CVE-2020-7554
📋 TL;DR
This vulnerability allows remote code execution when a malicious CGF (Configuration Group File) is imported into IGSS Definition software. Attackers can exploit this buffer overflow to execute arbitrary code on affected systems. Organizations using Schneider Electric's IGSS Definition version 14.0.0.20247 are affected.
💻 Affected Systems
- Schneider Electric IGSS Definition
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the IGSS Definition host, potentially leading to industrial control system disruption or lateral movement within OT networks.
Likely Case
Remote code execution leading to data theft, malware deployment, or disruption of industrial visualization and monitoring functions.
If Mitigated
Limited impact with proper network segmentation and file validation controls preventing malicious CGF file delivery.
🎯 Exploit Status
Exploitation requires user to import malicious CGF file; buffer overflow vulnerability with known exploitation patterns.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 14.0.0.20248 or later
Vendor Advisory: https://www.se.com/ww/en/download/document/SEVD-2020-315-03/
Restart Required: Yes
Instructions:
1. Download updated IGSS Definition from Schneider Electric portal. 2. Backup current configuration. 3. Install update. 4. Restart system. 5. Verify version is 14.0.0.20248 or higher.
🔧 Temporary Workarounds
Restrict CGF file imports
windowsImplement policies to prevent import of untrusted CGF files through user training and technical controls.
Network segmentation
allIsolate IGSS Definition systems from untrusted networks and implement strict firewall rules.
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized code
- Deploy endpoint detection and response (EDR) solutions with memory protection capabilities
🔍 How to Verify
Check if Vulnerable:
Check IGSS Definition version in Help > About; if version is exactly 14.0.0.20247, system is vulnerable.Check Version:
Check Help > About in IGSS Definition GUI or examine program files version information.Verify Fix Applied:
Verify version is 14.0.0.20248 or higher in Help > About dialog.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Def.exe
- Failed CGF file import attempts
- Memory access violations in application logs
Network Indicators:
- Unexpected network connections from IGSS Definition process
- File transfers to IGSS Definition on port 12397 (default IGSS port)
SIEM Query:
Process Creation where Parent Process contains 'Def.exe' AND Command Line contains unusual parameters