CVE-2024-6179
📋 TL;DR
This reflected cross-site scripting (XSS) vulnerability in LG SuperSign CMS allows attackers to inject malicious scripts into web pages viewed by users. Attackers can steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. All organizations using affected versions of LG SuperSign CMS are vulnerable.
💻 Affected Systems
- LG SuperSign CMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator credentials, gain full control of the SuperSign CMS, compromise connected digital signage displays, and potentially pivot to internal networks.
Likely Case
Attackers steal user session cookies to impersonate authenticated users, deface digital signage content, or redirect users to phishing sites.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before reaching users, preventing exploitation.
🎯 Exploit Status
Reflected XSS typically requires user interaction (clicking a malicious link) but is technically simple to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3.1 or later
Vendor Advisory: https://lgsecurity.lge.com/bulletins/idproducts#updateDetails
Restart Required: Yes
Instructions:
1. Download SuperSign CMS version 4.3.1 or later from LG's official portal. 2. Backup current configuration and data. 3. Install the update following LG's installation guide. 4. Restart the SuperSign CMS service.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy a WAF with XSS protection rules to filter malicious input before it reaches the application.
Input Validation Filter
allImplement server-side input validation to reject or sanitize suspicious parameters containing script tags.
🧯 If You Can't Patch
- Isolate SuperSign CMS to internal network only, blocking external access.
- Implement strict Content Security Policy (CSP) headers to restrict script execution sources.
🔍 How to Verify
Check if Vulnerable:
Check SuperSign CMS version via web interface or configuration files. If version is between 4.1.3 and 4.3.0 (exclusive), it's vulnerable.Check Version:
Check web interface admin panel or configuration files for version information.Verify Fix Applied:
Confirm version is 4.3.1 or higher. Test XSS payloads in input fields to ensure they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual long URLs with script tags in web server logs
- Multiple failed login attempts from single IP
Network Indicators:
- HTTP requests containing <script> tags or javascript: URIs
- Unexpected redirects to external domains
SIEM Query:
source="webserver.log" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")