EUVD-2025-203055

Comprehensive Technical Analysis of EUVD-2025-203055

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-203055 affects Fireshare, a self-hosted media and link-sharing application. The issue arises from improper handling of filenames during video file uploads, leading to potential path traversal and Remote Code Execution (RCE). The severity of this vulnerability is rated with a CVSS Base Score of 9.8, indicating a critical risk. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following characteristics:

• Attack Vector (AV:N): The vulnerability can be exploited over the network.
• Attack Complexity (AC:L): The attack requires low complexity.
• Privileges Required (PR:N): No privileges are required for exploitation.
• User Interaction (UI:N): No user interaction is needed.
• Scope (S:U): The impact is unchanged.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vectors for this vulnerability include:

• Authenticated Users: Users with valid credentials can upload a video file with a malicious filename.
• Unauthenticated Users: If the "Public Uploads" setting is enabled, even unauthenticated users can exploit this vulnerability.

Exploitation methods involve crafting a filename that, when concatenated into a shell command, can execute arbitrary system commands. This can lead to:

• Path Traversal: Uploading files to arbitrary directories.
• Remote Code Execution (RCE): Executing system commands, potentially leading to full system compromise.

3. Affected Systems and Software Versions

The vulnerability affects Fireshare versions 1.2.30 and below. The issue has been resolved in version 1.3.0. Organizations and individuals using Fireshare should ensure they are running version 1.3.0 or later to mitigate this risk.

4. Recommended Mitigation Strategies

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

• Upgrade Fireshare: Immediately upgrade to Fireshare version 1.3.0 or later.
• Disable Public Uploads: If upgrading is not immediately possible, disable the "Public Uploads" setting to limit the attack surface.
• Input Validation: Implement strict input validation for filenames to prevent the injection of malicious commands.
• Monitoring and Logging: Enhance monitoring and logging to detect any suspicious upload activities.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and address similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability in Fireshare poses a significant risk to organizations and individuals within the European Union, particularly those relying on self-hosted media and link-sharing solutions. The potential for RCE can lead to data breaches, unauthorized access, and system compromise, impacting the confidentiality, integrity, and availability of information. Given the critical nature of the vulnerability, it underscores the importance of timely patch management and proactive security measures in the European cybersecurity landscape.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Identification: The vulnerability is identified as CVE-2025-67728 and EUVD-2025-203055.
• Exploit Mechanism: The exploit involves crafting a filename that includes shell commands, which are then executed due to improper sanitization.
• Code Review: Review the commit 157386c85f6683f89192dae52115069b435b6d34 on the Fireshare GitHub repository for the specific code changes that address this vulnerability.
• Security Advisory: Refer to the GitHub security advisory GHSA-c4f5-g622-q72m for additional details and guidance.
• ENISA IDs: The ENISA IDs for the product and vendor are 015e7d27-4c92-3d08-a00a-482add120638 and 9a299fc0-77a5-3d90-950b-a09e2f1b1349, respectively.

By understanding these details, security professionals can better assess the risk, implement appropriate mitigations, and ensure the security of their systems.

Conclusion

The vulnerability in Fireshare, as described in EUVD-2025-203055, represents a critical risk that requires immediate attention. Organizations should prioritize upgrading to the patched version and implement additional security measures to protect against potential exploitation. The European cybersecurity landscape must remain vigilant against such threats to maintain the integrity and security of digital infrastructure.