CVE-2020-7550
📋 TL;DR
This vulnerability allows remote code execution when a malicious CGF file is imported into IGSS Definition software. Attackers can exploit a buffer overflow weakness to execute arbitrary code on affected systems. Users of Schneider Electric IGSS Definition version 14.0.0.20247 and earlier are affected.
💻 Affected Systems
- Schneider Electric IGSS Definition
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, steal data, pivot to other systems, or disrupt industrial operations.
Likely Case
Attackers gain control of the IGSS Definition workstation, potentially accessing SCADA/HMI systems and industrial networks.
If Mitigated
Limited impact with proper network segmentation and file validation controls in place.
🎯 Exploit Status
Exploitation requires user interaction to import malicious file; no authentication bypass needed for file import functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 14.0.0.20248 and 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. Install update following vendor instructions. 3. Restart system after installation.
🔧 Temporary Workarounds
Restrict CGF file imports
windowsBlock import of CGF files through application configuration or group policy
User awareness training
allTrain users to only import CGF files from trusted sources
🧯 If You Can't Patch
- Implement strict file validation for CGF imports using application whitelisting
- Segment IGSS Definition systems from critical networks and implement network monitoring
🔍 How to Verify
Check if Vulnerable:
Check IGSS Definition version in Help > About; if version is 14.0.0.20247 or earlier, system is vulnerable.Check Version:
Check application version via Help > About in IGSS Definition GUIVerify Fix Applied:
Verify version is 14.0.0.20248 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Def.exe
- Failed CGF file import attempts
- Memory access violations in application logs
Network Indicators:
- Unexpected outbound connections from IGSS Definition system
- 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