CVE-2023-43645: openfga Infinite Loop

Vulnerability summary

CVE-2023-43645 is a medium (CVSS 5.9) Infinite Loop vulnerability in openfga. EPSS estimates a 0.94% chance of exploitation in the next 30 days, higher than 60.2% of scored vulnerabilities.

Timeline

1. 26-09-2023
   PublishedVulnerability first disclosed.
2. 23-09-2024
   Last modifiedVulnerability information updated.

Description

OpenFGA is an authorization/permission engine built for developers and inspired by Google Zanzibar. OpenFGA is vulnerable to a denial of service attack when certain Check calls are executed against authorization models that contain circular relationship definitions. When the call is made, it's possible for the server to exhaust resources and die. Users are advised to upgrade to v1.3.2 and update any offending models. There are no known workarounds for this vulnerability. Note that for models which contained cycles or a relation definition that has the relation itself in its evaluation path, checks and queries that require evaluation will no longer be evaluated on v1.3.2+ and will return errors instead. Users who do not have cyclic models are unaffected.

• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.