EUVD-2025-8729

Comprehensive Technical Analysis of EUVD-2025-8729

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in Unraid 7.0.0 before 7.0.1 allows remote users to access the Unraid WebGUI and web console as root without authentication. This issue arises when a container is running in Host networking mode with Use Tailscale enabled.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.6, which is classified as Critical. The CVSS vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H indicates the following:

• Attack Vector (AV): Adjacent network
• Attack Complexity (AC): Low
• Privileges Required (PR): None
• User Interaction (UI): None
• Scope (S): Changed
• Confidentiality (C): High
• Integrity (I): High
• Availability (A): High

This high severity score underscores the critical nature of the vulnerability, as it allows unauthenticated root access, leading to complete system compromise.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Adjacent Network Access: An attacker on the same network as the Unraid server can exploit this vulnerability.
• Remote Access: If the Unraid WebGUI or web console is exposed to the internet, remote attackers can exploit this vulnerability without any authentication.

Exploitation Methods:

• Direct Access: An attacker can directly access the Unraid WebGUI and web console as root by exploiting the vulnerability in the Host networking mode with Tailscale enabled.
• Automated Scripts: Attackers can use automated scripts to scan for vulnerable Unraid servers and exploit them en masse.

3. Affected Systems and Software Versions

Affected Systems:

• Unraid 7.0.0 before 7.0.1

Software Versions:

• Unraid 7.0.0

Configuration:

• Containers running in Host networking mode
• Use Tailscale enabled

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade: Upgrade to Unraid 7.0.1 or later, which addresses this vulnerability.
• Network Segmentation: Isolate Unraid servers from public networks and ensure they are not exposed to the internet.
• Disable Tailscale: Temporarily disable the Use Tailscale feature until the system is updated.

Long-Term Strategies:

• Regular Patching: Implement a regular patching and update schedule for all systems.
• Access Controls: Enforce strict access controls and authentication mechanisms.
• Monitoring: Implement continuous monitoring and logging to detect and respond to suspicious activities.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• Organizations using Unraid must ensure compliance with GDPR and other relevant regulations by addressing this vulnerability promptly.
• Failure to mitigate this vulnerability can result in data breaches, leading to regulatory penalties and loss of customer trust.

Cybersecurity Posture:

• The vulnerability highlights the importance of robust network security practices and regular software updates.
• European organizations must prioritize cybersecurity awareness and training to prevent such vulnerabilities from being exploited.

6. Technical Details for Security Professionals

Technical Overview:

• The vulnerability stems from a misconfiguration in the Host networking mode when Tailscale is enabled, allowing unauthenticated root access to the Unraid WebGUI and web console.
• The flaw is present in Unraid 7.0.0 and has been fixed in version 7.0.1.

Detection Methods:

• Network Scanning: Use network scanning tools to identify Unraid servers running vulnerable versions.
• Log Analysis: Analyze logs for unauthorized access attempts to the Unraid WebGUI and web console.

Mitigation Steps:

1. Update Unraid: Ensure all Unraid servers are updated to version 7.0.1 or later.
2. Configure Networking: Review and configure networking settings to avoid using Host networking mode with Tailscale enabled.
3. Implement Firewalls: Use firewalls to restrict access to the Unraid WebGUI and web console.
4. Enable Authentication: Ensure that all access to the Unraid WebGUI and web console requires authentication.

References:

• Unraid WebGUI GitHub
• Unraid 7.0.1 Release Notes
• CVE-2025-29266 Details
• NVD CVE-2025-29266

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of unauthorized access and potential data breaches.