Path Traversal in Flextype CMS

Executive Summary

Flextype CMS through 1.0.0-alpha.3 has a path traversal flaw in its Entries REST API. The vulnerability occurs because the id and new_id parameters are not properly validated, allowing API token holders to read, create, or overwrite files outside the entries directory. Attackers can use directory traversal sequences like ../ to escape the project entries directory and manipulate arbitrary files on the filesystem.

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Detection Guidance

To detect this vulnerability, monitor API requests to the Flextype Entries REST API for unusual parameters containing traversal sequences like '../'. Check server logs for file operations outside the entries directory. Use tools like curl to test if the API allows path traversal by sending requests with manipulated id or new_id values.

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Impact Analysis

If you are an API token holder, an attacker could exploit this to read sensitive files, overwrite critical system files, or create malicious files anywhere on the server. This could lead to data breaches, system compromise, or denial of service. Even without direct access, if the CMS is exposed to untrusted networks, attackers could gain control over the server.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements. It may result in data breaches exposing personal or health information, leading to legal penalties, fines, and reputational damage for organizations handling regulated data.

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Mitigation Strategies

Immediately upgrade Flextype CMS to a patched version beyond 1.0.0-alpha.3. If upgrading is not possible, restrict API token access and disable the Entries REST API if unused. Implement strict input validation for id and new_id parameters to prevent path traversal sequences.

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