CVE-2022-34759
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in Schneider Electric's X80 advanced RTU and OPC UA Modicon communication modules. Improper parsing of HTTP headers could allow attackers to cause denial of service of the webserver. Organizations using affected Schneider Electric industrial control system components are at risk.
💻 Affected Systems
- X80 advanced RTU Communication Module (BMENOR2200H)
- OPC UA Modicon Communication Module (BMENUA0100)
📦 What is this software?
Opc Ua Module For M580 Firmware by Schneider Electric
X80 Advanced Rtu Module Firmware by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service of the webserver component, potentially disrupting industrial control system communications and operations.
Likely Case
Webserver crash leading to temporary loss of web interface functionality until manual restart.
If Mitigated
Minimal impact if systems are behind proper network segmentation and have restricted HTTP access.
🎯 Exploit Status
The vulnerability requires sending specially crafted HTTP headers to the webserver interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Schneider Electric security advisory for specific patched versions
Restart Required: Yes
Instructions:
1. Download firmware update from Schneider Electric portal. 2. Follow vendor's firmware update procedure for affected modules. 3. Restart devices after update.
🔧 Temporary Workarounds
Network segmentation
allIsolate affected devices in dedicated network segments with restricted HTTP access
Access control lists
allImplement firewall rules to restrict HTTP access to trusted sources only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices
- Disable web interface if not required for operations
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against affected versions listed in vendor advisoryCheck Version:
Check via device web interface or Schneider Electric configuration toolsVerify Fix Applied:
Verify firmware version has been updated to patched version from Schneider Electric📡 Detection & Monitoring
Log Indicators:
- Webserver crash logs
- Unusual HTTP header patterns in access logs
Network Indicators:
- Malformed HTTP requests to device web interfaces
- Sudden loss of web service
SIEM Query:
source="industrial_device" AND (http_request contains "malformed_header" OR status="crash")🔗 References
- https://download.schneider-electric.com/files?p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2022-193-01_OPC_UA_X80_Advanced_RTU_Modicon_Communication_Modules+_Security_Notification.pdf
- https://download.schneider-electric.com/files?p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2022-193-01_OPC_UA_X80_Advanced_RTU_Modicon_Communication_Modules+_Security_Notification.pdf
