CVE-2024-42646
📋 TL;DR
A segmentation fault vulnerability in NanoMQ v0.21.10 allows attackers to cause Denial of Service (DoS) by sending specially crafted messages. This affects systems running vulnerable versions of NanoMQ MQTT broker, potentially disrupting IoT and messaging services.
💻 Affected Systems
- NanoMQ
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service outage of NanoMQ broker, disrupting all MQTT communications and dependent IoT/messaging applications until service restart.
Likely Case
Service crash requiring manual restart, causing temporary disruption to MQTT message processing and client connections.
If Mitigated
Minimal impact with proper network segmentation and monitoring allowing quick detection and recovery.
🎯 Exploit Status
Crafted MQTT messages can trigger segmentation fault without authentication. Proof-of-concept details available in public bug report.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v0.21.11 or later
Vendor Advisory: https://github.com/nanomq/nanomq
Restart Required: Yes
Instructions:
1. Check current version with 'nanomq --version'. 2. Update to v0.21.11+ via package manager or source compilation. 3. Restart NanoMQ service.
🔧 Temporary Workarounds
Network Filtering
allImplement network-level filtering to block suspicious MQTT traffic patterns
Rate Limiting
allApply rate limiting to MQTT connections to reduce attack surface
🧯 If You Can't Patch
- Isolate NanoMQ instances behind firewalls with strict ingress filtering
- Implement automated monitoring and alerting for service crashes with auto-restart capabilities
🔍 How to Verify
Check if Vulnerable:
Check if running NanoMQ v0.21.10 with 'nanomq --version' or equivalent package manager commandCheck Version:
nanomq --versionVerify Fix Applied:
Confirm version is v0.21.11 or later and test with normal MQTT traffic📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors
- Unexpected NanoMQ process termination
- Core dump files
Network Indicators:
- Unusual MQTT message patterns
- Rapid connection attempts with malformed packets
SIEM Query:
process_name="nanomq" AND (event_type="crash" OR error_message="segmentation fault")