CVE-2021-25670
📋 TL;DR
CVE-2021-25670 is an out-of-bounds write vulnerability in Tecnomatix RobotExpert that allows attackers to execute arbitrary code by exploiting improper validation of CELL files. All versions before V16.1 are affected. This vulnerability enables remote code execution in the context of the current process.
💻 Affected Systems
- Siemens Tecnomatix RobotExpert
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through remote code execution, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local privilege escalation or remote code execution if an attacker can deliver a malicious CELL file to a user or automated system.
If Mitigated
Limited impact with proper network segmentation, application whitelisting, and user privilege restrictions.
🎯 Exploit Status
Exploitation requires delivering a malicious CELL file to the target system; no public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V16.1 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-163226.pdf
Restart Required: Yes
Instructions:
1. Download Tecnomatix RobotExpert V16.1 or later from Siemens support portal. 2. Install the update following Siemens installation procedures. 3. Restart the system to complete the update.
🔧 Temporary Workarounds
Restrict CELL file processing
allBlock or restrict processing of CELL files from untrusted sources
Application control policies
windowsImplement application whitelisting to prevent unauthorized execution
🧯 If You Can't Patch
- Implement strict network segmentation to isolate RobotExpert systems
- Apply principle of least privilege to user accounts running RobotExpert
🔍 How to Verify
Check if Vulnerable:
Check RobotExpert version via Help > About; versions below V16.1 are vulnerable.Check Version:
Not applicable - check via application GUI Help > AboutVerify Fix Applied:
Verify version is V16.1 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from RobotExpert
- Failed CELL file parsing attempts
- Crash logs from RobotExpert
Network Indicators:
- Unexpected network connections from RobotExpert process
- CELL file transfers from untrusted sources
SIEM Query:
Process creation where parent_process contains 'RobotExpert' AND (process_name contains 'cmd.exe' OR process_name contains 'powershell.exe')