CVE-2024-6352
📋 TL;DR
A buffer overflow vulnerability in the APS layer of the Ember ZNet stack allows an attacker to cause an assert (crash) by sending a malformed packet. This affects IoT devices and systems using Silicon Labs' Ember ZNet protocol stack for Zigbee communication. The vulnerability could lead to denial of service or potentially remote code execution in certain configurations.
💻 Affected Systems
- Silicon Labs Ember ZNet stack
- Devices using Silicon Labs Zigbee chipsets
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise and lateral movement within Zigbee networks
Likely Case
Denial of service causing device crashes and network disruption
If Mitigated
Limited impact with proper network segmentation and monitoring
🎯 Exploit Status
Exploitation requires sending malformed Zigbee packets to vulnerable devices
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest Simplicity SDK releases
Vendor Advisory: https://community.silabs.com/069Vm00000HtvDgIAJ
Restart Required: Yes
Instructions:
1. Check affected device firmware version
2. Update to latest Simplicity SDK version
3. Recompile and flash updated firmware
4. Verify APS layer functionality
🔧 Temporary Workarounds
Network Segmentation
allIsolate Zigbee networks from untrusted networks
Packet Filtering
allImplement network monitoring to detect malformed Zigbee packets
🧯 If You Can't Patch
- Implement strict network segmentation for Zigbee devices
- Monitor for abnormal network traffic and device crashes
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisoryCheck Version:
Device-specific; consult manufacturer documentationVerify Fix Applied:
Verify updated firmware version and test with malformed packet simulation📡 Detection & Monitoring
Log Indicators:
- Device crash logs
- APS layer assert errors
- Unexpected device reboots
Network Indicators:
- Malformed Zigbee packets
- Abnormal APS layer traffic patterns
SIEM Query:
search 'assert' OR 'crash' AND 'Zigbee' OR 'Ember ZNet' in device logs