CVE-2021-22709
📋 TL;DR
This vulnerability in Schneider Electric's IGSC SCADA system allows attackers to execute arbitrary code or cause data loss by importing a malicious configuration file. It affects IGSS Definition versions 15.0.0.21041 and earlier. Industrial control system operators using vulnerable versions are at risk.
💻 Affected Systems
- Interactive Graphical SCADA System (IGSS) Definition
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, SCADA system manipulation, and potential physical process disruption.
Likely Case
Data loss or corruption of SCADA configuration files, requiring system restoration and operational downtime.
If Mitigated
Limited impact with proper file validation and restricted import permissions, potentially causing minor configuration issues.
🎯 Exploit Status
Requires attacker to craft malicious CGF file and have it imported by authorized user or system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after V15.0.0.21041
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-068-01
Restart Required: Yes
Instructions:
1. Download updated IGSS Definition software from Schneider Electric portal. 2. Backup current configuration. 3. Install update following vendor instructions. 4. Restart system. 5. Verify version is updated.
🔧 Temporary Workarounds
Restrict CGF file imports
windowsLimit who can import configuration files and implement approval process for all imports.
File validation
allImplement file integrity checking and validation for all CGF files before import.
🧯 If You Can't Patch
- Implement strict access controls on IGSS Definition component and configuration import functionality.
- Monitor for unauthorized file imports and implement application whitelisting to prevent execution of malicious code.
🔍 How to Verify
Check if Vulnerable:
Check IGSS Definition version in application about dialog or installation directory properties.Check Version:
Check application version via Windows Programs and Features or application Help > About menu.Verify Fix Applied:
Verify version number is greater than V15.0.0.21041 and test CGF file import functionality.📡 Detection & Monitoring
Log Indicators:
- Failed or unusual CGF file import attempts
- Unexpected process creation from Def.exe
Network Indicators:
- Unusual file transfers to SCADA systems
- Anomalous network connections from SCADA hosts
SIEM Query:
source="windows" AND process="Def.exe" AND (event_id=4688 OR event_id=4689) AND command_line CONTAINS "CGF"