CVE-2025-68273
📋 TL;DR
Signal K Server versions before 2.19.0 have an unauthenticated information disclosure vulnerability that allows any user to retrieve sensitive system information including the full data schema, connected serial devices, and installed analyzer tools. This affects boat owners and operators using Signal K Server as their central marine data hub. The exposed information facilitates reconnaissance for potential follow-up attacks.
💻 Affected Systems
- Signal K Server
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain detailed knowledge of the vessel's systems, connected devices, and data structure, enabling targeted attacks that could compromise navigation systems, engine controls, or safety equipment.
Likely Case
Unauthorized users map the vessel's digital infrastructure, identify vulnerable components, and plan subsequent attacks based on the exposed system architecture.
If Mitigated
Limited exposure of non-critical information with no direct system compromise, though some reconnaissance data may still be available to attackers.
🎯 Exploit Status
The vulnerability requires no authentication and minimal technical skill to exploit. Attackers can simply query the vulnerable endpoint to retrieve sensitive information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.19.0
Vendor Advisory: https://github.com/SignalK/signalk-server/security/advisories/GHSA-fpf5-w967-rr2m
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Stop the Signal K Server service. 3. Update to version 2.19.0 using your package manager or manual installation. 4. Restart the Signal K Server service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to Signal K Server to only trusted networks and devices
iptables -A INPUT -p tcp --dport 3000 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP
Reverse Proxy with Authentication
allPlace Signal K Server behind a reverse proxy that requires authentication
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Signal K Server from untrusted networks
- Deploy a web application firewall (WAF) or reverse proxy with authentication in front of Signal K Server
🔍 How to Verify
Check if Vulnerable:
Check if unauthenticated requests to Signal K Server endpoints return sensitive system information that should be protectedCheck Version:
signalk-server --versionVerify Fix Applied:
After updating to 2.19.0, verify that unauthenticated requests no longer return sensitive system information📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to system information endpoints
- Multiple failed authentication attempts followed by information requests
Network Indicators:
- Unusual traffic to Signal K Server from external IP addresses
- Repeated requests to system information endpoints
SIEM Query:
source="signalk-server" AND (uri_path="/signalk/v1/api/" OR uri_path CONTAINS "/system/") AND http_status=200 AND user="anonymous"