CVE-2023-53739
📋 TL;DR
CVE-2023-53739 allows unauthenticated remote attackers to download configuration backup files from Tinycontrol LAN Controller v3 LK3 devices, exposing base64-encoded administrative credentials. This affects organizations using the vulnerable controller version for network management. Attackers can gain administrative access to the controller without authentication.
💻 Affected Systems
- Tinycontrol LAN Controller v3 LK3
⚠️ 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
Attackers gain administrative control of the LAN controller, potentially compromising the entire network infrastructure, deploying malware, or disrupting operations.
Likely Case
Attackers extract credentials, gain administrative access to the controller, and modify network configurations or access connected systems.
If Mitigated
With proper network segmentation and access controls, impact is limited to the controller itself without lateral movement.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB (ID 51731). Attack requires only HTTP access to the controller.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tinycontrol.pl
Restart Required: No
Instructions:
No official patch available. Check vendor website for updates. Consider upgrading to newer hardware versions if available.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the LAN controller from untrusted networks and internet access
Access Control Lists
allImplement firewall rules to restrict access to the controller's management interface
🧯 If You Can't Patch
- Remove the controller from internet-facing networks immediately
- Monitor for unauthorized access attempts and configuration changes
🔍 How to Verify
Check if Vulnerable:
Attempt to access http://[controller-ip]/lk3_settings.bin without authentication. If file downloads, system is vulnerable.Check Version:
Check controller web interface or documentation for version informationVerify Fix Applied:
Verify the lk3_settings.bin file is no longer accessible without authentication.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to lk3_settings.bin file
- Multiple failed authentication attempts followed by configuration file access
Network Indicators:
- HTTP GET requests to /lk3_settings.bin from unauthorized IPs
- Unusual outbound connections from controller after compromise
SIEM Query:
source_ip=* dest_ip=[controller_ip] uri_path="/lk3_settings.bin" AND http_method=GET