CVE-2024-40627

OpaMiddleware does not filter HTTP OPTIONS requests

Published Jul 15, 2024 CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed
Description
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.

Analysis

No analysis available yet

Remediation

No remediation available yet

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-2263 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.
Github GHSA Github GHSA GHSA-5f5c-8rvc-j8wf OpaMiddleware does not filter HTTP OPTIONS requests
History

No history.

Weaknesses
  • CWE-204

    Observable Response Discrepancy

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 2, 2024, 4:33 AM
Reserved
Jul 8, 2024, 4:13 PM
Status
Deferred
Published
Jul 15, 2024, 8:15 PM
Modified
Jun 17, 2026, 7:46 AM