CVE-2022-29882
📋 TL;DR
This vulnerability in SICAM T devices allows unauthenticated attackers to upload malicious files that can execute cross-site scripting (XSS) attacks. When legitimate users access error logs, the stored XSS payload can perform arbitrary actions in their name. All SICAM T versions before V3.0 are affected.
💻 Affected Systems
- SICAM T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could perform administrative actions, steal credentials, or compromise the entire SICAM T system by executing arbitrary JavaScript in the context of authenticated users.
Likely Case
Attackers would typically steal session cookies or perform limited actions within the web interface, potentially gaining unauthorized access to the system.
If Mitigated
With proper input validation and output encoding, the XSS payload would be rendered harmless as plain text rather than executable code.
🎯 Exploit Status
The vulnerability requires file upload capability and subsequent access to error logs by legitimate users, but the exploit itself is straightforward once these conditions are met.
🛠️ 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
Restrict network access
allLimit access to SICAM T web interface to trusted networks only
Disable file upload functionality
allIf possible, disable file upload features in the web interface
🧯 If You Can't Patch
- Implement network segmentation to isolate SICAM T devices from untrusted networks
- Deploy a web application firewall (WAF) with XSS protection rules in front of the SICAM T interface
🔍 How to Verify
Check if Vulnerable:
Check the SICAM T firmware version via the web interface or device console. If version is below V3.0, the device is vulnerable.Check Version:
Check via web interface at System > About or use device-specific console commands (varies by model)Verify Fix Applied:
After updating, verify the firmware version shows V3.0 or higher in the device interface.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to the web interface
- JavaScript payloads in error logs
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to file upload endpoints from untrusted sources
- Suspicious JavaScript in HTTP traffic
SIEM Query:
source="sicam_t" AND (http_method="POST" AND uri="*upload*" OR message="*script*" OR message="*javascript*")