Source: fastapi X-Debbugs-CC: t...@security.debian.org Severity: important Tags: security
Hi, The following vulnerability was published for fastapi. CVE-2021-32677[0]: | FastAPI is a web framework for building APIs with Python 3.6+ based on | standard Python type hints. FastAPI versions lower than 0.65.2 that | used cookies for authentication in path operations that received JSON | payloads sent by browsers were vulnerable to a Cross-Site Request | Forgery (CSRF) attack. In versions lower than 0.65.2, 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. This is fixed in FastAPI 0.65.2. The request | data is now parsed as JSON only if the content-type header is | application/json or another JSON compatible media type like | application/geo+json. It's best to upgrade to the latest FastAPI, but | if updating is not possible then a middleware or a dependency that | checks the content-type header and aborts the request if it is not | application/json or another JSON compatible content type can act as a | mitigating workaround. Advisory: https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7 Patch: https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d (0.65.2) If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2021-32677 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32677 Please adjust the affected versions in the BTS as needed.
