Executive Summary

This vulnerability exists in the SonicCloudOrg sonic-server up to version 2.0.0, specifically in the Upload function of the FileTool.java file within the File Upload Endpoint component.

The issue arises from improper handling of the 'Type' argument, which allows an attacker to perform a path traversal attack.

This means an attacker can manipulate the file path to access files and directories outside the intended upload directory.

The attack can be launched remotely, and an exploit for this vulnerability has been made public.

The vendor was contacted early about this issue but did not respond.

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Impact Analysis

This vulnerability can allow an attacker to access or overwrite files on the server by exploiting the path traversal flaw.

Such unauthorized access can lead to information disclosure, data tampering, or disruption of service.

Because the attack can be performed remotely without user interaction, it increases the risk of exploitation.

The CVSS scores indicate a moderate severity level, reflecting potential impacts on confidentiality, integrity, and availability.

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Compliance Impact

The vulnerability allows authenticated attackers to perform path traversal attacks via the file upload functionality, potentially leading to unauthorized file writes anywhere on the server filesystem.

This can result in confidentiality breaches through information disclosure of internal directory structures, integrity violations by overwriting files or planting malicious web shells, and availability issues by filling disk space.

Such impacts can lead to non-compliance with standards like GDPR and HIPAA, which require protection of sensitive data confidentiality, integrity, and availability.

Specifically, unauthorized access or modification of protected data due to this vulnerability could violate data protection and privacy requirements mandated by these regulations.

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Detection Guidance

This vulnerability can be detected by monitoring HTTP requests to the `/upload` and `/upload/v2` endpoints for suspicious usage of the `type` parameter containing directory traversal sequences such as `../` or `..\`.

You can use network traffic inspection tools or web server logs to identify requests with these patterns.

Example commands to detect such attempts include:

• Using grep on web server logs to find traversal attempts: `grep -E "type=.*(\.\./|\.\.\\)" /var/log/nginx/access.log`
• Using curl to test the endpoint for path traversal: `curl -X POST -F "type=../" -F "[email protected]" http://target/upload`
• Using intrusion detection systems (IDS) with rules to detect directory traversal payloads in HTTP parameters.

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Mitigation Strategies

Immediate mitigation steps include:

• Implement allowlist validation to restrict the `type` parameter to a predefined set of allowed folder names.
• Perform canonical path validation to ensure the resolved upload path remains within the intended base directory.
• Use path normalization techniques, such as Java NIO Path APIs, to sanitize and validate file paths before processing uploads.
• Monitor and block suspicious requests containing directory traversal sequences in the `type` parameter.
• Restrict access to the upload endpoints to trusted and authenticated users only, as the vulnerability requires authentication.

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