CVE-2024-6528
📋 TL;DR
This CVE describes a cross-site scripting (XSS) vulnerability in Schneider Electric products where attackers can inject malicious JavaScript into web pages. When victims visit compromised pages, their browsers execute arbitrary JavaScript code. This affects users of vulnerable Schneider Electric systems with web interfaces.
💻 Affected Systems
- Schneider Electric products with web interfaces (specific products not detailed in provided references)
📦 What is this software?
Modicon Lmc058 Firmware by Schneider Electric
Modicon M241 Firmware by Schneider Electric
Modicon M251 Firmware by Schneider Electric
Modicon M258 Firmware by Schneider Electric
Modicon M262 Firmware by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware through drive-by downloads.
Likely Case
Session hijacking, credential theft, or defacement of web interfaces through injected content.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity, especially reflected XSS where payloads can be delivered via URLs or forms.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2024-191-04&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2024-191-04.pdf
Restart Required: Yes
Instructions:
1. Review Schneider Electric advisory SEVD-2024-191-04. 2. Identify affected products and versions. 3. Apply vendor-provided patches or updates. 4. Restart affected systems as required.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add 'Content-Security-Policy: script-src 'self'' to HTTP headers
Input Validation Filtering
allFilter or block script tags and JavaScript events in user input
Implement input sanitization for <script>, javascript:, onload, onclick attributes
🧯 If You Can't Patch
- Isolate vulnerable systems from untrusted networks
- Implement web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Test web interfaces with XSS payloads like <script>alert('XSS')</script> in input fields and URL parametersCheck Version:
Check product documentation or web interface for version informationVerify Fix Applied:
Retest with XSS payloads after patching to confirm they are properly sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- Unusual long strings in URL parameters
- Script tags or JavaScript events in input fields
- Multiple failed input validation attempts
Network Indicators:
- HTTP requests containing script tags or JavaScript code in parameters
- Unusual redirects from legitimate pages
SIEM Query:
web.url:*script* OR web.url:*javascript:* OR web.url:*onclick* OR web.url:*onload*