Path Traversal in mcp-bases Research Server

Executive Summary

This vulnerability exists in the ezequiroga mcp-bases project, specifically in the function search_papers within the file research_server.py. It involves a path traversal issue caused by manipulating the argument 'topic'. This allows an attacker to access files or directories outside the intended scope.

The vulnerability can be exploited remotely, and the exploit code is publicly available. The project uses a rolling release model, so specific affected versions are not detailed.

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Detection Guidance

This vulnerability can be detected by monitoring for unusual or unauthorized path traversal attempts in the 'topic' parameter used by the search_papers function in research_server.py. Specifically, inputs containing path separators like '../' that lead to directory traversal outside the intended papers/ directory indicate exploitation attempts.

To detect exploitation attempts on your system, you can check server logs or network traffic for requests invoking the search_papers tool with suspicious topic arguments containing path traversal patterns.

Suggested commands include searching for such patterns in logs or running manual tests against the server endpoint that handles the topic parameter.

• Use grep or similar tools to find suspicious inputs in logs, e.g., `grep -r "../" /path/to/logs`
• Manually test the search_papers function by sending requests with payloads like '../escape-test' to see if the server creates files or directories outside the intended scope.

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Impact Analysis

Exploitation of this vulnerability can allow an attacker to perform unauthorized path traversal, potentially accessing sensitive files or data on the server running the vulnerable software.

Since the vulnerability can be exploited remotely without authentication, it increases the risk of data exposure or system compromise.

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Compliance Impact

The vulnerability allows path traversal and arbitrary file write on the server, leading to high integrity risks due to unauthorized file creation or modification outside intended directories.

Such integrity risks could impact compliance with standards and regulations like GDPR and HIPAA, which require protection of data integrity and prevention of unauthorized data modification.

However, the vulnerability is noted to have low confidentiality and availability risks, which may limit its direct impact on data privacy requirements.

No explicit information is provided about direct effects on compliance with these regulations in the provided resources.

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Mitigation Strategies

Immediate mitigation steps include:

• Reject or sanitize any "topic" parameter values containing path separators such as "../" to prevent directory traversal.
• Enforce path containment by canonicalizing paths before use to ensure they remain within the intended papers/ directory.
• Restrict access to the search_papers tool to trusted users only.
• Implement input validation to use opaque identifiers instead of user-controlled file paths.
• Monitor and audit file system changes to detect unauthorized file writes.

A recommended fix involves updating the code to canonicalize paths and adding regression tests to prevent recurrence.

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