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OpenFGA Authorization Bypass

Moderate severity GitHub Reviewed Published Nov 7, 2022 in openfga/openfga • Updated Apr 14, 2023

Package

gomod github.com/openfga/openfga (Go)

Affected versions

<= 0.2.4

Patched versions

0.2.5

Description

Overview

During our internal security assessment, it was discovered that OpenFGA versions v0.2.4 and prior are vulnerable to authorization bypass under certain conditions.

Am I Affected?

You are affected by this vulnerability if you are using openfga/openfga version v0.2.4 or prior, and have tuples where the user field is set to a userset e.g. folder:test#owner, and the tuple's relation is used on the right-hand side of a from statement.

How to fix that?

Upgrade to version 0.2.5.

Backward Compatibility

This update is not backward compatible.
Any tuples where the user field is set to a userset, and the tuple's relation is used on the right-hand side of a from statement have to be rewritten.

References

@SamyGhannad SamyGhannad published to openfga/openfga Nov 7, 2022
Published by the National Vulnerability Database Nov 8, 2022
Published to the GitHub Advisory Database Nov 8, 2022
Reviewed Nov 8, 2022
Last updated Apr 14, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(49th percentile)

Weaknesses

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Learn more on MITRE.

CVE ID

CVE-2022-39352

GHSA ID

GHSA-3gfj-fxx4-f22w

Source code

Credits

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