EUVD-2025-204006

Comprehensive Technical Analysis of EUVD-2025-204006

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-204006 pertains to an authentication bypass issue in the Zerobyte backup automation tool. This flaw allows unauthorized access to certain API endpoints due to improper application of authentication middleware. The severity of this vulnerability is rated with a CVSS Base Score of 9.1, which is considered critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N indicates the following:

• Attack Vector (AV:N): The vulnerability is exploitable over the network.
• Attack Complexity (AC:L): The attack requires low complexity.
• Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is required.
• Scope (S:U): The vulnerability does not change the security scope.
• Confidentiality (C:H): There is a high impact on confidentiality.
• Integrity (I:H): There is a high impact on integrity.
• Availability (A:N): There is no impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Given the nature of the vulnerability, potential attack vectors include:

• Unauthorized Data Access: Attackers can access sensitive data through unprotected API endpoints.
• Data Manipulation: Attackers can modify or delete data, leading to data integrity issues.
• Privilege Escalation: Attackers might use the unauthorized access to escalate privileges within the system.
• Lateral Movement: Attackers can use the compromised Zerobyte instance to move laterally within the network.

Exploitation methods could involve:

• Network Scanning: Identifying exposed Zerobyte instances on the internet.
• API Fuzzing: Testing various API endpoints to find those that are unprotected.
• Automated Scripts: Using scripts to automate the exploitation process, making it easier to target multiple instances.

3. Affected Systems and Software Versions

The vulnerability affects Zerobyte versions prior to 0.18.5 and 0.19.0. Specifically:

• Zerobyte < 0.18.5
• Zerobyte < 0.19.0

Users running these versions are at risk and should prioritize updating to the patched versions.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Immediate Upgrade: Upgrade to Zerobyte version 0.18.5 or 0.19.0, which contain the fix for the authentication bypass issue.
• Network Segmentation: Restrict network access to the Zerobyte instance to trusted networks only using firewall rules or network segmentation.
• Monitoring and Logging: Implement robust monitoring and logging to detect any unauthorized access attempts.
• Regular Audits: Conduct regular security audits to identify and address vulnerabilities proactively.

5. Impact on European Cybersecurity Landscape

The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of backup automation tools like Zerobyte. Organizations that rely on Zerobyte for their backup needs are at risk of data breaches, data manipulation, and potential compliance violations under regulations such as GDPR. The critical nature of the vulnerability underscores the need for vigilant cybersecurity practices and timely patch management.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Identification: The vulnerability is identified as CVE-2025-68435 and is assigned by GitHub_M.
• References:
  • GitHub Security Advisory
  • GitHub Issue
  • GitHub Commit
• ENISA IDs:
  • Product: 519e5be4-d4b3-39ee-bc70-b710a99d8b60
  • Vendor: c172aae3-4f71-3127-a2a7-a97432e7f88c

Security professionals should review these references for additional context and ensure that their organizations are aware of the vulnerability and the necessary mitigation steps.

Conclusion

The authentication bypass vulnerability in Zerobyte versions prior to 0.18.5 and 0.19.0 poses a critical risk to organizations using this tool. Immediate action, including upgrading to the patched versions and implementing robust network security measures, is essential to mitigate the risk. The European cybersecurity landscape must remain vigilant against such vulnerabilities to protect sensitive data and maintain compliance with regulatory standards.