EUVD-2025-206140

Comprehensive Technical Analysis of EUVD-2025-206140

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-206140 affects the Signal K Server, a central hub application used in marine environments. The issue allows an unauthenticated attacker to manipulate the internal state of the server via the /skServer/validateBackup endpoint, leading to the overwriting of critical configuration files such as security.json and package.json. This can result in account takeover and Remote Code Execution (RCE).

Severity Evaluation:

• CVSS Base Score: 9.7
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

The high base score of 9.7 indicates a critical vulnerability. The CVSS vector breakdown shows:

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

This vulnerability is severe due to its potential for remote exploitation without authentication, leading to significant impacts on confidentiality, integrity, and availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attack: An attacker can exploit this vulnerability over the network without needing local access.
• Unauthenticated Access: The attacker does not require any credentials to exploit the vulnerability.

Exploitation Methods:

• State Pollution: The attacker can send crafted requests to the /skServer/validateBackup endpoint to manipulate the restoreFilePath variable.
• Configuration Overwrite: By manipulating the restoreFilePath, the attacker can overwrite critical configuration files, leading to account takeover and RCE.

3. Affected Systems and Software Versions

Affected Systems:

• Signal K Server versions prior to 2.19.0.

Software Versions:

• All versions of Signal K Server below 2.19.0 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade: Upgrade to Signal K Server version 2.19.0 or later, which includes the patch for this vulnerability.
• Network Segmentation: Isolate the Signal K Server from public networks to limit exposure.
• Access Controls: Implement strict access controls and monitoring to detect and prevent unauthorized access.

Long-Term Strategies:

• Regular Patching: Ensure that all software, including Signal K Server, is regularly updated to the latest versions.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential risks.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activity.

5. Impact on European Cybersecurity Landscape

The vulnerability in Signal K Server poses a significant risk to the European cybersecurity landscape, particularly in the marine and maritime sectors. Given the critical nature of these systems, a successful exploit could lead to:

• Operational Disruptions: Compromise of navigation and communication systems.
• Data Breaches: Unauthorized access to sensitive data.
• Safety Risks: Potential safety hazards due to compromised systems.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /skServer/validateBackup
• Parameter: restoreFilePath
• Impact: Overwriting of security.json and package.json files.

Exploitation Steps:

1. Identify Target: Locate a vulnerable Signal K Server instance.
2. Craft Request: Create a malicious request targeting the /skServer/validateBackup endpoint.
3. Manipulate State: Modify the restoreFilePath to point to a malicious configuration file.
4. Trigger Restore: Trigger the administrator's "Restore" functionality to overwrite critical files.

Detection and Response:

• Log Analysis: Monitor server logs for unusual activity related to the /skServer/validateBackup endpoint.
• File Integrity Monitoring: Implement file integrity monitoring to detect unauthorized changes to configuration files.
• Incident Response: Develop and maintain an incident response plan to quickly address any detected exploitation attempts.

References:

• GitHub Security Advisory
• Signal K Server Release Notes

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with EUVD-2025-206140 and enhance their overall cybersecurity posture.