CVE-2020-7556
📋 TL;DR
This vulnerability allows remote code execution through an out-of-bounds write when a malicious CGF file is imported into IGSS Definition software. Attackers can exploit this 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 lateral movement within industrial control networks.
Likely Case
Remote code execution allowing attackers to install malware, exfiltrate data, or disrupt industrial operations.
If Mitigated
Limited impact if proper network segmentation and file validation controls prevent malicious file imports.
🎯 Exploit Status
Exploitation requires user interaction to import malicious file; ZDI advisory suggests weaponization is likely given the RCE impact.
🛠️ 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. Install update following vendor instructions. 3. Restart system to complete installation.
🔧 Temporary Workarounds
Restrict CGF file imports
windowsBlock import of CGF files through application controls or user training
Network segmentation
allIsolate IGSS systems from untrusted networks
🧯 If You Can't Patch
- Implement strict file validation for CGF imports
- Restrict IGSS Definition to trusted users only and monitor for suspicious file imports
🔍 How to Verify
Check if Vulnerable:
Check IGSS Definition version in Help > About; if version is 14.0.0.20247, system is vulnerable.Check Version:
Check application version through Help > About menu in IGSS DefinitionVerify Fix Applied:
Verify version is 14.0.0.20248 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual CGF file import events
- Process creation from IGSS Definition executable
Network Indicators:
- Unexpected outbound connections from IGSS systems
- File transfers to IGSS hosts
SIEM Query:
Process creation where parent process contains 'def.exe' AND command line contains unusual parameters