IoTSharp BlobStorageController Path Traversal Vulnerability

Executive Summary

This vulnerability is in IoTSharp's BlobStorageController.cs where the [Authorize] attribute is missing on its endpoints. Other controllers like DevicesController have this attribute, but BlobStorageController does not. Additionally, there is no global authorization fallback policy configured in Startup.cs. This leaves the Upload, Download, List, Modify, and Delete endpoints accessible to unauthenticated remote attackers.

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Detection Guidance

Check if the BlobStorageController.cs endpoints are accessible without authentication by sending requests to Upload/Download/List/Modify/Delete endpoints. Test for path traversal by using sequences like ../ in path/filename parameters to attempt accessing files outside the intended directory.

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Impact Analysis

Unauthenticated attackers can exploit this to perform path traversal attacks. They can write, read, modify, or delete arbitrary files outside the intended blob storage directory. If web-accessible paths are targeted, attackers could upload webshells to achieve remote code execution on the server.

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Compliance Impact

This vulnerability could lead to unauthorized access and modification of sensitive data, violating confidentiality and integrity requirements in GDPR and HIPAA. Unauthorized file access may result in data breaches, triggering regulatory fines and compliance violations.

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Mitigation Strategies

Apply the [Authorize] attribute to BlobStorageController.cs and configure a global authorization FallbackPolicy in Startup.cs. Sanitize path/filename parameters to prevent path traversal. Restrict file uploads to specific directories and validate file types.

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