CVE-2025-2864
📋 TL;DR
CVE-2025-2864 is a reflected cross-site scripting (XSS) vulnerability in SaTECH BCU firmware version 2.1.3 that allows attackers to inject malicious scripts into legitimate websites controlling the device. This affects users accessing the BCU web interface through their browsers. The attack requires cookie manipulation and only impacts the victim's browser session.
💻 Affected Systems
- SaTECH BCU
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals session cookies, hijacks administrative sessions, performs unauthorized device configuration changes, or redirects users to malicious sites.
Likely Case
Session hijacking leading to unauthorized access to the BCU web interface and potential device configuration changes.
If Mitigated
Limited impact with proper input validation and output encoding in place; attacker gains no persistent access.
🎯 Exploit Status
Requires cookie manipulation and user interaction; reflected XSS typically has low exploitation complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-arteches-satech-bcu
Restart Required: Yes
Instructions:
1. Monitor vendor for firmware updates. 2. Apply patch when available. 3. Restart device after patching.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add 'Content-Security-Policy: default-src 'self'' to web server headers
Input Validation Filtering
allImplement server-side input validation and output encoding
Implement proper HTML encoding for all user inputs before rendering
🧯 If You Can't Patch
- Restrict network access to BCU web interface using firewall rules
- Implement web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Test web interface with XSS payloads in cookie parameters; check if scripts execute in browser.Check Version:
Check firmware version in web interface settings or via device console.Verify Fix Applied:
Retest with XSS payloads after applying fixes; verify scripts do not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual cookie parameter values in web server logs
- Multiple failed login attempts with suspicious parameters
Network Indicators:
- HTTP requests with suspicious cookie values containing script tags
- Unusual traffic patterns to BCU web interface
SIEM Query:
source="web_logs" AND (uri="*<script>*" OR cookie="*<script>*")