CVE-2025-41749
📋 TL;DR
An unauthenticated cross-site scripting (XSS) vulnerability in port_util.php allows attackers to trick authenticated users into clicking malicious links, enabling unauthorized changes to device configuration parameters accessible through the web-based management interface. This affects systems running vulnerable versions of the software with web-based management enabled. The vulnerability does not allow system-level access or session hijacking due to httpOnly cookie protection.
💻 Affected Systems
- Specific product information not provided in CVE description
📦 What is this software?
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⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify critical device configuration settings, potentially disrupting operations or enabling further attacks by changing network settings, access controls, or security parameters.
Likely Case
Attackers trick authenticated administrators into clicking malicious links, leading to unauthorized configuration changes that could affect device functionality or security settings.
If Mitigated
With proper user awareness training and network segmentation, impact is limited to configuration changes that can be audited and reverted by administrators.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users into clicking malicious links. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://certvde.com/de/advisories/VDE-2025-071
Restart Required: No
Instructions:
1. Check vendor advisory for patch availability. 2. Apply vendor-provided security updates. 3. Verify patch installation. 4. Test web interface functionality.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement proper input validation and output encoding in port_util.php to prevent XSS payload execution
Not applicable - requires code changes
Web Application Firewall
allDeploy WAF with XSS protection rules to block malicious requests
Not applicable - configuration dependent
🧯 If You Can't Patch
- Restrict access to web-based management interface using network segmentation and firewall rules
- Implement user awareness training about phishing and suspicious links in management interfaces
🔍 How to Verify
Check if Vulnerable:
Check if port_util.php exists in web directory and test for XSS vulnerabilities using security scanners or manual testing with payloads like <script>alert('XSS')</script>Check Version:
Check software version through web interface or system documentationVerify Fix Applied:
Test with XSS payloads after patch application to confirm they are properly sanitized and do not execute📡 Detection & Monitoring
Log Indicators:
- Unusual parameter values in port_util.php requests
- Multiple failed attempts with script tags in parameters
- Configuration changes from unexpected sources
Network Indicators:
- HTTP requests to port_util.php with script tags or encoded payloads in parameters
- Unusual traffic patterns to management interface
SIEM Query:
source="web_logs" AND uri="*port_util.php*" AND (param="*<script>*" OR param="*javascript:*" OR param="*onerror=*" OR param="*onload=*")