Denial of service from circular relationship definitions in OpenFGA
CVE-2023-43645

5.9MEDIUM

Key Information:

Vendor

Openfga

Status
Openfga
Vendor
CVE Published:
27 September 2023

What is CVE-2023-43645?

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.

Affected Version(s)

openfga < 1.3.2

References

https://github.com/openfga/openfga/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/openfga/openfga/commit/725296025fd8122...
x_refsource_MISC

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.