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Keycloak Authorization Bypass vulnerability

Moderate severity GitHub Reviewed Published Apr 17, 2024 in keycloak/keycloak • Updated Apr 25, 2024

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 22.0.10
>= 23.0.0, < 24.0.3

Patched versions

22.0.10
24.0.3

Description

Due to a permissive regular expression hardcoded for filtering allowed hosts to register a dynamic client, a malicious user with enough information about the environment could benefit and jeopardize an environment with this specific Dynamic Client Registration with TrustedDomain configuration previously unauthorized.

Acknowledgements:

Special thanks to Bastian Kanbach for reporting this issue and helping us improve our security.

References

@abstractj abstractj published to keycloak/keycloak Apr 17, 2024
Published to the GitHub Advisory Database Apr 17, 2024
Reviewed Apr 17, 2024
Published by the National Vulnerability Database Apr 25, 2024
Last updated Apr 25, 2024

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
Low
Privileges required
Low
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:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS score

0.044%
(15th percentile)

Weaknesses

CVE ID

CVE-2023-6544

GHSA ID

GHSA-46c8-635v-68r2

Source code

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