CVE-2020-25747
📋 TL;DR
This vulnerability allows remote attackers to bypass authentication on Rubetek security cameras' Telnet service, gaining unauthorized access to RTSP and ONFIV services. Attackers can watch live camera feeds, manipulate camera functions, change settings, and restart or factory reset devices. Organizations using affected Rubetek RV-3406, RV-3409, or RV-3411 cameras with vulnerable firmware are at risk.
💻 Affected Systems
- Rubetek RV-3406
- Rubetek RV-3409
- Rubetek RV-3411
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of camera systems allowing unauthorized surveillance, camera manipulation, and potential physical security breaches if cameras monitor sensitive areas.
Likely Case
Unauthorized access to live camera feeds, camera manipulation (rotation, settings changes), and service disruption through restarts.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external access to camera management interfaces.
🎯 Exploit Status
Public exploit code available on GitHub. Exploitation requires only network access to Telnet port (typically 23) with no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check Rubetek website for firmware updates. If unavailable, implement workarounds.
🔧 Temporary Workarounds
Disable Telnet Service
allDisable Telnet service on affected cameras to prevent exploitation.
Access camera web interface → Network settings → Disable Telnet service
Network Segmentation
allIsolate cameras on separate VLAN with strict firewall rules blocking external access to management ports.
Configure firewall to block inbound traffic to port 23 (Telnet) from untrusted networks
🧯 If You Can't Patch
- Implement strict network access controls to prevent external access to camera management interfaces
- Monitor network traffic for unauthorized access attempts to camera Telnet ports
🔍 How to Verify
Check if Vulnerable:
Attempt Telnet connection to camera port 23. If connection succeeds without authentication and provides access to RTSP/ONFIV services, device is vulnerable.Check Version:
Check camera web interface → System Information → Firmware VersionVerify Fix Applied:
Verify Telnet service is disabled or requires authentication. Test that RTSP and ONFIV services cannot be accessed without proper credentials.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts on Telnet
- Successful Telnet connections from unusual IPs
- Camera configuration changes without authorized user activity
Network Indicators:
- Telnet connections to camera port 23 from external IPs
- Unusual RTSP stream requests
- ONFIV protocol traffic from unauthorized sources
SIEM Query:
source="camera_logs" AND (event="telnet_login" OR event="configuration_change") AND user="unknown"