CVE-2021-41539
📋 TL;DR
This vulnerability in Solid Edge SE2021 allows attackers to execute arbitrary code by exploiting a use-after-free bug when parsing malicious OBJ files. Users who open specially crafted OBJ files with vulnerable versions of Solid Edge are affected. The vulnerability enables code execution within the context of the current process.
💻 Affected Systems
- Solid Edge SE2021
📦 What is this software?
Solid Edge by Siemens
Solid Edge by Siemens
Solid Edge by Siemens
Solid Edge by Siemens
Solid Edge by Siemens
Solid Edge by Siemens
Solid Edge by Siemens
Solid Edge by Siemens
Solid Edge by Siemens
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation or malware execution when users open malicious OBJ files, potentially leading to data exfiltration or system compromise.
If Mitigated
Limited impact with proper file validation and user awareness training, potentially only causing application crashes.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious OBJ file. The vulnerability is memory corruption-based requiring specific heap manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SE2021MP8 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-728618.pdf
Restart Required: Yes
Instructions:
1. Download and install Solid Edge SE2021 Maintenance Pack 8 (SE2021MP8) or later from Siemens support portal. 2. Close all Solid Edge instances before installation. 3. Follow the installation wizard. 4. Restart the system after installation completes.
🔧 Temporary Workarounds
Block OBJ file extensions
windowsPrevent Solid Edge from opening OBJ files via group policy or application restrictions
User awareness training
allTrain users not to open OBJ files from untrusted sources
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of malicious payloads
- Use network segmentation to isolate Solid Edge workstations from critical systems
🔍 How to Verify
Check if Vulnerable:
Check Solid Edge version via Help > About Solid Edge. If version is earlier than SE2021MP8, the system is vulnerable.Check Version:
Not applicable - check via Solid Edge GUI Help > About menuVerify Fix Applied:
Verify version shows SE2021MP8 or later in Help > About Solid Edge. Test with known safe OBJ files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Application crashes when opening OBJ files
- Unexpected process creation from sedge.exe
Network Indicators:
- OBJ file downloads from untrusted sources
- Outbound connections from Solid Edge process
SIEM Query:
Process Creation: ParentImage contains "sedge.exe" AND NOT (CommandLine contains expected_patterns)