CVE-2023-26866
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to execute arbitrary commands with root privileges on GreenPacket OH736 WR-1200 Indoor Unit and OT-235 devices. Attackers can completely compromise affected devices before any authentication occurs. Organizations using these specific firmware versions are at risk.
💻 Affected Systems
- GreenPacket OH736 WR-1200 Indoor Unit
- GreenPacket OT-235
📦 What is this software?
Ot 235 Firmware by Greenpacket
Ot 235 Firmware by Greenpacket
Wr 1200 Firmware by Greenpacket
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing attackers to install persistent backdoors, pivot to internal networks, intercept/modify network traffic, or use devices as botnet nodes.
Likely Case
Remote code execution leading to device compromise, data exfiltration, and potential lateral movement within the network.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public proof-of-concept code available on GitHub demonstrates remote command injection without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Check vendor website for firmware updates and apply if available.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate network segments with strict firewall rules.
Access Control Lists
allImplement strict inbound filtering to limit access to device management interfaces.
🧯 If You Can't Patch
- Immediately remove affected devices from internet-facing positions
- Implement network monitoring for unusual outbound connections from these devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or SSH if accessible. Compare against affected versions.Check Version:
Check via device web interface or manufacturer-specific CLI commandsVerify Fix Applied:
Verify firmware has been updated to a version not listed in affected versions.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful command execution
- Suspicious process creation
Network Indicators:
- Unusual outbound connections from device
- Traffic to known malicious IPs
- Unexpected SSH or reverse shell connections
SIEM Query:
Example: 'source="device_logs" AND ("command injection" OR "unauthorized command" OR suspicious shell commands)'