EUVD-2025-31715

Comprehensive Technical Analysis of EUVD-2025-31715

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in PAD CMS's photo upload functionality allows an unauthenticated remote attacker to upload files of any type and extension without restriction. This can lead to Remote Code Execution (RCE) due to the lack of proper permission checks.

Severity Evaluation:

• Base Score: 10.0 (Critical)
• Base Score Version: CVSS 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 across all metrics (Attack Vector, Attack Complexity, Privileges Required, User Interaction, etc.) underscore the severity and ease of exploitation.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Remote Attack: An attacker can exploit this vulnerability without needing any authentication.
• File Upload: The attacker can upload malicious files, including executable scripts, through the photo upload functionality.

Exploitation Methods:

• Arbitrary File Upload: The attacker can upload files with malicious payloads, such as PHP scripts, that can be executed on the server.
• Remote Code Execution (RCE): Once the malicious file is uploaded, the attacker can execute arbitrary code on the server, leading to full system compromise.

3. Affected Systems and Software Versions

Affected Product:

• PAD CMS

Affected Versions:

• All versions from 0 to 1.2.1

Affected Templates:

• www
• bip
• ww+bip

Vendor:

• Polska Akademia Dostępności

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Disable Photo Upload Functionality: Temporarily disable the photo upload feature until a permanent solution is implemented.
• Implement Access Controls: Restrict access to the photo upload functionality to trusted users only.
• Monitor and Log: Increase monitoring and logging of file upload activities to detect and respond to suspicious behavior.

Long-Term Mitigation:

• Upgrade or Replace: Since the product is End-Of-Life (EOL) and no patches will be provided, consider upgrading to a supported version or replacing PAD CMS with a more secure alternative.
• Implement Web Application Firewall (WAF): Deploy a WAF to filter out malicious upload attempts.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

Immediate Impact:

• Widespread Exploitation: Given the critical nature and ease of exploitation, this vulnerability poses a significant risk to organizations using PAD CMS.
• Data Breaches: Successful exploitation can lead to data breaches, unauthorized access, and potential data exfiltration.

Long-Term Impact:

• Reputation Damage: Organizations affected by this vulnerability may suffer reputational damage and loss of customer trust.
• Regulatory Compliance: Failure to address this vulnerability may result in non-compliance with European data protection regulations, such as GDPR.

6. Technical Details for Security Professionals

Technical Analysis:

• Client-Controlled Permission Check: The vulnerability arises from the lack of proper server-side validation of file types and extensions. The client can control the permission check parameter, allowing for the upload of any file type.
• Execution of Malicious Files: Once uploaded, malicious files can be executed on the server, leading to RCE. This can be achieved through various scripting languages supported by the server (e.g., PHP, Python).

Detection and Response:

• Intrusion Detection Systems (IDS): Implement IDS to detect unusual file upload activities and potential exploitation attempts.
• Incident Response Plan: Develop and maintain an incident response plan to quickly address and mitigate any successful exploitation.

References:

• CERT-PL Post
• NVD Detail

Conclusion: The vulnerability in PAD CMS's photo upload functionality is critical and requires immediate attention. Organizations using PAD CMS should prioritize mitigation strategies to prevent potential exploitation and consider long-term solutions, such as upgrading or replacing the CMS. The European cybersecurity landscape must remain vigilant against such vulnerabilities to protect against data breaches and ensure compliance with regulatory standards.