Path Traversal in OctoPrint File Download API

Executive Summary

This vulnerability is a path traversal issue in OctoPrint 1.0.0. It exists in the _validate function of the file src/octoprint/server/api/files.py, specifically in the File Download API component. The flaw allows manipulation of the filename argument, enabling unauthorized access to files outside the intended directory.

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Detection Guidance

This vulnerability involves path traversal in OctoPrint's File Download API due to improper validation of the filename argument. To detect it, monitor network traffic for unusual file access patterns or requests containing path traversal sequences like '../'. Check OctoPrint logs for suspicious API calls to /api/files with manipulated filenames. Ensure your OctoPrint instance is updated to the latest version to mitigate this issue.

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Impact Analysis

An attacker could exploit this to access sensitive files on the server remotely. This may lead to unauthorized data disclosure, system compromise, or further attacks if combined with other vulnerabilities. The exploit is publicly available, increasing the risk of misuse.

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Compliance Impact

This vulnerability, a path traversal issue in OctoPrint's File Download API, could potentially allow unauthorized access to files on the server. For compliance with standards like GDPR or HIPAA, such unauthorized access risks exposing sensitive data, violating confidentiality requirements and potentially leading to non-compliance if exploited.

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Mitigation Strategies

Upgrade OctoPrint to a patched version if available. If no patch exists, disable the File Download API or restrict access to trusted users only. Monitor network traffic for unusual path traversal attempts in file downloads.

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