CVE-2021-32677

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-32677
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-09 18:15:00 UTC
Updated2023-11-07 03:35:00 UTC
DescriptionFastAPI 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.

Risk And Classification

Problem Types: CWE-352

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Fastapi Project Fastapi All All All All
Operating System Fedoraproject Fedora 34 All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 34 Update: python-fastapi-0.65.2-1.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
Cross-Site Request Forgery (CSRF) in FastAPI · Advisory · tiangolo/fastapi · GitHub CONFIRM github.com
[SECURITY] Fedora 34 Update: python-fastapi-0.65.2-1.fc34 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
???? Check Content-Type request header before assuming JSON (#2118) · tiangolo/fastapi@fa7e3c9 · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 183179 Debian Security Update for fastapi (CVE-2021-32677)
  • 281643 Fedora Security Update for python (FEDORA-2021-917e89c036)
  • 982084 Python (pip) Security Update for fastapi (GHSA-8h2j-cgx8-6xv7)

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