CVE-2021-46161
📋 TL;DR
This vulnerability allows remote code execution through specially crafted NEU files in Simcenter Femap engineering software. Attackers can exploit an out-of-bounds write vulnerability to execute arbitrary code with the privileges of the current user. Organizations using affected Simcenter Femap versions for engineering analysis are at risk.
💻 Affected Systems
- Simcenter Femap
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution leading to data theft, lateral movement, or ransomware deployment.
Likely Case
Local privilege escalation leading to unauthorized access to engineering data and system resources.
If Mitigated
Limited impact if proper file validation and least privilege principles are enforced.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious file. No public exploit code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to V2022.1 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-609880.pdf
Restart Required: Yes
Instructions:
1. Download latest Simcenter Femap version from Siemens support portal. 2. Install update following vendor instructions. 3. Restart affected systems.
🔧 Temporary Workarounds
Restrict NEU file processing
windowsBlock or restrict processing of NEU files from untrusted sources
Run with reduced privileges
windowsRun Femap with standard user privileges instead of administrative rights
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized code
- Use network segmentation to isolate engineering workstations from critical systems
🔍 How to Verify
Check if Vulnerable:
Check Femap version via Help > About menu. Vulnerable if version is 2020.2.x or 2021.1.x.Check Version:
Not applicable - check via GUI Help > About menuVerify Fix Applied:
Verify version is 2022.1 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes of femap.exe
- Suspicious file parsing errors in application logs
Network Indicators:
- Unusual outbound connections from engineering workstations
SIEM Query:
Process: femap.exe AND (EventID: 1000 OR EventID: 1001) OR File: *.neu from untrusted sources