CVE-2024-45038
📋 TL;DR
This CVE describes a denial-of-service vulnerability in Meshtastic device firmware's MQTT handling. Attackers can crash devices by sending malicious MQTT messages, disrupting mesh network communications. All Meshtastic users are affected, particularly those connecting to private MQTT servers.
💻 Affected Systems
- Meshtastic device firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of mesh network communications, rendering all affected devices unresponsive and requiring physical reset or reflashing.
Likely Case
Targeted devices become unresponsive and drop from the mesh network, requiring manual intervention to restore functionality.
If Mitigated
No impact if devices are updated to patched firmware version before exploitation attempts occur.
🎯 Exploit Status
Exploitation requires sending specially crafted MQTT messages to vulnerable devices, which can be done by anyone with network access to the device or MQTT broker.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.1
Vendor Advisory: https://github.com/meshtastic/firmware/security/advisories/GHSA-3x3r-vw9f-pxq5
Restart Required: Yes
Instructions:
1. Download Meshtastic firmware version 2.4.1 or later from official sources. 2. Flash the firmware to all Meshtastic devices using appropriate flashing tools. 3. Verify successful update and device functionality.
🧯 If You Can't Patch
- Disable MQTT functionality on all devices if not required for operations
- Isolate Meshtastic devices on separate network segments with strict firewall rules limiting MQTT traffic
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via Meshtastic app or web interface. If version is below 2.4.1, device is vulnerable.Check Version:
Use Meshtastic app or web interface to view device information and firmware version.Verify Fix Applied:
Confirm device firmware version is 2.4.1 or higher via Meshtastic interface and verify MQTT connectivity remains stable.📡 Detection & Monitoring
Log Indicators:
- Device crash logs
- Unexpected device reboots
- MQTT connection failures
Network Indicators:
- Unusual MQTT traffic patterns to Meshtastic devices
- Devices dropping from network unexpectedly
SIEM Query:
Search for MQTT protocol anomalies or device disconnection events from Meshtastic devices