CVE-2024-50692
📋 TL;DR
This vulnerability in SunGrow WiNet-S inverters allows attackers to send arbitrary commands to inverters using hardcoded MQTT credentials and intercept communications due to missing TLS authentication. It affects all SunGrow WiNet-SV200.001.00.P027 and earlier versions, potentially impacting industrial energy systems.
💻 Affected Systems
- SunGrow WiNet-SV200
📦 What is this software?
Winet S Firmware by Sungrowpower
Winet S Firmware by Sungrowpower
⚠️ Risk & Real-World Impact
Worst Case
Attackers could manipulate inverter operations, cause equipment damage, disrupt power generation, or create safety hazards in industrial environments.
Likely Case
Unauthorized monitoring of energy data, manipulation of inverter settings, or disruption of normal operations through command injection.
If Mitigated
Limited to network reconnaissance or unsuccessful exploitation attempts if proper network segmentation and monitoring are in place.
🎯 Exploit Status
Exploitation requires network access to MQTT broker. Tools like mqtt-pwn can be used for exploitation. No authentication needed due to hardcoded credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after SV200.001.00.P027
Vendor Advisory: https://en.sungrowpower.com/security-notice-detail-2/5961
Restart Required: Yes
Instructions:
1. Contact SunGrow support for firmware update. 2. Download latest firmware version. 3. Apply firmware update through management interface. 4. Restart inverter system. 5. Verify MQTT configuration uses TLS and unique credentials.
🔧 Temporary Workarounds
Network Segmentation
allIsolate inverter network from untrusted networks using firewalls
MQTT Broker Hardening
linuxConfigure MQTT broker to require TLS and unique credentials
mosquitto_passwd -c /etc/mosquitto/passwd inverter_user
echo 'listener 8883' >> /etc/mosquitto/mosquitto.conf
echo 'require_certificate true' >> /etc/mosquitto/mosquitto.conf
🧯 If You Can't Patch
- Implement strict network segmentation - isolate inverter systems in separate VLAN with firewall rules blocking external MQTT access
- Deploy network monitoring and IDS/IPS to detect MQTT protocol anomalies and unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in management interface. If version is SV200.001.00.P027 or earlier, system is vulnerable. Also test MQTT connection without TLS using default credentials.Check Version:
Check inverter management interface or use manufacturer's diagnostic toolsVerify Fix Applied:
Verify firmware version is newer than SV200.001.00.P027. Test that MQTT connections require TLS and reject connections with default credentials.📡 Detection & Monitoring
Log Indicators:
- MQTT connection attempts without TLS
- Authentication failures with default credentials
- Unusual command patterns to inverter topics
Network Indicators:
- MQTT traffic on port 1883 (non-TLS)
- MQTT PUBLISH commands to inverter control topics from unauthorized sources
- Man-in-the-middle attacks on MQTT communications
SIEM Query:
source="mqtt.log" AND (event="connection" AND NOT tls="true") OR (event="auth" AND user="default_user")