CVE-2023-40726
📋 TL;DR
QMS Automotive application servers before version V12.39 expose sensitive server information in responses, potentially enabling direct database access. This affects all QMS Automotive installations running versions older than V12.39.
💻 Affected Systems
- QMS Automotive
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain direct database access, leading to data theft, manipulation, or complete system compromise.
Likely Case
Information disclosure that enables further attacks, potentially leading to database access if other vulnerabilities exist.
If Mitigated
Limited information exposure with no direct database access due to network segmentation and access controls.
🎯 Exploit Status
Information disclosure vulnerability that requires no authentication and minimal technical skill to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V12.39 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-147266.pdf
Restart Required: Yes
Instructions:
1. Download QMS Automotive version V12.39 or later from Siemens. 2. Backup current installation. 3. Install the update following vendor instructions. 4. Restart the application server.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to QMS Automotive servers to only trusted networks
Web Application Firewall
allConfigure WAF to block requests that trigger information disclosure
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the QMS Automotive server
- Monitor server logs for unusual access patterns or information disclosure attempts
🔍 How to Verify
Check if Vulnerable:
Check QMS Automotive version in application interface or configuration files. If version is below V12.39, system is vulnerable.Check Version:
Check application documentation for version check method specific to your installation.Verify Fix Applied:
Confirm version is V12.39 or higher in application interface or configuration.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to application endpoints
- Requests that trigger server information disclosure
Network Indicators:
- Unusual traffic to QMS Automotive ports from unauthorized sources
SIEM Query:
source_ip OUTSIDE trusted_networks AND destination_port IN (qms_ports) AND response_size > threshold