CVE-2024-44460
📋 TL;DR
CVE-2024-44460 is an out-of-bounds read vulnerability in Nanomq v0.21.9 that allows attackers to trigger a Denial of Service (DoS) by causing the MQTT broker to crash. This affects all systems running the vulnerable version of Nanomq, particularly IoT and messaging infrastructure deployments.
💻 Affected Systems
- Nanomq
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of the MQTT broker, causing loss of messaging functionality for all connected clients and potential cascading failures in dependent systems.
Likely Case
Service crash requiring manual restart of the Nanomq process, resulting in temporary loss of MQTT messaging capabilities.
If Mitigated
Isolated service restart with minimal impact if proper monitoring and automated recovery are in place.
🎯 Exploit Status
The GitHub reference contains proof-of-concept code demonstrating the crash. Exploitation requires sending specially crafted MQTT packets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v0.21.10 or later
Vendor Advisory: https://github.com/emqx/nanomq/releases
Restart Required: Yes
Instructions:
1. Stop the Nanomq service. 2. Update to v0.21.10 or later using your package manager or from GitHub releases. 3. Restart the Nanomq service.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict access to Nanomq MQTT ports (default 1883/8883) to trusted networks only.
iptables -A INPUT -p tcp --dport 1883 -s TRUSTED_NETWORK -j ACCEPT
iptables -A INPUT -p tcp --dport 1883 -j DROP
Rate Limiting
linuxImplement network-level rate limiting to reduce attack surface.
iptables -A INPUT -p tcp --dport 1883 -m limit --limit 10/min --limit-burst 20 -j ACCEPT
🧯 If You Can't Patch
- Implement strict network access controls to limit who can connect to the MQTT broker
- Deploy Nanomq behind a reverse proxy with request filtering capabilities
🔍 How to Verify
Check if Vulnerable:
Check Nanomq version: nanomq --version. If output shows v0.21.9, system is vulnerable.Check Version:
nanomq --versionVerify Fix Applied:
After update, verify version shows v0.21.10 or later: nanomq --version📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in Nanomq logs
- Unexpected process termination
- High frequency of connection attempts
Network Indicators:
- Unusual MQTT packet patterns
- Multiple connection attempts from single sources
- Traffic spikes on MQTT ports
SIEM Query:
source="nanomq.log" AND ("segmentation fault" OR "crash" OR "SIGSEGV")