Vulnerability identifier: #VU93088

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-4540

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

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

Vendor: Keycloak

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to an error in the OAuth 2.0 Pushed Authorization Requests (PAR) implementation. Client provided parameters are included in plain text in to the KC_RESTART cookie returned by the authorization server's HTTP response to a request_uri authorization request. A local user with access to the system can use the cookie to gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Keycloak: 24.0.0 - 24.0.4

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External links
http://bugzilla.redhat.com/show_bug.cgi?id=2279303
http://github.com/keycloak/keycloak/security/advisories/GHSA-69fp-7c8p-crjr

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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