CVE-2022-29876
📋 TL;DR
This vulnerability in SICAM T devices allows unauthenticated attackers to perform reflected cross-site scripting (XSS) attacks by injecting malicious scripts through GET request parameters. The injected content is directly reflected in the web server response without proper sanitization. All SICAM T devices running versions before V3.0 are affected.
💻 Affected Systems
- SICAM T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could execute arbitrary JavaScript in the context of authenticated users' browsers, potentially stealing session cookies, performing actions as the user, or redirecting to malicious sites.
Likely Case
Attackers could steal session cookies or authentication tokens, leading to unauthorized access to the SICAM T web interface and potential manipulation of industrial control systems.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be neutralized, preventing execution in users' browsers.
🎯 Exploit Status
The vulnerability requires no authentication and exploitation is straightforward once the vulnerable parameter is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V3.0 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-165073.html
Restart Required: Yes
Instructions:
1. Download SICAM T version V3.0 or later from Siemens support portal. 2. Backup current configuration. 3. Apply the firmware update following Siemens documentation. 4. Restart the device. 5. Verify the update was successful.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy a WAF with XSS protection rules to filter malicious requests before they reach the SICAM T device.
Network Segmentation
allRestrict access to SICAM T web interface to trusted networks only, preventing external attackers from reaching the vulnerable endpoint.
🧯 If You Can't Patch
- Implement strict network access controls to limit SICAM T web interface access to authorized personnel only
- Deploy a reverse proxy with input validation and output encoding to sanitize requests before they reach the vulnerable device
🔍 How to Verify
Check if Vulnerable:
Test by sending a GET request with a simple XSS payload in parameters and checking if it's reflected unsanitized in the response.Check Version:
Check the device web interface or use Siemens diagnostic tools to query the firmware version.Verify Fix Applied:
After updating to V3.0+, test with the same XSS payloads and verify they are properly sanitized or blocked in the response.📡 Detection & Monitoring
Log Indicators:
- Unusual GET requests with script tags or JavaScript in parameters
- Multiple failed login attempts following suspicious GET requests
Network Indicators:
- HTTP requests containing <script>, javascript:, or other XSS payloads in URL parameters directed at SICAM T devices
SIEM Query:
source_ip="*" AND destination_ip="SICAM_T_IP" AND http_method="GET" AND (url="*<script>*" OR url="*javascript:*" OR url="*onerror=*" OR url="*onload=*")