EUVD-2025-2100

Comprehensive Technical Analysis of EUVD-2025-2100

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-2100 is an Insecure Direct Object Reference (IDOR) in Anapi Group's h6web application. This vulnerability allows an authenticated attacker to access other users' information and potentially impersonate them by manipulating the “pkrelated” parameter in a POST request to the “/h6web/ha_datos_hermano.php” endpoint.

Severity Evaluation:

• CVSS Base Score: 9.1
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

The high base score of 9.1 indicates a critical vulnerability. The CVSS vector breakdown shows that the attack vector is network-based (AV:N), the attack complexity is low (AC:L), and the attacker requires low privileges (PR:L). The user interaction is not required (UI:N), and the scope is changed (S:C). The impact on confidentiality is high (C:H), integrity is low (I:L), and availability is low (A:L).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated User Exploitation: An attacker with valid credentials can exploit the IDOR vulnerability by modifying the “pkrelated” parameter in a POST request to access information belonging to other users.
• User Impersonation: The initial exploitation can lead to user impersonation, allowing the attacker to perform actions with the privileges of the impersonated user.

Exploitation Methods:

• Parameter Manipulation: The attacker can use tools like Burp Suite or OWASP ZAP to intercept and modify the “pkrelated” parameter in the POST request.
• Automated Scripts: Attackers may develop automated scripts to systematically exploit the vulnerability across multiple user accounts.

3. Affected Systems and Software Versions

Affected Systems:

• Product: H6Web
• Vendor: Anapi Group
• Versions: All versions

All versions of Anapi Group's H6Web application are affected by this vulnerability, indicating a widespread issue that requires immediate attention.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Access Controls: Implement strict access controls to ensure that users can only access their own data.
• Input Validation: Validate and sanitize all user inputs, especially parameters like “pkrelated.”
• Session Management: Enhance session management to prevent user impersonation.

Long-Term Mitigation:

• Code Review: Conduct a thorough code review to identify and fix all instances of IDOR vulnerabilities.
• Patch Management: Apply patches and updates provided by Anapi Group as soon as they are available.
• Security Training: Train developers on secure coding practices to prevent similar vulnerabilities in the future.

5. Impact on European Cybersecurity Landscape

The presence of this vulnerability in a widely used application like H6Web poses a significant risk to European organizations. The potential for data breaches and user impersonation can lead to loss of sensitive information, financial fraud, and reputational damage. This underscores the need for robust cybersecurity measures and continuous monitoring of applications for vulnerabilities.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /h6web/ha_datos_hermano.php
• Parameter: pkrelated
• Exploitation Method: Modify the pkrelated parameter in a POST request to refer to another user's data.

Detection and Monitoring:

• Log Analysis: Monitor logs for unusual POST requests to the affected endpoint.
• Intrusion Detection Systems (IDS): Implement IDS rules to detect and alert on suspicious parameter manipulation.
• Web Application Firewalls (WAF): Configure WAF to block requests with manipulated parameters.

Incident Response:

• Containment: Immediately contain the affected systems and isolate them from the network.
• Forensic Analysis: Conduct a forensic analysis to determine the extent of the breach and identify compromised accounts.
• Notification: Notify affected users and relevant authorities as per GDPR and other regulatory requirements.

References:

• INCIBE Notice
• NVD Detail

By addressing this vulnerability promptly and effectively, organizations can mitigate the risk of data breaches and ensure the security of their users' information.