Detection Guidance

This vulnerability can be detected by monitoring for crafted GET requests that include path traversal segments such as "../" targeting sibling directories with similar prefixes to the intended library directory.

For example, you can inspect web server logs or network traffic for requests matching patterns like:

• GET /taipy-extension/<library_name>/../<prefix_matching_sibling>/<file>

Commands to detect such attempts could include using grep or similar tools on access logs to find suspicious traversal patterns:

• grep -E "GET .*\.\./" /path/to/access.log
• tcpdump or Wireshark filters to capture HTTP GET requests containing "../" sequences.

Additionally, checking for unauthorized file access outside the intended directories by reviewing application logs or filesystem access logs may help detect exploitation attempts.

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Executive Summary

This vulnerability exists in Taipy version 4.1.1 within the ElementLibrary.get_resource() method. It is a path traversal flaw that allows unauthenticated attackers to access files outside the intended module directory. The issue arises because the method uses an incomplete path containment check with str.startswith() that does not consider a trailing path separator. Attackers can craft GET requests containing path traversal segments that target sibling directories on disk. Due to how Flask's path converter and Werkzeug's WSGI layer preserve these traversal segments, the flawed startswith check is bypassed, enabling unauthorized file access beyond the library directory.

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Impact Analysis

This vulnerability can lead to unauthorized access to files outside the intended directory, potentially exposing sensitive information or configuration files. Since the attack requires no authentication, it poses a high risk of data leakage or information disclosure. The CVSS v3.1 score of 7.5 indicates a high severity impact on confidentiality without affecting integrity or availability.

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Mitigation Strategies

The immediate mitigation step is to update Taipy to a version that includes the fix for this vulnerability, specifically versions where the commit 129fd40 has been applied (e.g., 4.1.1 patched or later).

The fix replaces the insecure string prefix check with a proper path containment check using Python's Path.is_relative_to() method, preventing path traversal attacks.

Until the update can be applied, consider implementing network-level protections such as blocking suspicious requests containing path traversal sequences (e.g., "../") via web application firewalls or reverse proxies.

Also, review and restrict file system permissions to limit access to sensitive directories that could be targeted by such traversal attempts.

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Compliance Impact

The vulnerability allows unauthenticated attackers to perform path traversal and access unauthorized files outside the intended directory. This unauthorized file access could potentially lead to exposure of sensitive or personal data.

Such unauthorized access and potential data exposure may impact compliance with data protection regulations and standards like GDPR and HIPAA, which require strict controls on access to sensitive information and protection against unauthorized disclosure.

However, the provided information does not specify exact compliance impacts or whether any regulated data is affected.

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