Executive Summary

This vulnerability affects the Emmett full-stack Python web framework versions from 2.5.0 up to but not including 2.8.1. It involves the RSGI static handler responsible for serving Emmett's internal assets located under the /__emmett__ paths. The handler is vulnerable to path traversal attacks, which means an attacker can manipulate the URL by including sequences like ../ to access files outside the intended assets directory. For example, an attacker could request /__emmett__/../rsgi/handlers.py to read arbitrary files on the server.

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Impact Analysis

This vulnerability can have serious impacts because it allows an attacker to read arbitrary files on the server hosting the Emmett application. This could lead to exposure of sensitive information such as configuration files, source code, credentials, or other private data. The CVSS score of 9.1 indicates a high severity, with the potential for complete confidentiality loss and partial availability impact, meaning the attacker can access sensitive data without any privileges or user interaction.

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Mitigation Strategies

To mitigate this vulnerability, upgrade Emmett to version 2.8.1 or later, where the path traversal issue in the RSGI static handler has been fixed.

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