EUVD-2024-19224

Comprehensive Technical Analysis of EUVD-2024-19224

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in the ComfyUI-Impact-Pack, specifically in the /upload/temp endpoint, is a Path Traversal issue. This vulnerability allows an attacker to manipulate the image.filename field in a POST request, leading to the potential writing of arbitrary files to the file system. The severity of this vulnerability is significant, as it can result in remote code execution (RCE) under certain conditions.

Severity Evaluation:

• Base Score: 9.2
• Base Score Version: 4.0
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

The high base score indicates a critical vulnerability due to the potential for remote code execution, which can have severe impacts on the integrity and availability of the affected systems.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Path Traversal: An attacker can exploit the lack of validation in the image.filename field to traverse directories and write files to unintended locations.
• Remote Code Execution (RCE): By writing specific files to critical system directories, an attacker can execute arbitrary code on the server.

Exploitation Methods:

• Crafted POST Requests: An attacker can send specially crafted POST requests to the /upload/temp endpoint with manipulated image.filename values to achieve path traversal.
• File Upload Manipulation: The attacker can upload files with names designed to traverse directories and overwrite critical system files or configuration files.

3. Affected Systems and Software Versions

Affected Software:

• ComfyUI-Impact-Pack
• Versions: 0 < 7.6.2

Vendor:

• ltdrdata

All systems running the ComfyUI-Impact-Pack extension with versions prior to 7.6.2 are vulnerable to this issue.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Upgrade to ComfyUI-Impact-Pack version 7.6.2 or later, which includes a fix for this vulnerability.
• Input Validation: Implement strict validation for the image.filename field to prevent path traversal.
• Access Controls: Restrict access to the /upload/temp endpoint to trusted users only.
• Monitoring: Implement monitoring and logging for suspicious activities related to file uploads and directory traversal attempts.

Long-Term Mitigation:

• Security Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.
• Security Training: Provide training for developers on secure coding practices to prevent future occurrences of such vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability in ComfyUI-Impact-Pack poses a significant risk to organizations using this software within the European Union. Given the potential for remote code execution, this vulnerability can be exploited to compromise critical systems, leading to data breaches, service disruptions, and potential financial losses. The high severity score underscores the need for immediate action to mitigate the risk.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /upload/temp
• Field: image.filename
• Issue: Missing validation allows path traversal and arbitrary file writing.

References:

• GitHub Commit: a43dae373e648ae0f0cc0c9768c3cea6a72acff7
• Source Code: impact_server.py#L28

Mitigation Steps:

1. Update Software: Ensure all instances of ComfyUI-Impact-Pack are updated to version 7.6.2 or later.
2. Implement Validation: Add server-side validation to sanitize the image.filename field.
3. Restrict Access: Limit access to the /upload/temp endpoint to authorized users only.
4. Monitor Logs: Set up alerts for any unusual file upload activities.

By addressing this vulnerability promptly, organizations can significantly reduce the risk of exploitation and maintain the integrity and security of their systems.