CVE-2024-50698
📋 TL;DR
A heap-based buffer overflow vulnerability in SunGrow WiNet-SV200 MQTT message processing allows attackers to execute arbitrary code or cause denial of service. This affects all users of SunGrow WiNet-SV200 versions 001.00.P027 and earlier. The vulnerability is remotely exploitable without authentication.
💻 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 system compromise, data theft, or device takeover
Likely Case
Denial of service causing device malfunction or system crashes
If Mitigated
Limited impact if network segmentation and strict access controls prevent external access
🎯 Exploit Status
The vulnerability is in MQTT message bounds checking, making exploitation straightforward for skilled attackers
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 001.00.P027
Vendor Advisory: https://en.sungrowpower.com/security-notice-detail-2/5961
Restart Required: Yes
Instructions:
1. Contact SunGrow support for updated firmware. 2. Download the latest firmware version. 3. Apply firmware update following vendor instructions. 4. Reboot the device.
🔧 Temporary Workarounds
Network Segmentation
allIsolate WiNet-SV200 devices from untrusted networks and restrict MQTT traffic
Firewall Rules
linuxBlock external access to MQTT port (typically 1883/8883)
iptables -A INPUT -p tcp --dport 1883 -j DROP
iptables -A INPUT -p tcp --dport 8883 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable devices
- Deploy intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is 001.00.P027 or earlier, device is vulnerable.Check Version:
Check via device web interface or contact SunGrow for specific CLI commandsVerify Fix Applied:
Verify firmware version is newer than 001.00.P027 and test MQTT connectivity remains functional📡 Detection & Monitoring
Log Indicators:
- Unusual MQTT connection attempts
- Device crash/restart logs
- Memory allocation errors
Network Indicators:
- Malformed MQTT packets to port 1883/8883
- Unusual traffic patterns to WiNet-SV200 devices
SIEM Query:
source="*WiNet-SV200*" AND (event="crash" OR event="restart" OR protocol="MQTT" AND size>normal)