busykoala fastapi-opa up to 2.0.0 HTTP OPTIONS Request response discrepancy

Summaryinfo

A vulnerability, which was classified as problematic, was found in busykoala fastapi-opa up to 2.0.0. Impacted is an unknown function of the component HTTP OPTIONS Request Handler. The manipulation results in response discrepancy. This vulnerability was named CVE-2024-40627. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in busykoala fastapi-opa up to 2.0.0. It has been classified as problematic. Affected is some unknown functionality of the component HTTP OPTIONS Request Handler. The manipulation with an unknown input leads to a response discrepancy vulnerability. CWE is classifying the issue as CWE-204. The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere. This is going to have an impact on confidentiality. CVE summarizes:

Fastapi OPA is an opensource fastapi middleware which includes auth flow. HTTP `OPTIONS` requests are always allowed by `OpaMiddleware`, even when they lack authentication, and are passed through directly to the application. `OpaMiddleware` allows all HTTP `OPTIONS` requests without evaluating it against any policy. If an application provides different responses to HTTP `OPTIONS` requests based on an entity existing (such as to indicate whether an entity is writable on a system level), an unauthenticated attacker could discover which entities exist within an application. This issue has been addressed in release version 2.0.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.

The advisory is available at github.com. This vulnerability is traded as CVE-2024-40627 since 07/08/2024. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 2.0.1 eliminates this vulnerability.

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Productinfo

Vendor

• busykoala

Name

• fastapi-opa

Version

• 2.0

Website

• Product: https://github.com/busykoala/fastapi-opa/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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