CVE-2021-31342
📋 TL;DR
This vulnerability in Solid Edge's ugeom2d.dll library allows attackers to execute arbitrary code by exploiting improper validation in DFT file parsing. It affects all versions of Solid Edge SE2020 before 2020MP14 and SE2021 before SE2021MP5. Users who open malicious DFT files are at risk of complete system compromise.
💻 Affected Systems
- Solid Edge SE2020
- Solid Edge SE2021
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with attacker executing code as the current user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation or remote code execution when users open specially crafted DFT files, resulting in malware installation or data exfiltration.
If Mitigated
Limited impact with proper file validation and user awareness preventing malicious DFT files from being processed.
🎯 Exploit Status
Exploitation requires user interaction to open malicious DFT file. The vulnerability is well-documented and likely being exploited in targeted attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Solid Edge SE2020: 2020MP14 or later; Solid Edge SE2021: SE2021MP5 or later
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-21-159-09
Restart Required: Yes
Instructions:
1. Download latest Solid Edge update from Siemens support portal. 2. Close all Solid Edge applications. 3. Run the installer with administrative privileges. 4. Restart system after installation completes.
🔧 Temporary Workarounds
Block DFT file extensions
windowsPrevent processing of DFT files at the system or network level
Using Group Policy: Computer Configuration > Policies > Windows Settings > Security Settings > Software Restriction Policies > Additional Rules > New Path Rule: Path: *.dft, Security Level: Disallowed
User awareness training
allEducate users not to open DFT files from untrusted sources
🧯 If You Can't Patch
- Implement application whitelisting to prevent unauthorized Solid Edge execution
- Use email filtering to block DFT attachments and network monitoring for DFT file transfers
🔍 How to Verify
Check if Vulnerable:
Check Solid Edge version: Open Solid Edge > Help > About Solid Edge. If version is SE2020 before 2020MP14 or SE2021 before SE2021MP5, system is vulnerable.Check Version:
In Solid Edge: Help > About Solid Edge displays version informationVerify Fix Applied:
Verify version is SE2020 2020MP14+ or SE2021 SE2021MP5+ in Help > About Solid Edge. Test with known safe DFT files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Solid Edge crash logs with ugeom2d.dll errors
- Windows Application logs showing Solid Edge crashes during DFT file processing
- Unexpected Solid Edge process spawning child processes
Network Indicators:
- Unusual outbound connections from Solid Edge process
- DFT file downloads from untrusted sources
SIEM Query:
EventID=1000 AND Source="Application Error" AND ProcessName="edge.exe" AND FaultModuleName="ugeom2d.dll"