EUVD-2025-31710

Comprehensive Technical Analysis of EUVD-2025-31710

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in PAD CMS's upload photo 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:

• CVSS Base Score: 10.0 (Critical)
• CVSS 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 high CVSS score indicates that this vulnerability is extremely severe. The attack vector is network-based (AV:N), requires low complexity (AC:L), and does not need any user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (VC:H, VI:H, VA:H), and the scope change is also high (SC:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Remote Attack: An attacker can exploit this vulnerability without needing any credentials.
• File Upload: The attacker can upload malicious files, such as scripts or executables, to the server.
• Remote Code Execution: Once the malicious file is uploaded, the attacker can execute it, leading to full control over the server.

Exploitation Methods:

• Direct File Upload: The attacker can directly upload a malicious file through the photo upload functionality.
• Script Injection: The attacker can inject scripts that can be executed on the server, leading to RCE.
• Payload Delivery: The attacker can use this vulnerability to deliver payloads that can further compromise the system.

3. Affected Systems and Software Versions

Affected Product:

• PAD CMS
• Versions: 0 ≤ 1.2.1

Affected Templates:

• www
• bip
• ww+bip

Vendor:

• Polska Akademia Dostępności

Note: The product is End-Of-Life (EOL), and no patches will be provided by the vendor.

4. Recommended Mitigation Strategies

Immediate Actions:

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

Long-Term Solutions:

• Upgrade or Replace: Consider upgrading to a supported version of the CMS or replacing it with a more secure alternative.
• Implement File Validation: Ensure that only allowed file types and extensions are accepted for upload.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

Regional Impact:

• Widespread Use: If PAD CMS is widely used in Europe, this vulnerability poses a significant risk to organizations using it.
• Critical Infrastructure: Organizations in critical sectors such as healthcare, finance, and government may be particularly vulnerable.
• Compliance Issues: Non-compliance with data protection regulations (e.g., GDPR) due to potential data breaches.

Economic and Reputational Impact:

• Financial Losses: Organizations may face financial losses due to data breaches and system downtime.
• Reputation Damage: Loss of trust from customers and partners due to security incidents.

6. Technical Details for Security Professionals

Technical Analysis:

• Permission Check Parameter: The vulnerability arises from a client-controlled permission check parameter, which allows attackers to bypass restrictions.
• File Upload Mechanism: The upload functionality does not validate file types and extensions, allowing any file to be uploaded.
• Execution Environment: The uploaded files can be executed in the server environment, leading to RCE.

Detection and Response:

• Intrusion Detection Systems (IDS): Implement IDS to detect and alert on suspicious upload activities.
• Incident Response Plan: Develop and maintain an incident response plan to quickly address any security incidents.
• Patch Management: Although the product is EOL, consider applying community-developed patches or workarounds if available.

References:

• CERT-PL Post
• NVD Detail

Conclusion: The vulnerability in PAD CMS's upload photo functionality is critical and requires immediate attention. Organizations using this CMS should take proactive measures to mitigate the risk and consider long-term solutions to ensure the security of their systems.