CVE-2021-25665
📋 TL;DR
This vulnerability in Simcenter STAR-CCM+ Viewer allows attackers to execute arbitrary code by exploiting improper validation of scene files. It affects all versions before V2021.2.1 and could lead to complete system compromise when malicious files are opened.
💻 Affected Systems
- Simcenter STAR-CCM+ Viewer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining same privileges as the user running starview+.exe, potentially leading to lateral movement, data theft, or ransomware deployment.
Likely Case
Local privilege escalation or remote code execution when users open malicious scene files, potentially leading to malware installation or data exfiltration.
If Mitigated
Limited impact with proper network segmentation, least privilege, and file validation controls in place.
🎯 Exploit Status
Exploitation requires user interaction to open malicious scene files. No public exploit code is available, but the vulnerability is well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V2021.2.1 and later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-109294.pdf
Restart Required: Yes
Instructions:
1. Download V2021.2.1 or later from Siemens support portal. 2. Run installer with administrative privileges. 3. Restart affected systems. 4. Verify installation by checking version.
🔧 Temporary Workarounds
Restrict scene file execution
windowsBlock execution of starview+.exe from untrusted locations or implement application whitelisting
Windows: Use AppLocker or Software Restriction Policies to restrict starview+.exe execution
File type association removal
windowsRemove file associations for scene files with starview+.exe to prevent automatic opening
Windows: assoc .scn=
Windows: ftype SimcenterSceneFile=
🧯 If You Can't Patch
- Implement strict network segmentation to isolate systems running vulnerable versions
- Apply principle of least privilege: run starview+.exe with minimal user permissions
🔍 How to Verify
Check if Vulnerable:
Check Simcenter STAR-CCM+ Viewer version via Help > About or command line: starview+ --versionCheck Version:
starview+ --versionVerify Fix Applied:
Verify version is V2021.2.1 or later and test opening known safe scene files📡 Detection & Monitoring
Log Indicators:
- Application crashes of starview+.exe
- Unexpected process creation from starview+.exe
- Failed scene file parsing attempts
Network Indicators:
- Unusual outbound connections from systems running starview+.exe
- Scene file downloads from untrusted sources
SIEM Query:
Process:starview+.exe AND (EventID:1000 OR ParentProcess!="explorer.exe")