CVE-2024-22768
📋 TL;DR
This vulnerability in Hitron Systems DVR HVR-4781 allows attackers to perform network attacks when the device uses default admin credentials. The improper input validation enables unauthorized access to the DVR system. Organizations using affected Hitron DVR devices with default credentials are at risk.
💻 Affected Systems
- Hitron Systems DVR HVR-4781
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the DVR system, allowing attackers to view/manipulate surveillance footage, disable security monitoring, or use the device as a foothold into the network.
Likely Case
Unauthorized access to the DVR system enabling surveillance footage viewing, configuration changes, or disabling of security monitoring.
If Mitigated
Limited impact if strong authentication is implemented and network segmentation is in place.
🎯 Exploit Status
Exploitation requires knowledge of default credentials, which are often publicly available for DVR systems.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.02
Vendor Advisory: http://www.hitron.co.kr/firmware/
Restart Required: Yes
Instructions:
1. Visit http://www.hitron.co.kr/firmware/ 2. Download latest firmware for HVR-4781 3. Upload firmware via DVR web interface 4. Reboot device after installation
🔧 Temporary Workarounds
Change Default Credentials
allImmediately change the default admin username and password to strong, unique credentials
Login to DVR web interface > System Settings > User Management > Change admin password
Network Segmentation
allIsolate DVR system on separate VLAN with restricted access
🧯 If You Can't Patch
- Change all default credentials immediately and implement strong password policies
- Implement network segmentation and firewall rules to restrict DVR access to authorized IPs only
🔍 How to Verify
Check if Vulnerable:
Check if DVR is using default admin credentials by attempting login with known defaultsCheck Version:
Login to DVR web interface > System Information > Firmware VersionVerify Fix Applied:
Verify firmware version is above 4.02 and default credentials no longer work📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login
- Configuration changes from unknown IPs
- Unusual access patterns to DVR interface
Network Indicators:
- External IPs accessing DVR web interface
- Traffic to DVR on non-standard ports
- Brute force attempts against DVR login
SIEM Query:
source_ip=external AND destination_port=(80,443,8080) AND user_agent contains "DVR" AND event_type="authentication_success"