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.
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Library home page: https://files.pythonhosted.org/packages/52/78/0289b14c64d819ad49ef28c8453a3906ef6a19b0f1d977f0334066c01681/fastapi-0.33.0-py3-none-any.whl
Path to dependency file: /requirements.txt
Path to vulnerable library: /requirements.txt
Vulnerabilities
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2021-32677
### Vulnerable Library - fastapi-0.33.0-py3-none-any.whlFastAPI framework, high performance, easy to learn, fast to code, ready for production
Library home page: https://files.pythonhosted.org/packages/52/78/0289b14c64d819ad49ef28c8453a3906ef6a19b0f1d977f0334066c01681/fastapi-0.33.0-py3-none-any.whl
Path to dependency file: /requirements.txt
Path to vulnerable library: /requirements.txt
Dependency Hierarchy: - :x: **fastapi-0.33.0-py3-none-any.whl** (Vulnerable Library)
Found in base branch: main
### Vulnerability DetailsFastAPI 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.
Publish Date: 2021-06-09
URL: CVE-2021-32677
### CVSS 3 Score Details (8.2)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: Low - Integrity Impact: High - Availability Impact: None
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7
Release Date: 2021-06-09
Fix Resolution: 0.65.2
:rescue_worker_helmet: Automatic Remediation will be attempted for this issue.:rescue_worker_helmet:Automatic Remediation will be attempted for this issue.