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Cross-site Request Forgery (CSRF) Affecting fastapi package, versions [,0.65.2)

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required

    Threat Intelligence

    EPSS 0.09% (37th percentile)
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NVD
8.1 high

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  • Snyk ID SNYK-PYTHON-FASTAPI-1303092
  • published 10 Jun 2021
  • disclosed 10 Jun 2021
  • credit Unknown
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Introduced: 10 Jun 2021

CVE-2021-32677 Open this link in a new tab
CWE-352 Open this link in a new tab

How to fix?

Upgrade fastapi to version 0.65.2 or higher.

Overview

fastapi is a web framework for building APIs with Python 3.6+ based on standard Python type hints.

Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF). FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application.