CVE-2024-50694
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on SunGrow WiNet-SV200 devices by exploiting a stack-based buffer overflow when processing MQTT messages. 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
Complete system compromise leading to remote code execution, device takeover, and potential lateral movement within the network.
Likely Case
Remote code execution allowing attackers to manipulate device functionality, steal data, or use the device as a foothold for further attacks.
If Mitigated
Denial of service or limited information disclosure if exploit attempts are detected and blocked.
🎯 Exploit Status
The buffer overflow occurs during timestamp copying from MQTT messages, which is a common attack vector. No authentication is required to send MQTT messages.
🛠️ 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. Download the latest firmware from SunGrow's official website. 2. Follow SunGrow's firmware update procedure for WiNet-SV200 devices. 3. Restart the device after patching.
🔧 Temporary Workarounds
Network Segmentation
allIsolate WiNet-SV200 devices from untrusted networks and restrict MQTT traffic.
MQTT Broker Access Control
allImplement strict authentication and authorization for MQTT brokers that communicate with affected devices.
🧯 If You Can't Patch
- Implement network-level filtering to block or inspect MQTT traffic to vulnerable devices
- Deploy intrusion detection systems to monitor for buffer overflow attempts in MQTT communications
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is .001.00.P027 or earlier, the device is vulnerable.Check Version:
Check via device web interface at System > Firmware Information or use manufacturer-specific CLI commandsVerify Fix Applied:
Verify firmware version is newer than .001.00.P027 and test MQTT functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Unusual MQTT message patterns
- Device crash/restart logs
- Buffer overflow error messages in system logs
Network Indicators:
- Abnormal MQTT traffic patterns
- Large or malformed MQTT timestamp fields
- Unexpected connections to MQTT ports
SIEM Query:
source="*WiNet-SV200*" AND (event="buffer_overflow" OR event="crash" OR mqtt.message_size>threshold)