CVE-2023-24150
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOLINK T8 routers that allows attackers to execute arbitrary commands via crafted MQTT packets. Attackers can exploit the serverIp parameter in the meshSlaveDlfw function to gain remote code execution. This affects TOTOLINK T8 router users with vulnerable firmware versions.
💻 Affected Systems
- TOTOLINK T8
📦 What is this software?
T8 Firmware by Totolink
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, and use the device for botnet activities.
Likely Case
Remote code execution leading to router compromise, credential theft, DNS hijacking, and network surveillance.
If Mitigated
Limited impact if proper network segmentation, firewall rules, and MQTT protocol restrictions are in place.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repositories. Exploitation requires sending crafted MQTT packets to the vulnerable parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates
2. Download latest firmware for T8 model
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable MQTT Service
allDisable MQTT protocol functionality on the router if not required
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Implement strict firewall rules to block MQTT traffic (port 1883/TCP) from untrusted sources
- Monitor network traffic for unusual MQTT packets and command injection attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is V4.1.5cu or earlier, assume vulnerable.Check Version:
Login to router admin interface and check System Status or Firmware Information pageVerify Fix Applied:
Verify firmware version has been updated beyond V4.1.5cu. Test with controlled MQTT packet to confirm command injection is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Unusual MQTT traffic patterns
- Unexpected command execution in router logs
- Failed authentication attempts on MQTT service
Network Indicators:
- MQTT packets with suspicious payloads in serverIp parameter
- Outbound connections from router to unknown IPs
- Unusual port 1883 traffic
SIEM Query:
source="router_logs" AND ("meshSlaveDlfw" OR "serverIp" OR "MQTT") AND ("exec" OR "system" OR "command")