CVE-2024-21880
📋 TL;DR
This CVE describes a command injection vulnerability in Enphase IQ Gateway devices (formerly Envoy) where authenticated attackers can execute arbitrary operating system commands via the 'url' parameter. The vulnerability affects Envoy firmware versions 4.x through 7.x, potentially compromising gateway devices used in solar energy systems.
💻 Affected Systems
- Enphase IQ Gateway
- Enphase Envoy
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attackers to execute arbitrary commands with gateway privileges, potentially gaining persistent access, stealing energy data, or using the device as a pivot point into internal networks.
Likely Case
Attackers with authenticated access can execute limited commands to disrupt gateway functionality, modify energy monitoring data, or establish footholds for further attacks.
If Mitigated
With proper network segmentation and authentication controls, impact is limited to the gateway device itself without lateral movement to other systems.
🎯 Exploit Status
Exploitation requires authenticated access but command injection is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.x or later
Vendor Advisory: https://enphase.com/cybersecurity/advisories/ensa-2024-5
Restart Required: Yes
Instructions:
1. Log into Enphase Installer Toolkit
2. Check current firmware version
3. If below version 8.x, initiate firmware update
4. Wait for update to complete and device to restart
5. Verify new firmware version is 8.x or higher
🔧 Temporary Workarounds
Network Segmentation
allIsolate Enphase gateways from internet and restrict access to management interfaces
Authentication Hardening
allImplement strong authentication controls and limit access to management interfaces
🧯 If You Can't Patch
- Segment gateway devices on isolated VLANs with strict firewall rules
- Implement network monitoring for unusual outbound connections from gateway devices
🔍 How to Verify
Check if Vulnerable:
Check firmware version via Enphase Installer Toolkit or web interface. If version is between 4.x and 7.x inclusive, device is vulnerable.Check Version:
Check via Enphase Installer Toolkit or web interface at http://[gateway-ip]/infoVerify Fix Applied:
Confirm firmware version is 8.x or higher via Enphase Installer Toolkit or device web interface.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from gateway device
- Traffic to unexpected ports from gateway
SIEM Query:
source="enphase-gateway" AND (event_type="command_execution" OR auth_success AFTER multiple auth_failures)