CVE-2022-29878
📋 TL;DR
This vulnerability allows unauthenticated attackers to bypass authentication on SICAM T devices by capturing and replaying challenge-response pairs. Attackers can gain access to the management interface by waiting for a previously captured challenge to reappear. 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
Complete compromise of device management interface leading to unauthorized configuration changes, disruption of operations, or lateral movement within industrial control systems.
Likely Case
Unauthorized access to management interface allowing configuration changes, monitoring of sensitive data, or disruption of device functionality.
If Mitigated
Limited impact if devices are isolated from untrusted networks and have additional authentication layers.
🎯 Exploit Status
Attack requires network access to capture challenge-response pairs and repeated connection attempts to wait for known challenge.
🛠️ 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 V3.0 or later from Siemens support portal. 2. Backup current configuration. 3. Apply firmware update following Siemens documentation. 4. Verify successful update and restore configuration if needed.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SICAM T devices from untrusted networks and restrict access to management interfaces.
Access Control Lists
allImplement strict firewall rules to limit which IP addresses can access the management interface.
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable devices from untrusted networks
- Deploy intrusion detection systems to monitor for authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is below V3.0, device is vulnerable.Check Version:
Check via web interface at http(s)://device-ip/ or consult Siemens documentation for CLI commands.Verify Fix Applied:
Verify firmware version is V3.0 or higher via device interface or management software.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful login from same IP
- Authentication requests with unusual timing patterns
Network Indicators:
- Repeated HTTP/HTTPS requests to management interface from external IPs
- Unusual traffic patterns to challenge-response endpoints
SIEM Query:
source_ip=external AND dest_port=80,443 AND url_path CONTAINS 'login' OR 'challenge' AND count > threshold