CVE-2023-24482
📋 TL;DR
This CVE describes a critical buffer overflow vulnerability in COMOS software's cache validation service. Attackers can exploit this Structured Exception Handler (SEH) based overflow to execute arbitrary code or cause denial of service on affected systems. All users running vulnerable COMOS versions are affected.
💻 Affected Systems
- COMOS V10.2
- COMOS V10.3.3.1
- COMOS V10.3.3.2
- COMOS V10.3.3.3
- COMOS V10.3.3.4
- COMOS V10.4.0.0
- COMOS V10.4.1.0
- COMOS V10.4.2.0
📦 What is this software?
Comos by Siemens
Comos by Siemens
Comos by Siemens
Comos by Siemens
Comos by Siemens
Comos by Siemens
Comos by Siemens
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with remote code execution leading to complete control of the target system, data theft, and lateral movement within the network.
Likely Case
Remote code execution allowing attackers to install malware, steal sensitive engineering data, or disrupt industrial operations.
If Mitigated
Denial of service affecting COMOS functionality but limited to the application layer if proper network segmentation and access controls are in place.
🎯 Exploit Status
Buffer overflow vulnerabilities with CVSS 10.0 scores are typically easy to exploit once details become public. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: COMOS V10.3.3.1.45, V10.3.3.2.33, V10.3.3.3.9, V10.3.3.4.6, V10.4.0.0.31, V10.4.1.0.32, V10.4.2.0.25 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-693110.pdf
Restart Required: Yes
Instructions:
1. Download the appropriate patch from Siemens support portal. 2. Backup COMOS configuration and data. 3. Apply the patch following Siemens installation instructions. 4. Restart the COMOS service and verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate COMOS systems from untrusted networks and internet access
Access Control Restrictions
allImplement strict firewall rules to limit access to COMOS cache validation service ports
🧯 If You Can't Patch
- Implement network segmentation to isolate COMOS systems from production networks
- Deploy intrusion detection/prevention systems to monitor for buffer overflow attempts
🔍 How to Verify
Check if Vulnerable:
Check COMOS version against affected versions list. Review system logs for abnormal cache validation service activity.Check Version:
Check COMOS About dialog or consult Siemens documentation for version verification commands specific to your installation.Verify Fix Applied:
Verify COMOS version is at or above the patched versions listed in the fix section. Test cache validation service functionality.📡 Detection & Monitoring
Log Indicators:
- Abnormal process crashes in COMOS cache validation service
- Unusual network connections to COMOS service ports
- Memory access violation errors in application logs
Network Indicators:
- Unexpected traffic to COMOS cache validation service ports
- Patterns consistent with buffer overflow exploitation attempts
SIEM Query:
source="COMOS" AND (event_type="crash" OR error="access_violation" OR error="buffer_overflow")