CVE-2020-7558
📋 TL;DR
This vulnerability allows remote code execution through an out-of-bounds write in Schneider Electric's IGSS Definition software. Attackers can exploit it by tricking users into importing a malicious configuration file, potentially gaining full control of affected systems. Organizations using 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 administrative privileges, data theft, lateral movement within network, and persistent backdoor installation.
Likely Case
Local privilege escalation leading to system control, data manipulation in industrial control systems, and disruption of operational processes.
If Mitigated
Limited impact with proper network segmentation, file validation, and user privilege restrictions preventing successful exploitation.
🎯 Exploit Status
Exploitation requires user interaction but is straightforward once malicious file is imported. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to 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 version from Schneider Electric portal. 2. Backup current configuration. 3. Install update. 4. Restart system. 5. Verify version.
🔧 Temporary Workarounds
Restrict CGF file imports
windowsBlock import of CGF files through application settings or group policy
User training and awareness
allTrain users to only import configuration files from trusted sources
🧯 If You Can't Patch
- Implement strict network segmentation to isolate IGSS systems
- Use application whitelisting to prevent unauthorized execution
🔍 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:
Not applicable - check through application GUIVerify Fix Applied:
Verify version is 14.0.0.20248 or higher in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual CGF file import activity
- Process creation from IGSS Definition with suspicious parameters
Network Indicators:
- Unexpected outbound connections from IGSS systems
- File transfers to/from IGSS Definition
SIEM Query:
Process creation where parent process contains 'def.exe' AND command line contains unusual parameters