EUVD-2025-37030

Comprehensive Technical Analysis of EUVD-2025-37030

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-37030 affects JumpServer, an open-source bastion host and operation and maintenance security audit system. The issue allows an authenticated, non-privileged user to retrieve connection tokens belonging to other users via the super-connection API endpoint. This vulnerability is critical due to its potential for unauthorized access and privilege escalation.

Severity Evaluation:

• Base Score: 9.6
• Base Score Version: 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

The CVSS score of 9.6 indicates a critical vulnerability. The key factors contributing to this high score include:

• Attack Vector (AV:N): The vulnerability can be exploited over the network.
• Attack Complexity (AC:L): The attack requires low complexity.
• Privileges Required (PR:L): The attacker needs low-level privileges.
• User Interaction (UI:N): No user interaction is required.
• Scope (S:C): The vulnerability affects components beyond the security scope managed by the security authority.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:N): No impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated User Exploitation: An attacker with valid credentials but limited privileges can exploit the vulnerability by accessing the super-connection API endpoint.
• Token Retrieval: The attacker can retrieve connection tokens belonging to other users, which can then be used to initiate connections to managed assets.

Exploitation Methods:

• API Access: The attacker sends a request to the /api/v1/authentication/super-connection-token/ endpoint.
• Token Misuse: The retrieved tokens can be used to impersonate other users and gain unauthorized access to sensitive systems.

3. Affected Systems and Software Versions

Affected Versions:

• JumpServer versions prior to v3.10.20-lts
• JumpServer versions prior to v4.10.11-lts

Fixed Versions:

• JumpServer v3.10.20-lts
• JumpServer v4.10.11-lts

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to the patched versions (v3.10.20-lts or v4.10.11-lts) as soon as possible.
• Access Control: Implement strict access controls to limit the number of users with access to the super-connection API endpoint.
• Monitoring: Enhance monitoring and logging for the super-connection API endpoint to detect any suspicious activities.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits and vulnerability assessments.
• User Education: Educate users about the importance of secure practices and the risks associated with unauthorized access.
• Incident Response Plan: Develop and maintain an incident response plan to quickly address any potential breaches.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using JumpServer, particularly those in critical infrastructure sectors such as finance, healthcare, and government. Unauthorized access to sensitive systems can lead to data breaches, financial loss, and reputational damage. The European Union's emphasis on data protection and privacy (e.g., GDPR) underscores the importance of addressing such vulnerabilities promptly.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /api/v1/authentication/super-connection-token/
• Issue: The endpoint returns connection tokens created by all users instead of restricting results to tokens owned by or authorized for the requester.
• Exploitation: An authenticated, non-privileged user can retrieve and misuse these tokens to gain unauthorized access.

Detection and Response:

• Log Analysis: Analyze logs for unusual access patterns to the super-connection API endpoint.
• Intrusion Detection Systems (IDS): Implement IDS rules to detect and alert on suspicious activities related to the API endpoint.
• Patch Management: Ensure that all instances of JumpServer are updated to the patched versions.

References:

• GitHub Security Advisory
• GitHub Commit

By addressing this vulnerability promptly and implementing robust mitigation strategies, organizations can significantly reduce the risk of unauthorized access and privilege escalation, thereby enhancing their overall cybersecurity posture.