#VU59083 Improper access control in Keycloak - CVE-2021-4133

Vulnerability identifier: #VU59083

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-4133

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Keycloak
Server applications / Directory software, identity management

Vendor: Keycloak

Description

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions within the administrative REST API. A remote user can bypass implemented security restrictions and create new default user accounts, even when new user registration is disabled.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Keycloak: 12.0.0 - 15.1.0

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2033602

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.