in the affected parameter
🔍 How to Verify
Check if Vulnerable:
Test by injecting a simple XSS payload like <script>alert('XSS')</script> into the 'Content - Name' parameter and check if it executes when viewing the page.Check Version:
Check the CMS version in the admin panel or by examining the software files for version indicators.Verify Fix Applied:
After applying fixes, repeat the XSS test to ensure scripts are properly sanitized and do not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual entries in access logs showing script tags or encoded payloads in POST requests to pages management endpoints
- Multiple failed login attempts followed by successful access to admin pages
Network Indicators:
- HTTP requests containing script tags or JavaScript code in the 'Content - Name' parameter
- Unexpected outbound connections from the server after page updates
SIEM Query:
source="web_logs" AND (url="*admin/pages*" AND (param="*<script>*" OR param="*javascript:*"))