EUVD-2025-6168

Comprehensive Technical Analysis of EUVD-2025-6168

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in FlowiseAI Flowise v2.2.6 is an arbitrary file upload vulnerability in the /api/v1/attachments endpoint. This type of vulnerability allows an attacker to upload malicious files to the server, potentially leading to remote code execution (RCE), data exfiltration, or other severe impacts.

Severity Evaluation:

• Base Score: 9.8 (Critical)
• Base Score Version: CVSS 3.1
• Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The CVSS score of 9.8 indicates a critical vulnerability. The vector string breaks down as follows:

• AV:N (Attack Vector: Network) - The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low) - The attack requires low complexity.
• PR:N (Privileges Required: None) - No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None) - No user interaction is required.
• S:U (Scope: Unchanged) - The vulnerability does not change the security scope.
• C:H (Confidentiality: High) - There is a high impact on confidentiality.
• I:H (Integrity: High) - There is a high impact on integrity.
• A:H (Availability: High) - There is a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: An attacker can exploit this vulnerability over the network without needing any special privileges or user interaction.
• Malicious File Uploads: The attacker can upload files containing malicious code, which can then be executed on the server.

Exploitation Methods:

• Remote Code Execution (RCE): By uploading a file with embedded malicious code, an attacker can gain control over the server.
• Data Exfiltration: An attacker can upload scripts that extract sensitive data from the server.
• Denial of Service (DoS): Uploading large files or files designed to crash the server can lead to a DoS condition.

3. Affected Systems and Software Versions

Affected Software:

• FlowiseAI Flowise v2.2.6

Affected Systems:

• Any system running FlowiseAI Flowise v2.2.6, particularly those with the /api/v1/attachments endpoint exposed to the internet.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Upgrade to a patched version of FlowiseAI Flowise if available.
• Disable the Endpoint: Temporarily disable the /api/v1/attachments endpoint until a patch is applied.
• Input Validation: Implement strict input validation and file type checks to prevent malicious uploads.

Long-Term Mitigation:

• Regular Updates: Ensure that all software is regularly updated and patched.
• Security Audits: Conduct regular security audits and vulnerability assessments.
• Network Segmentation: Implement network segmentation to limit the impact of a successful attack.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities.

5. Impact on European Cybersecurity Landscape

The discovery of this vulnerability highlights the importance of robust cybersecurity measures in the European Union. Given the critical nature of the vulnerability, organizations using FlowiseAI Flowise must act swiftly to mitigate risks. The EU's cybersecurity framework, including regulations like GDPR and NIS Directive, emphasizes the need for timely disclosure and remediation of vulnerabilities. This incident underscores the necessity for continuous monitoring and proactive security measures to protect against such threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /api/v1/attachments
• Code Reference: The vulnerability is located in the index.ts file between lines 165 and 190.

Exploitation Steps:

1. Identify the Target: Locate a server running FlowiseAI Flowise v2.2.6.
2. Craft Malicious File: Create a file with embedded malicious code.
3. Upload the File: Use the /api/v1/attachments endpoint to upload the malicious file.
4. Execute the Payload: Trigger the execution of the uploaded file to gain control or extract data.

Detection and Response:

• Log Monitoring: Monitor server logs for unusual file upload activities.
• File Integrity Monitoring: Use file integrity monitoring tools to detect unauthorized changes.
• Incident Response Plan: Have a well-defined incident response plan to quickly address any detected exploitation attempts.

References:

• NVD Entry
• FlowiseAI GitHub Repository
• Vulnerable Code Snippet
• Exploit Details

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their systems from potential attacks.