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

Quick assessment

Affected
openfga openfga
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenFGA是OpenFGA的为开发人员构建并受 Google Zanzibar 启发的高性能和灵活的授权/许可引擎。 OpenFGA 1.3.1之前版本存在安全漏洞，该漏洞源于当针对包含循环关系定义的授权模型执行某些 Check 调用时，OpenFGA 很容易受到拒绝服务攻击。

CVSS 5.9 · Medium EPSS 0.75% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-43645

Vulnerability Information
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Vulnerability Title
Denial of service from circular relationship definitions in OpenFGA
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenFGA 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenFGA是OpenFGA的为开发人员构建并受 Google Zanzibar 启发的高性能和灵活的授权/许可引擎。 OpenFGA 1.3.1之前版本存在安全漏洞，该漏洞源于当针对包含循环关系定义的授权模型执行某些 Check 调用时，OpenFGA 很容易受到拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openfga openfga < 1.3.2 -

II. Public POCs for CVE-2023-43645

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III. Intelligence Information for CVE-2023-43645

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Patches & Fixes for CVE-2023-43645 (1)

Vendor Advisories for CVE-2023-43645 (1)

IV. Related Vulnerabilities

Same product: openfga
Same vendor: openfga
Same weakness: CWE-835

V. Comments for CVE-2023-43645

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