EUVD-2025-4156

Comprehensive Technical Analysis of EUVD-2025-4156

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-4156 pertains to a CWE-306 "Missing Authentication for Critical Function" in the maxprofile/guest-mode/routes.lua file of Q-Free MaxTime versions up to and including 2.11.0. This flaw allows an unauthenticated remote attacker to enable passwordless guest mode via crafted HTTP requests.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability due to the following factors:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high score underscores the potential for severe impact on confidentiality, integrity, and availability of the affected systems.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the attack vector is network-based, an attacker can exploit this vulnerability remotely without needing physical access to the system.
• Crafted HTTP Requests: The attacker can send specially crafted HTTP requests to the vulnerable endpoint to enable passwordless guest mode.

Exploitation Methods:

• Unauthenticated Access: The attacker does not need any credentials to exploit this vulnerability.
• Automated Scripts: Attackers can use automated scripts to send the crafted HTTP requests, making it easier to exploit multiple systems simultaneously.

3. Affected Systems and Software Versions

Affected Systems:

• Q-Free MaxTime versions up to and including 2.11.0.

Software Versions:

• All versions of Q-Free MaxTime from 0 to 2.11.0 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Upgrade to a patched version of Q-Free MaxTime that addresses this vulnerability.
• Network Segmentation: Isolate vulnerable systems from public networks to limit exposure.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the vulnerable endpoint.

Long-Term Mitigation:

• Regular Updates: Ensure that all software is regularly updated and patched.
• Access Controls: Implement robust authentication and authorization mechanisms.
• Monitoring: Deploy intrusion detection and prevention systems to monitor for suspicious activity.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using Q-Free MaxTime within the European Union. Given the critical nature of the vulnerability, it could lead to unauthorized access, data breaches, and potential disruption of services. This underscores the need for vigilant cybersecurity practices and timely patch management across the EU.

6. Technical Details for Security Professionals

Vulnerability Details:

• File Affected: maxprofile/guest-mode/routes.lua
• Vulnerability Type: CWE-306 "Missing Authentication for Critical Function"
• Exploit Method: Crafted HTTP requests to enable passwordless guest mode.

Detection and Response:

• Log Analysis: Monitor logs for unusual HTTP requests targeting the guest-mode endpoint.
• Intrusion Detection: Use IDS/IPS to detect and block malicious HTTP requests.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• Advisory: Nozomi Networks Vulnerability Advisory

Conclusion: The vulnerability EUVD-2025-4156 is critical and requires immediate attention. Organizations should prioritize patching and implementing robust security measures to mitigate the risk. Continuous monitoring and a proactive approach to cybersecurity are essential to protect against such vulnerabilities.