CVE-2021-22778
📋 TL;DR
This vulnerability allows unauthorized users to read or modify protected function blocks in Schneider Electric industrial control software when accessing project files. It affects EcoStruxure Control Expert, EcoStruxure Process Expert, and SCADAPack RemoteConnect systems. Attackers could potentially alter industrial control logic or steal sensitive configuration data.
💻 Affected Systems
- EcoStruxure Control Expert
- EcoStruxure Process Expert
- SCADAPack RemoteConnect for x70
📦 What is this software?
Ecostruxure Control Expert by Schneider Electric
Ecostruxure Control Expert by Schneider Electric
Ecostruxure Process Expert by Schneider Electric
Remoteconnect by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify control logic in critical infrastructure systems, potentially causing physical damage, production shutdowns, or safety incidents by altering protected function blocks.
Likely Case
Unauthorized access to sensitive project files leading to intellectual property theft, configuration tampering, or reconnaissance for further attacks on industrial control systems.
If Mitigated
Limited impact with proper access controls, network segmentation, and project file encryption preventing unauthorized access to vulnerable files.
🎯 Exploit Status
Exploitation requires access to project files, which typically requires some level of system access or file sharing permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V15.0 SP1 for EcoStruxure Control Expert; check vendor advisory for other products
Vendor Advisory: http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-01
Restart Required: Yes
Instructions:
1. Download the appropriate patch from Schneider Electric's security advisory. 2. Backup all project files. 3. Install the patch following vendor instructions. 4. Restart affected systems. 5. Verify patch installation and test functionality.
🔧 Temporary Workarounds
Restrict Project File Access
windowsImplement strict access controls on project files and directories to prevent unauthorized access.
Set appropriate file permissions using Windows ACLs or equivalent
Network Segmentation
allIsolate industrial control systems from business networks and implement strict firewall rules.
🧯 If You Can't Patch
- Implement strict access controls on all project files and directories
- Use encryption for project file storage and transmission
- Monitor for unauthorized access attempts to project files
- Implement application whitelisting to prevent unauthorized software execution
🔍 How to Verify
Check if Vulnerable:
Check software version against affected versions list. For Control Expert: versions prior to V15.0 SP1 are vulnerable.Check Version:
Check version in software 'About' dialog or installation directory propertiesVerify Fix Applied:
Verify installed version is V15.0 SP1 or later for Control Expert. Check vendor advisory for other product updates.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to project files
- Unexpected modifications to .pro or project files
- Failed authentication attempts to engineering workstations
Network Indicators:
- Unexpected file transfers of project files
- Unauthorized access to engineering network segments
SIEM Query:
EventID:4625 OR (FileAccess AND Extension:'.pro') OR (ProcessCreation AND ParentImage:'*ControlExpert*')