CVE-2024-50928
📋 TL;DR
This vulnerability allows attackers to manipulate wakeup intervals of Z-Wave end devices in controller memory, potentially disrupting communication between devices and controllers. It affects Silicon Labs Z-Wave Series 700 and 800 devices running vulnerable firmware versions. This impacts smart home, industrial, and commercial automation systems using affected Z-Wave controllers.
💻 Affected Systems
- Silicon Labs Z-Wave Series 700 controllers
- Silicon Labs Z-Wave Series 800 controllers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of Z-Wave network communications leading to device unresponsiveness, loss of automation control, and potential safety issues in critical systems like security or environmental controls.
Likely Case
Intermittent communication failures between Z-Wave devices and controllers, causing automation routines to fail and requiring manual intervention to restore functionality.
If Mitigated
Limited impact with proper network segmentation and monitoring, though some communication delays may still occur.
🎯 Exploit Status
Exploitation requires access to the Z-Wave network or controller interface; GitHub reference suggests proof-of-concept exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Silicon Labs security advisories for updated firmware
Vendor Advisory: https://www.silabs.com/security
Restart Required: Yes
Instructions:
1. Check Silicon Labs security advisory for patched firmware version. 2. Download updated firmware from official vendor portal. 3. Follow vendor instructions to flash firmware to affected Z-Wave controllers. 4. Verify all connected devices re-establish proper communication.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Z-Wave controllers from untrusted networks to limit attack surface
Access Control Hardening
allRestrict physical and network access to Z-Wave controller management interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Z-Wave controllers from potential attackers
- Monitor Z-Wave network traffic for anomalous wakeup interval changes and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check controller firmware version against vulnerable version v7.21.1 using vendor management tools or console commandsCheck Version:
Consult vendor documentation for specific version check commands (varies by controller model)Verify Fix Applied:
Verify firmware version is updated beyond v7.21.1 and test wakeup interval functionality with connected devices📡 Detection & Monitoring
Log Indicators:
- Unexpected wakeup interval changes in controller logs
- Failed communication attempts between controllers and end devices
Network Indicators:
- Anomalous Z-Wave protocol traffic patterns
- Unexpected wakeup command transmissions
SIEM Query:
source="zwave_controller" AND (event="wakeup_interval_change" OR event="communication_failure")