Hunt Electronic DVR Flaw Leaks Administrator Credentials in Plaintext

A critical security flaw (CVE-2025-6561) in Hunt Electronics’ hybrid DVR systems allows unauthenticated attackers to remotely access plaintext administrator credentials.

Rated 9.8 on the CVSS scale (Critical), this vulnerability affects HBF-09KD and HBF-16NK models running firmware versions up to V3.1.67_1786 BB11115.

Attackers can directly retrieve system configuration files containing unencrypted credentials without authentication, enabling full device compromise and potential network infiltration.

Technical Analysis of CVE-2025-6561

The vulnerability stems from improper access controls (CWE-497) that fail to restrict unauthorized access to sensitive system configuration files.

Specifically:

• Attackers exploit exposed network interfaces to retrieve system.conf files
• Credentials are stored in plaintext (violating CWE-256 security practices)
• No authentication required for exploitation (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
  Affected devices establish connections to ThroughTek Kalay P2P servers (e.g., m4.iotcplatform[.]com), expanding the attack surface through third-party SDK vulnerabilities like CVE-2021-28372.

Immediate Risks and Mitigation Requirements

Successful exploitation enables:

1. Complete DVR system takeover
2. Surveillance feed manipulation
3. Lateral network movement
4. Permanent credential compromise
   Hunt Electronic released firmware V3.1.70_1806 BB50604 to patch the vulnerability.
5. Critical mitigation steps include:

• Immediately isolating affected DVRs from networks
• Disabling remote access features
• Rotating all administrator credentials
• Updating to the patched firmware before reconnecting devices

Broader IoT Security Implications

This incident highlights systemic IoT supply-chain vulnerabilities where third-party components (like ThroughTek’s SDK) create hidden risks.

Enterprise security teams must:

text1. Implement network segmentation for surveillance systems  
2. Deploy behavior-based anomaly detection  
3. Maintain firmware update compliance  
4. Audit third-party SDK dependencies in IoT devices[2][5]

The Taiwan CERT (TWNCERT) credited researchers Yu-Chieh Kuo, Shi-Yi Xie, and colleagues for discovering CVE-2025-6561.

As of June 27, 2025, no public exploits exist, but unpatched systems remain critically vulnerable to credential harvesting attacks.

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