CVE-2022-34753
📋 TL;DR
This CVE describes an OS command injection vulnerability in Schneider Electric's SpaceLogic C-Bus Home Controller (formerly C-Bus Wiser Homer Controller MK2). Attackers can execute arbitrary commands with root privileges remotely, potentially taking full control of affected devices. Organizations using these home automation controllers with vulnerable firmware are at risk.
💻 Affected Systems
- SpaceLogic C-Bus Home Controller (5200WHC2)
- C-Bus Wiser Homer Controller MK2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full root access to the controller, enabling complete device compromise, data theft, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Remote code execution leading to device takeover, disruption of home automation systems, and potential access to connected IoT devices.
If Mitigated
Limited impact if devices are behind firewalls with strict network segmentation and access controls.
🎯 Exploit Status
Public exploit details available on Packet Storm Security. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V1.31.460+ (specific fixed version in vendor advisory)
Restart Required: Yes
Instructions:
1. Download firmware update from Schneider Electric portal. 2. Follow vendor's firmware update procedure for C-Bus Home Controller. 3. Reboot device after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate C-Bus controllers from internet and untrusted networks
Firewall Rules
linuxRestrict network access to controller management interfaces
iptables -A INPUT -p tcp --dport [controller_port] -s [trusted_ips] -j ACCEPT
iptables -A INPUT -p tcp --dport [controller_port] -j DROP
🧯 If You Can't Patch
- Immediately isolate affected devices from internet and untrusted networks
- Implement strict network access controls and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check firmware version via controller web interface or SSH if enabled. Compare against vulnerable versions.Check Version:
ssh admin@[controller_ip] 'cat /etc/version' or check web interfaceVerify Fix Applied:
Verify firmware version is updated beyond V1.31.460 via controller interface.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Unexpected process creation
- Authentication attempts from unknown sources
Network Indicators:
- Unexpected outbound connections from controller
- Suspicious payloads in HTTP requests to controller
SIEM Query:
source="controller_logs" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")🔗 References
- http://packetstormsecurity.com/files/167783/Schneider-Electric-SpaceLogic-C-Bus-Home-Controller-5200WHC2-Remote-Root.html
- https://download.schneider-electric.com/files?p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2022-193-02_SpaceLogic-C-Bus-Home-Controller-Wiser_MK2_Security_Notification.pdf
- http://packetstormsecurity.com/files/167783/Schneider-Electric-SpaceLogic-C-Bus-Home-Controller-5200WHC2-Remote-Root.html
- https://download.schneider-electric.com/files?p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2022-193-02_SpaceLogic-C-Bus-Home-Controller-Wiser_MK2_Security_Notification.pdf
