CVE-2020-27001
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code by exploiting a stack-based buffer overflow in JT2Go and Teamcenter Visualization software when parsing malicious PAR files. Affected users are those running vulnerable versions of these Siemens applications. The vulnerability requires user interaction to open a specially crafted file.
💻 Affected Systems
- JT2Go
- Teamcenter Visualization
📦 What is this software?
Jt2go by Siemens
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local code execution with user privileges, allowing attackers to steal sensitive data, install malware, or pivot to other systems.
If Mitigated
Limited impact with proper application sandboxing and least privilege principles, potentially only crashing the application.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious file. No public exploit code is available as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V13.1.0.2 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-663999.pdf
Restart Required: Yes
Instructions:
1. Download the latest version from Siemens support portal. 2. Backup current configuration. 3. Install the update. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict PAR file handling
windowsBlock or restrict opening of PAR files through application settings or group policy
Application sandboxing
windowsRun affected applications in isolated environments with restricted permissions
🧯 If You Can't Patch
- Implement strict file type restrictions to prevent opening untrusted PAR files
- Run applications with least privilege user accounts and enable application control policies
🔍 How to Verify
Check if Vulnerable:
Check Help > About in JT2Go or Teamcenter Visualization and verify version is below V13.1.0.2Check Version:
Not applicable - check via application GUIVerify Fix Applied:
Verify version is V13.1.0.2 or higher in Help > About menu📡 Detection & Monitoring
Log Indicators:
- Application crashes when opening PAR files
- Unusual process creation from JT2Go or Teamcenter Visualization
Network Indicators:
- Unusual outbound connections from affected applications
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName contains 'jt2go' OR 'teamcenter'🔗 References
- https://cert-portal.siemens.com/productcert/pdf/ssa-663999.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-695540.pdf
- https://www.zerodayinitiative.com/advisories/ZDI-21-227/
- https://cert-portal.siemens.com/productcert/pdf/ssa-663999.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-695540.pdf
- https://www.zerodayinitiative.com/advisories/ZDI-21-227/
