#VU100910 Improper Authentication in Keycloak - CVE-2024-10039

Vulnerability identifier: #VU100910

Vulnerability risk: High

CVSSv4.0: 6.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2024-10039

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

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

Vendor: Keycloak

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in the authentication process in the Keycloak deployments with a reverse proxy not using pass-through termination of TLS and with enabled mTLS. A remote attacker can authenticate as any user or client that leverages mTLS as the authentication mechanism.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Keycloak: 20.0.0 - 26.0.5

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External links
https://github.com/keycloak/keycloak/security/advisories/GHSA-93ww-43rr-79v3
https://bugzilla.redhat.com/show_bug.cgi?id=2319217

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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.