CVE-2024-50697
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on SunGrow WiNet-SV200 devices by exploiting a stack-based buffer overflow during MQTT message decryption. Attackers can potentially take full control of affected devices. All users of SunGrow WiNet-SV200.001.00.P027 and earlier versions are affected.
💻 Affected Systems
- SunGrow WiNet-SV200
📦 What is this software?
Winet S Firmware by Sungrowpower
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, and potential lateral movement within the network
Likely Case
Device crash/denial of service, with potential for remote code execution by skilled attackers
If Mitigated
Limited to denial of service if proper network segmentation and access controls are implemented
🎯 Exploit Status
Exploitation requires crafting malicious MQTT messages with specific TLV fields to trigger the buffer overflow
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after WiNet-SV200.001.00.P027
Vendor Advisory: https://en.sungrowpower.com/security-notice-detail-2/5961
Restart Required: Yes
Instructions:
1. Contact SunGrow support for latest firmware 2. Download updated firmware from vendor portal 3. Apply firmware update following vendor instructions 4. Reboot device to activate new firmware
🔧 Temporary Workarounds
Network Segmentation
allIsolate WiNet-SV200 devices in separate VLANs with strict firewall rules
MQTT Access Control
allImplement strict MQTT broker authentication and restrict access to trusted IPs only
🧯 If You Can't Patch
- Implement network-level IPS/IDS rules to detect and block malicious MQTT traffic patterns
- Deploy devices behind VPNs with strict access controls and monitor for anomalous MQTT activity
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or SSH: version should be WiNet-SV200.001.00.P027 or earlierCheck Version:
ssh admin@device_ip 'cat /etc/version' or check web interface System Information pageVerify Fix Applied:
Verify firmware version is newer than WiNet-SV200.001.00.P027 and test MQTT message handling with fuzzing tools📡 Detection & Monitoring
Log Indicators:
- Device crash logs
- Memory access violation errors
- Unusual MQTT connection attempts
Network Indicators:
- Malformed MQTT packets with unusual TLV structures
- Traffic spikes to MQTT port 1883/8883
SIEM Query:
source="sungrow-device" AND (event_type="crash" OR message="*buffer overflow*" OR protocol="mqtt" AND packet_size>threshold)