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Keycloak vulnerable to Improper Client Certificate Validation for OAuth/OpenID clients

High severity GitHub Reviewed Published Jun 28, 2023 in keycloak/keycloak • Updated Nov 8, 2023

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 21.1.2

Patched versions

21.1.2

Description

When a Keycloak server is configured to support mTLS authentication for OAuth/OpenID clients, it does not properly verify the client certificate chain. A client that possesses a proper certificate can authorize itself as any other client and therefore access data that belongs to other clients.

References

@abstractj abstractj published to keycloak/keycloak Jun 28, 2023
Published to the GitHub Advisory Database Jun 30, 2023
Reviewed Jun 30, 2023
Published by the National Vulnerability Database Oct 4, 2023
Last updated Nov 8, 2023

Severity

High

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
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
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:L/PR:L/UI:N/S:U/C:H/I:L/A:N

EPSS score

0.156%
(53rd percentile)

Weaknesses

CVE ID

CVE-2023-2422

GHSA ID

GHSA-3qh5-qqj2-c78f

Source code

Credits

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