CVE-2024-31853
📋 TL;DR
SICAM TOOLBOX II fails to validate extended key usage attributes in TLS certificates, allowing attackers to perform man-in-the-middle attacks. This affects all versions before V07.11 of Siemens' SICAM TOOLBOX II software used for managing power automation devices.
💻 Affected Systems
- SICAM TOOLBOX II
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of communications between SICAM TOOLBOX II and managed devices, enabling data interception, manipulation of configuration/control commands, and potential disruption of power automation systems.
Likely Case
Interception of sensitive operational data, unauthorized access to device configurations, and potential manipulation of monitoring data without detection.
If Mitigated
Limited impact if network segmentation prevents attacker access to communication paths between the toolbox and managed devices.
🎯 Exploit Status
Requires attacker to be on-path between SICAM TOOLBOX II and managed device, plus ability to present malicious certificate.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V07.11 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-183963.html
Restart Required: Yes
Instructions:
1. Download SICAM TOOLBOX II V07.11 or later from Siemens support portal
2. Backup existing configuration and data
3. Install the updated version following Siemens installation guide
4. Restart the system and verify functionality
🔧 Temporary Workarounds
Network Segmentation
allIsolate SICAM TOOLBOX II and managed devices on dedicated network segments with strict access controls.
Certificate Pinning
allImplement certificate pinning for managed device connections if supported by the application.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SICAM TOOLBOX II communications from untrusted networks
- Monitor network traffic for unexpected TLS certificate changes or man-in-the-middle indicators
🔍 How to Verify
Check if Vulnerable:
Check SICAM TOOLBOX II version in application about dialog or installation directory; versions below V07.11 are vulnerable.Check Version:
Check Help > About in SICAM TOOLBOX II application or examine installed program version in Windows Control Panel.Verify Fix Applied:
Verify installed version is V07.11 or later and test TLS connections to managed devices while monitoring certificate validation.📡 Detection & Monitoring
Log Indicators:
- Unexpected certificate changes in TLS handshake logs
- Failed or unusual certificate validation events
- Connection attempts from unexpected network locations
Network Indicators:
- Unusual TLS handshake patterns
- Certificate mismatches between expected and presented certificates
- Traffic interception patterns in network monitoring
SIEM Query:
source="network_traffic" AND (event_type="tls_handshake" AND certificate_validation="failed") OR (event_type="connection" AND dest_port=443 AND src_ip NOT IN allowed_ips)