Overview OpenFGA v1.8.0 to v1.8.12 ( openfga-0.2.16 <= Helm chart <= openfga-0.2.31, v1.8.0 <= docker <= v.1.8.12) are vulnerable to authorization bypass when certain Check and ListObject calls are executed.

Am I Affected? If you are using OpenFGA v1.8.0 to v1.8.12, specifically under the following conditions, you are affected by this authorization bypass vulnerability: - Calling Check API or ListObjects with an authorization model that has a relationship directly assignable by both type bound public access and userset, and - There are check or list object queries with contextual tuples for the relationship that can be directly assignable by both type bound public access and userset, and - Those contextual tuples’s user field is an userset, and - Type bound public access tuples are not assigned to the relationship

Fix Upgrade to v1.8.13. This upgrade is backwards compatible.

Acknowledgments Okta would like to thank @udyvish for discovering this vulnerability.

Description

In OpenFGA, under specific conditions, BatchCheck calls with multiple checks sent for the same object, relation, and user combination can result in improper policy enforcement.

Am I affected?

You are affected if you meet the following preconditions: 1. You execute BatchCheck operations which rely on context. 2. Multiple checks are sent within a single BatchCheck operation for the same user/object/relation combination, each containing context. 3. The contexts between those checks differ in a specific way

Fix Upgrade to OpenFGA v1.14.0

Acknowledgement OpenFGA would like to thank @bugbunny-research for the discovery and detailed report.