Keycloak DCR RegEx flaw enables unauthorized client registration
CVE-2023-6544 Published on April 25, 2024

Keycloak: authorization bypass
A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized.

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Vulnerability Analysis

CVE-2023-6544 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
LOW
Integrity Impact:
LOW
Availability Impact:
NONE

Timeline

Reported to Red Hat.

Made public. 132 days later.

Weakness Type

Permissive Regular Expression

The product uses a regular expression that does not sufficiently restrict the set of allowed values.


Products Associated with CVE-2023-6544

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Red Hat Keycloak
 
Red Hat Build Keycloak
 
Red Hat Single Sign On
 
Red Hat Rhosemc
 

Exploit Probability

EPSS
1.01%
Percentile
76.95%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.