CVE-2024-26156
📋 TL;DR
ETIC Telecom Remote Access Server (RAS) versions before 4.5.0 are vulnerable to reflected cross-site scripting (XSS) attacks via the method parameter. This allows attackers to inject malicious scripts that execute in users' browsers when they visit crafted URLs. Organizations using ETIC RAS for remote access are affected.
💻 Affected Systems
- ETIC Telecom Remote Access Server (RAS)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on client systems.
Likely Case
Session hijacking leading to unauthorized access to the RAS interface and potentially connected systems.
If Mitigated
Limited impact if proper input validation, output encoding, and Content Security Policy are implemented.
🎯 Exploit Status
Reflected XSS typically requires user interaction (clicking malicious link) but is straightforward to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.5.0
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-22-307-01
Restart Required: Yes
Instructions:
1. Download ETIC RAS version 4.5.0 or later from vendor. 2. Backup current configuration. 3. Apply update following vendor instructions. 4. Restart the RAS service or device. 5. Verify update completed successfully.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy WAF with XSS protection rules to filter malicious input.
Input Validation Filter
allImplement proxy or middleware to sanitize method parameter inputs.
🧯 If You Can't Patch
- Isolate ETIC RAS behind reverse proxy with input sanitization.
- Implement strict Content Security Policy headers.
🔍 How to Verify
Check if Vulnerable:
Test by injecting script payload in method parameter: <script>alert('XSS')</script> and check if it executes.Check Version:
Check web interface or administrative console for version information (typically in About or Status page).Verify Fix Applied:
After patching, repeat XSS test - script should not execute and input should be properly encoded.📡 Detection & Monitoring
Log Indicators:
- Unusual long or script-like strings in method parameter logs
- Multiple failed XSS attempts
Network Indicators:
- HTTP requests containing script tags in method parameter
- Unusual redirects from RAS interface
SIEM Query:
source="etic_ras" AND (method="*<script>*" OR method="*javascript:*")