CVE-2015-4464
📋 TL;DR
CVE-2015-4464 is a critical authentication bypass vulnerability in Kguard Digital Video Recorder systems where the ActiveX client communicates with the application server without any authorization or authentication. This allows attackers to directly access and control the DVR system remotely. Organizations using affected Kguard DVR models for security surveillance are impacted.
💻 Affected Systems
- Kguard Digital Video Recorder
📦 What is this software?
Kg Sha104 Firmware by Kguardsecurity
Kg Sha108 Firmware by Kguardsecurity
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the DVR system allowing unauthorized access to live video feeds, recorded footage, system configuration, and potential use as an entry point into the broader network.
Likely Case
Unauthorized viewing of surveillance footage, manipulation of recording schedules, deletion of evidence, and potential privacy violations.
If Mitigated
Limited to no impact if proper network segmentation and access controls prevent external or unauthorized internal access to the DVR system.
🎯 Exploit Status
The vulnerability is straightforward to exploit as it requires no authentication. Public proof-of-concept details and exploit code are available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: No official vendor advisory found in provided references
Restart Required: No
Instructions:
No official patch available. Check with Kguard vendor for potential firmware updates or security advisories.
🔧 Temporary Workarounds
Network Segmentation and Access Control
allIsolate DVR systems on separate network segments with strict firewall rules to prevent unauthorized access.
Disable or Block ActiveX Communication
linuxBlock network traffic to/from the DVR's ActiveX communication ports (typically 80, 8080, or custom ports).
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 8080 -j DROP
🧯 If You Can't Patch
- Remove affected DVR systems from internet-facing networks immediately
- Implement strict network access controls allowing only authorized management systems to communicate with DVRs
🔍 How to Verify
Check if Vulnerable:
Check if Kguard DVR models 104, 108, or v2 are deployed and accessible via ActiveX client without authentication.Check Version:
Check DVR system information through web interface or console (typically accessible via browser at DVR IP address)Verify Fix Applied:
Verify that authentication is required for ActiveX client communication or that the vulnerable interface is no longer accessible.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to DVR web/ActiveX interfaces
- Unexpected configuration changes to DVR settings
Network Indicators:
- Unusual traffic patterns to DVR ports from unauthorized IP addresses
- ActiveX protocol traffic without authentication
SIEM Query:
source_ip NOT IN (authorized_ips) AND dest_port IN (80, 8080, [DVR_ports]) AND protocol="tcp"🔗 References
- http://packetstormsecurity.com/files/132437/Kguard-Digital-Video-Recorder-Bypass-Issues.html
- http://www.securityfocus.com/archive/1/535822/100/0/threaded
- http://www.securityfocus.com/bid/73032
- https://www.academia.edu/11677554/Kguard_Digital_Video_Recorders_Multiple_Vulnerabilities
- http://packetstormsecurity.com/files/132437/Kguard-Digital-Video-Recorder-Bypass-Issues.html
- http://www.securityfocus.com/archive/1/535822/100/0/threaded
- http://www.securityfocus.com/bid/73032
- https://www.academia.edu/11677554/Kguard_Digital_Video_Recorders_Multiple_Vulnerabilities
