CVE-2023-1083
📋 TL;DR
CVE-2023-1083 allows unauthenticated remote attackers to send and receive MQTT messages on vulnerable systems, enabling them to execute configuration commands, reboot devices, and push firmware updates. This affects IoT devices and systems using vulnerable MQTT implementations. Attackers only need knowledge of the MQTT topic name to exploit this vulnerability.
💻 Affected Systems
- IoT devices with vulnerable MQTT implementations
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover through malicious firmware updates, permanent backdoor installation, or bricking devices via destructive commands.
Likely Case
Unauthorized configuration changes, service disruption through reboot commands, and potential data exfiltration via MQTT messages.
If Mitigated
Limited impact with proper network segmentation and authentication controls preventing unauthorized MQTT access.
🎯 Exploit Status
Exploitation requires only MQTT client tools and topic knowledge. No complex reverse engineering needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor-specific updates
Vendor Advisory: https://cert.vde.com/en/advisories/VDE-2024-009
Restart Required: Yes
Instructions:
1. Check VDE advisory for affected products 2. Contact device vendors for firmware updates 3. Apply vendor-provided patches 4. Restart affected devices
🔧 Temporary Workarounds
Enable MQTT Authentication
linuxConfigure MQTT broker to require username/password authentication
# Configure in mosquitto.conf: allow_anonymous false
# Add: password_file /etc/mosquitto/passwd
Implement Access Control Lists
linuxRestrict MQTT topic access to authorized clients only
# In mosquitto.conf: acl_file /etc/mosquitto/acl
# ACL example: topic readwrite sensors/#
🧯 If You Can't Patch
- Network segmentation: Isolate MQTT devices in separate VLAN with strict firewall rules
- Implement VPN or TLS encryption for MQTT communications
🔍 How to Verify
Check if Vulnerable:
Test if MQTT broker accepts unauthenticated connections: mosquitto_sub -h [target] -t test -vCheck Version:
Check device firmware version via vendor-specific methodsVerify Fix Applied:
Attempt unauthenticated MQTT connection after patch - should be rejected📡 Detection & Monitoring
Log Indicators:
- Unauthenticated MQTT connections
- Unexpected configuration changes
- Reboot commands from unknown sources
Network Indicators:
- MQTT traffic from unexpected IPs
- GET/SET commands to sensitive topics
- Firmware update packets
SIEM Query:
source="mqtt.log" AND (event="unauthenticated" OR event="config_change")