CVE-2021-22827
📋 TL;DR
This vulnerability allows remote code execution through improper input validation in Schneider Electric's EcoStruxure Power Monitoring Expert software. Attackers can execute arbitrary code by tricking users into visiting a malicious webpage containing injected payloads. Organizations using version 9.0 or earlier of this industrial power monitoring software are affected.
💻 Affected Systems
- EcoStruxure Power Monitoring Expert
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Power Monitoring Expert system leading to industrial control system disruption, data theft, or lateral movement into operational technology networks.
Likely Case
Attacker gains control of the monitoring system to manipulate power data, disrupt monitoring capabilities, or use as foothold for further attacks.
If Mitigated
Limited impact with proper network segmentation and user awareness preventing malicious page access.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious page) but no authentication to the target system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 9.1 or later
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-348-03
Restart Required: Yes
Instructions:
1. Download the update from Schneider Electric's website. 2. Backup current configuration. 3. Install the update following vendor instructions. 4. Restart the system. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Power Monitoring Expert systems from untrusted networks and user workstations.
User Awareness
allTrain users not to visit untrusted websites while using the monitoring system.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the system from internet and user workstations
- Deploy web application firewall rules to block malicious payload patterns
🔍 How to Verify
Check if Vulnerable:
Check software version in Help > About menu. If version is 9.0 or earlier, system is vulnerable.Check Version:
Check via GUI: Help > About in Power Monitoring Expert applicationVerify Fix Applied:
Verify version is 9.1 or later in Help > About menu and test monitoring functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from web browser context
- Unexpected network connections from monitoring system
Network Indicators:
- HTTP requests containing suspicious payload patterns to monitoring system
SIEM Query:
source="PowerMonitoringExpert" AND (process="cmd.exe" OR process="powershell.exe")