EUVD-2023-35419

Comprehensive Technical Analysis of EUVD-2023-35419

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-35419, also known as CVE-2023-31090, pertains to an "Unrestricted Upload of File with Dangerous Type" in the Unlimited Elements For Elementor plugin. This vulnerability allows an attacker to upload a web shell to a web server, which can lead to complete system compromise. The CVSS (Common Vulnerability Scoring System) base score of 9.9 indicates a critical severity level. The scoring vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

• AV:N (Attack Vector: Network): The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low): The attack requires minimal skill or resources.
• PR:L (Privileges Required: Low): The attacker needs low-level privileges to exploit the vulnerability.
• UI:N (User Interaction: None): No user interaction is required for the attack to succeed.
• S:C (Scope: Changed): The vulnerability affects a different security scope.
• C:H (Confidentiality: High): The vulnerability results in a high impact on confidentiality.
• I:H (Integrity: High): The vulnerability results in a high impact on integrity.
• A:H (Availability: High): The vulnerability results in a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves uploading a malicious file, such as a web shell, to the web server. This can be achieved through the plugin's file upload functionality, which does not adequately restrict file types. Once a web shell is uploaded, an attacker can execute arbitrary commands on the server, leading to:

• Remote Code Execution (RCE): The attacker can run malicious code on the server.
• Data Exfiltration: Sensitive data can be stolen.
• System Compromise: The attacker can gain full control over the server.

3. Affected Systems and Software Versions

The vulnerability affects the Unlimited Elements For Elementor plugin versions from n/a through 1.5.60. Any WordPress site using this plugin within the specified version range is at risk.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps should be taken:

• Update the Plugin: Ensure that the Unlimited Elements For Elementor plugin is updated to a version higher than 1.5.60, where the vulnerability has been patched.
• Implement File Upload Restrictions: Configure the server to restrict the types of files that can be uploaded.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.
• Monitor for Suspicious Activity: Implement monitoring tools to detect and respond to any suspicious activity on the server.
• Use Web Application Firewalls (WAF): Deploy WAFs to filter out malicious uploads and other attack vectors.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals using the affected plugin. Given the widespread use of WordPress and its plugins, the potential for large-scale exploitation is high. This underscores the importance of timely patching and proactive security measures to protect against such vulnerabilities.

6. Technical Details for Security Professionals

• Vulnerability Type: Unrestricted Upload of File with Dangerous Type
• Affected Plugin: Unlimited Elements For Elementor
• Affected Versions: n/a through 1.5.60
• Exploitation Method: Uploading a web shell through the plugin's file upload functionality
• Impact: Remote Code Execution, Data Exfiltration, System Compromise
• Mitigation: Update to a patched version, implement file upload restrictions, use WAFs, conduct regular security audits

Conclusion

EUVD-2023-35419 is a critical vulnerability that requires immediate attention from cybersecurity professionals. By understanding the attack vectors, affected systems, and recommended mitigation strategies, organizations can effectively protect against this threat and maintain the integrity of their web applications. Regular updates and proactive security measures are essential to safeguard against similar vulnerabilities in the future.