CVE-2021-22750
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code or cause data loss by exploiting an out-of-bounds write flaw in Schneider Electric's IGSS Definition software. Attackers can achieve this by tricking users into importing a malicious CGF file. Organizations using IGSS Definition versions 15.0.0.21041 and earlier are affected.
💻 Affected Systems
- Schneider Electric IGSS Definition (Def.exe)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with system-level privileges, potentially leading to complete system compromise, data theft, or disruption of industrial operations.
Likely Case
Application crash and data loss from corrupted files, with potential for limited code execution in the context of the IGSS Definition process.
If Mitigated
No impact if malicious CGF files are prevented from reaching vulnerable systems through proper security controls.
🎯 Exploit Status
Requires user interaction to import malicious file. Exploit development requires understanding of CGF file format and memory corruption techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after V15.0.0.21041
Vendor Advisory: http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-159-01
Restart Required: Yes
Instructions:
1. Download updated IGSS Definition software from Schneider Electric. 2. Install the update following vendor instructions. 3. Restart the system to ensure changes take effect.
🔧 Temporary Workarounds
Restrict CGF file imports
windowsBlock or restrict the ability to import CGF files through application policies or user training.
Application whitelisting
windowsImplement application control to prevent execution of unauthorized or modified IGSS Definition components.
🧯 If You Can't Patch
- Implement strict file validation for CGF imports using external tools or scripts
- Isolate IGSS Definition systems from untrusted networks and implement network segmentation
🔍 How to Verify
Check if Vulnerable:
Check IGSS Definition version by right-clicking Def.exe → Properties → Details tab, or check installed programs in Control Panel.Check Version:
wmic product where name="IGSS Definition" get versionVerify Fix Applied:
Verify version is newer than V15.0.0.21041 and test CGF file import functionality with known safe files.📡 Detection & Monitoring
Log Indicators:
- Failed CGF file imports
- Application crashes in IGSS Definition logs
- Unusual process creation from Def.exe
Network Indicators:
- Unexpected file transfers to IGSS systems
- Network traffic patterns indicating file import attempts
SIEM Query:
source="*IGSS*" AND (event_id=1000 OR event_id=1001) AND process_name="Def.exe"