#VU54555 Cross-site request forgery in FastAPI - CVE-2021-32677

Vulnerability identifier: #VU54555

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-32677

CWE-ID: CWE-352

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FastAPI
Web applications / CMS

Vendor: FastAPI Project

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website, such as act as a mitigating workaround.

Mitigation
Install update from vendor's website.

Vulnerable software versions

FastAPI: 0.1.11 - 0.65.1

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External links
https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d
https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MATAWX25TYKNEKLDMKWNLYDB34UWTROA/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.