CVE-2021-27397
📋 TL;DR
This vulnerability in Tecnomatix Plant Simulation allows attackers to execute arbitrary code by exploiting memory corruption when parsing malicious SPP files. All users of Plant Simulation versions before V16.0.5 are affected. The attacker needs to trick a user into opening a specially crafted SPP file.
💻 Affected Systems
- Siemens Tecnomatix Plant Simulation
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining the same privileges as the Plant Simulation process, potentially leading to lateral movement, data theft, or ransomware deployment.
Likely Case
Local privilege escalation or arbitrary code execution within the context of the Plant Simulation application, potentially compromising sensitive manufacturing data and simulation models.
If Mitigated
Limited impact if application runs with minimal privileges, network segmentation prevents lateral movement, and users are trained not to open untrusted files.
🎯 Exploit Status
Exploitation requires user interaction to open malicious SPP file. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V16.0.5 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-983548.pdf
Restart Required: Yes
Instructions:
1. Download Plant Simulation V16.0.5 or later from Siemens support portal. 2. Backup existing configurations and simulation files. 3. Run the installer with administrative privileges. 4. Restart the system after installation completes.
🔧 Temporary Workarounds
Restrict SPP file handling
windowsConfigure Windows to open SPP files with a different application or block execution of Plant Simulation for untrusted SPP files.
Use Windows Group Policy or application control to restrict SPP file associations
User training and file validation
allTrain users to only open SPP files from trusted sources and implement file validation procedures.
🧯 If You Can't Patch
- Run Plant Simulation with minimal user privileges (not as administrator)
- Implement application whitelisting to prevent execution of unauthorized code
🔍 How to Verify
Check if Vulnerable:
Check Plant Simulation version in Help > About menu. If version is below V16.0.5, system is vulnerable.Check Version:
Check application version via Help > About menu in Plant Simulation GUIVerify Fix Applied:
After patching, verify version shows V16.0.5 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Application crashes when opening SPP files
- Unexpected process creation from Plant Simulation
Network Indicators:
- Unusual outbound connections from Plant Simulation process
SIEM Query:
Process Creation where Image contains 'plantsim' AND CommandLine contains '.spp'