EUVD-2025-19211

Comprehensive Technical Analysis of EUVD-2025-19211

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-19211, also known as CVE-2025-34043, is a remote command injection flaw in Vacron Network Video Recorder (NVR) devices version 1.4. The vulnerability arises due to improper input sanitization in the board.cgi script, allowing unauthenticated attackers to execute arbitrary commands on the underlying operating system via crafted HTTP requests.

Severity Evaluation:

• Base Score: 10.0 (Critical)
• Base Score Version: 4.0
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

The CVSS score of 10.0 indicates a critical vulnerability. The high scores in all impact metrics (VC:H, VI:H, VA:H, SC:H, SI:H, SA:H) underscore the potential for complete device compromise, including confidentiality, integrity, and availability impacts.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network Attack Vector (AV:N): The vulnerability can be exploited remotely over the network.
• Low Attack Complexity (AC:L): The attack does not require specialized conditions or knowledge.
• No Authentication Required (PR:N): The attacker does not need to be authenticated.
• No User Interaction Required (UI:N): The attack can be executed without any user interaction.

Exploitation Methods:

• Crafted HTTP Requests: An attacker can send specially crafted HTTP requests to the board.cgi script, injecting malicious commands.
• Command Injection: The injected commands are executed with the privileges of the web server process, leading to remote code execution.

3. Affected Systems and Software Versions

Affected Systems:

• Vacron Network Video Recorder (NVR) devices

Software Versions:

• Version 1.4

4. Recommended Mitigation Strategies

Immediate Actions:

• Patch Management: Apply the latest security patches provided by Vacron.
• Network Segmentation: Isolate NVR devices from public networks and restrict access to trusted IP addresses.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the board.cgi script.
• Input Validation: Ensure proper input validation and sanitization in all web applications.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activities.
• User Training: Educate users on the importance of cybersecurity best practices.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations using Vacron NVR devices, particularly in sectors such as surveillance, security, and law enforcement. The potential for full device compromise can lead to data breaches, loss of sensitive information, and disruption of critical services.

Regulatory Compliance:

• Organizations must ensure compliance with GDPR and other relevant regulations to protect personal data.
• Reporting and disclosure of the vulnerability should follow ENISA guidelines to maintain transparency and trust.

6. Technical Details for Security Professionals

Vulnerability Details:

• Script: board.cgi
• Input Sanitization Issue: The script does not properly sanitize user inputs, allowing command injection.
• Execution Privileges: Commands are executed with the privileges of the web server process, typically high privileges.

Detection and Response:

• Log Analysis: Monitor web server logs for unusual or malicious HTTP requests targeting the board.cgi script.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous activities indicative of command injection.
• Incident Response: Develop and implement an incident response plan to quickly address and mitigate any detected exploitation attempts.

References:

• Tenable Nessus Plugin
• SonicWall Blog
• SSD Disclosure
• Broadcom Attack Signatures
• VulnCheck Advisories
• Vacron Official Website

By addressing this vulnerability promptly and comprehensively, organizations can significantly reduce the risk of exploitation and ensure the security and integrity of their NVR devices.