CVE-2024-22768: Hitron HVR-4781 Auth Bypass Vulnerability

CVE-2024-22768 Overview

CVE-2024-22768 is an Improper Input Validation vulnerability affecting Hitron Systems DVR HVR-4781 devices running firmware versions 1.03 through 4.02. The vulnerability allows remote attackers to conduct network attacks when the device is configured with default administrator credentials. This combination of hardcoded credentials (CWE-798) and improper input validation (CWE-20) creates a significant attack surface for network-based exploitation.

Critical Impact

Remote attackers can exploit this vulnerability to cause denial of service conditions on affected DVR systems using default credentials, potentially disrupting surveillance and security monitoring capabilities.

Affected Products

• Hitron HVR-4781 Firmware versions 1.03 through 4.02
• Hitron HVR-4781 Hardware Device
• Hitron Systems DVR with default administrative credentials

Discovery Timeline

• 2024-01-23 - CVE-2024-22768 published to NVD
• 2025-12-31 - Last updated in NVD database

Technical Details for CVE-2024-22768

Vulnerability Analysis

This vulnerability stems from insufficient input validation in the Hitron HVR-4781 DVR firmware combined with the presence of default administrative credentials. When attackers leverage the default admin ID and password, they gain access to device functionality that lacks proper input sanitization. The network-accessible attack vector means exploitation can occur remotely without requiring any user interaction, and no privileges beyond the default credentials are needed to initiate an attack.

The vulnerability primarily impacts system availability, allowing attackers to disrupt the normal operation of the DVR system. This is particularly concerning for surveillance infrastructure where continuous recording and monitoring are critical security requirements.

Root Cause

The root cause involves two interrelated weaknesses:

1. Hardcoded Credentials (CWE-798): The DVR ships with default administrator credentials that many users fail to change, providing attackers with a known authentication bypass.

2. Improper Input Validation (CWE-20): Once authenticated with default credentials, the system fails to properly validate input data, enabling attackers to submit malformed or malicious input that triggers network attack conditions.

The combination of these weaknesses significantly lowers the barrier to exploitation, as attackers can easily discover devices running default configurations through network scanning and then leverage the input validation flaw.

Attack Vector

The attack is network-based and requires the target DVR to be accessible over the network with default credentials still configured. An attacker would first identify vulnerable Hitron HVR-4781 devices using network scanning techniques, then authenticate using well-known default administrator credentials. Once authenticated, the attacker exploits the improper input validation to initiate network attacks that can result in denial of service conditions.

The attack does not require user interaction and can be automated, making it suitable for mass exploitation campaigns targeting exposed DVR devices on the internet or within compromised networks.

Detection Methods for CVE-2024-22768

Indicators of Compromise

• Unexpected authentication attempts to DVR web interfaces using default credentials
• Anomalous network traffic patterns originating from or targeting Hitron DVR devices
• Service disruptions or availability issues on HVR-4781 systems
• Multiple failed or successful login attempts from unfamiliar IP addresses

Detection Strategies

• Monitor for authentication events using default administrator credentials on Hitron DVR devices
• Implement network intrusion detection rules to identify malformed requests targeting DVR management interfaces
• Deploy asset discovery scans to identify Hitron HVR-4781 devices running vulnerable firmware versions
• Configure SIEM alerting for unusual traffic volumes or patterns involving DVR device IP addresses

Monitoring Recommendations

• Enable comprehensive logging on all Hitron DVR devices and forward logs to a central SIEM platform
• Establish baseline network behavior for DVR systems to detect anomalous activity
• Monitor for port scanning activity targeting common DVR management ports
• Track firmware versions across all deployed Hitron devices to identify systems requiring updates

How to Mitigate CVE-2024-22768

Immediate Actions Required

• Change default administrator credentials on all Hitron HVR-4781 devices immediately
• Restrict network access to DVR management interfaces using firewall rules and network segmentation
• Audit all deployed Hitron DVR devices to identify systems running firmware versions 1.03 through 4.02
• Disable remote management access where not operationally required

Patch Information

Hitron Systems has released updated firmware to address this vulnerability. Administrators should visit the Hitron Firmware Repository to download and apply the latest firmware updates for affected HVR-4781 devices. Ensure firmware versions newer than 4.02 are installed on all affected systems.

Workarounds

• Implement strong, unique administrative passwords on all DVR devices as an immediate mitigation
• Place DVR systems behind a VPN or jump host to limit direct network exposure
• Deploy network access control lists (ACLs) to restrict management interface access to authorized IP addresses only
• Consider disabling unused network services and protocols on affected devices

# Network segmentation example using iptables
# Restrict access to DVR management port (adjust port as needed)
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

# Restrict SSH/Telnet access if enabled
iptables -A INPUT -p tcp --dport 22 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP