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Improper Authorization in Keycloak

High severity GitHub Reviewed Published Dec 20, 2021 in keycloak/keycloak • Updated Feb 3, 2023

Package

maven org.keycloak:keycloak-services (Maven)

Affected versions

< 15.1.1

Patched versions

15.1.1

Description

A incorrect authorization flaw was found in Keycloak 12.0.0, the flaw allows an attacker with any existing user account to create new default user accounts via the administrative REST API even where new user registration is disabled.

References

@stianst stianst published to keycloak/keycloak Dec 20, 2021
Reviewed Jan 4, 2022
Published to the GitHub Advisory Database Jan 6, 2022
Published by the National Vulnerability Database Jan 25, 2022
Last updated Feb 3, 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
High
Availability
High

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:H/A:H

EPSS score

0.476%
(76th percentile)

Weaknesses

CVE ID

CVE-2021-4133

GHSA ID

GHSA-83x4-9cwr-5487

Source code

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