CVE-2025-66261

Comprehensive Technical Analysis of CVE-2025-66261

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-66261 CVSS Score: 9.8

The vulnerability in question is an Unauthenticated OS Command Injection in the restore_settings.php script of DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter. This vulnerability allows an attacker to inject arbitrary shell commands through the name parameter, which is passed to the exec() function without proper validation or escaping. The high CVSS score of 9.8 indicates a critical severity due to the potential for unauthenticated remote code execution (RCE), which can lead to full system compromise.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: The vulnerability can be exploited without requiring any authentication, making it accessible to any attacker with network access to the affected device.
• URL-Decoded Parameter: The name parameter is URL-decoded and directly passed to exec(), allowing for the injection of shell commands.

Exploitation Methods:

• Command Injection: An attacker can craft a URL with the name parameter containing shell metacharacters (;, |, &&, etc.) to inject and execute arbitrary commands.
• Example Exploit:

  http://target_device/var/tdf/restore_settings.php?name=;id
  

  This would execute the id command on the target system, revealing user information.

3. Affected Systems and Software Versions

Affected Systems:

• DB Electronica Telecomunicazioni S.p.A. Mozart FM Transmitter

Affected Versions:

• Versions 30, 50, 100, 300, 500, 1000, 2000, 3000, 3500, 6000, 7000

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Network Segmentation: Isolate affected devices from public networks to limit access.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the restore_settings.php endpoint.

Long-Term Mitigation:

• Patch Management: Apply vendor-provided patches or updates as soon as they are available.
• Input Validation: Ensure all user inputs are properly validated and sanitized before being used in system commands.
• Least Privilege: Run the web server with the least privileges necessary to minimize the impact of a successful exploit.
• Regular Audits: Conduct regular security audits and code reviews to identify and fix similar vulnerabilities.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability highlights the critical importance of input validation and proper handling of user-controlled data in web applications. Unauthenticated RCE vulnerabilities pose a significant risk to organizations, as they can be exploited to gain full control over affected systems. This underscores the need for robust security practices, including regular patching, thorough code reviews, and comprehensive security testing.

6. Technical Details for Security Professionals

Vulnerable Code Snippet:

$name = urldecode($_GET["name"]);
exec("some_command " . $name);

Exploitation Details:

• The urldecode() function decodes the URL-encoded name parameter.
• The decoded name parameter is then directly passed to the exec() function without any validation or escaping.
• An attacker can inject shell commands by including metacharacters in the name parameter.

Example Exploit Payload:

http://target_device/var/tdf/restore_settings.php?name=;rm%20-rf%20/

This payload would attempt to delete all files on the system, demonstrating the potential for severe damage.

Detection and Monitoring:

• Log Analysis: Monitor web server logs for suspicious access patterns to the restore_settings.php endpoint.
• Intrusion Detection Systems (IDS): Implement IDS rules to detect and alert on attempts to exploit this vulnerability.

Conclusion: CVE-2025-66261 represents a critical security risk due to its potential for unauthenticated RCE. Immediate mitigation strategies should focus on limiting network access and applying vendor patches. Long-term, organizations should prioritize input validation, regular security audits, and adherence to best practices in secure coding to prevent similar vulnerabilities in the future.

References:

• Exploit and Third Party Advisory

This comprehensive analysis provides a clear understanding of the vulnerability, its potential impact, and the necessary steps to mitigate the risk effectively.