CVE-2024-21878
📋 TL;DR
This CVE describes a command injection vulnerability in Enphase IQ Gateway (formerly Envoy) devices that allows attackers to execute arbitrary operating system commands. The vulnerability exists in an internal script and affects Envoy devices from version 4.x through 8.x. This is a critical vulnerability with a CVSS score of 9.8, indicating it's easily exploitable and can lead to complete system compromise.
💻 Affected Systems
- Enphase IQ Gateway
- Enphase Envoy
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Envoy device, allowing attackers to execute arbitrary commands with root privileges, potentially leading to data theft, device takeover, or lateral movement to other network systems.
Likely Case
Attackers gain remote code execution on the Envoy device, allowing them to modify settings, steal energy data, or use the device as a foothold for further network attacks.
If Mitigated
If network segmentation and access controls are properly implemented, the impact may be limited to the Envoy device itself without allowing lateral movement to other critical systems.
🎯 Exploit Status
The vulnerability is in an internal script, suggesting it may be accessible without authentication. The high CVSS score indicates low attack complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://enphase.com/cybersecurity/advisories/ensa-2024-3
Restart Required: No
Instructions:
No official patch is currently available. Monitor the vendor advisory for updates.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Envoy devices from critical network segments and restrict inbound/outbound network access
Access Control Lists
allImplement strict firewall rules to limit access to Envoy devices only from authorized management systems
🧯 If You Can't Patch
- Segment Envoy devices on isolated VLANs with no internet access
- Implement strict egress filtering to prevent compromised devices from communicating with external command and control servers
🔍 How to Verify
Check if Vulnerable:
Check the Envoy firmware version via the web interface or API. If version is between 4.x and 8.x inclusive, the device is vulnerable.Check Version:
curl -s http://[ENVOY_IP]/info | grep versionVerify Fix Applied:
Verify firmware version is updated beyond 8.x when a patch becomes available.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Unexpected process creation
- Suspicious network connections from Envoy device
Network Indicators:
- Unexpected outbound connections from Envoy devices
- Traffic to known malicious IPs from Envoy
- Unusual protocol usage on Envoy management ports
SIEM Query:
source="envoy" AND (process="unusual_command" OR dest_ip="malicious_ip")