#VU97468 Improper Restriction of Excessive Authentication Attempts in Keycloak - CVE-2024-4629

Vulnerability identifier: #VU97468

Vulnerability risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-4629

CWE-ID: CWE-307

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 perform a brute-force attack.

The vulnerability exists due to an error when handling unsuccessful login attempts. A remote attacker can initiate multiple login requests simultaneously and bypass the configured limits for failed attempts before the system locks them out.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Keycloak: 19.0.0 - 19.0.3, 20.0.0 - 25.0.3

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2276761
https://github.com/keycloak/keycloak/security/advisories/GHSA-gc7q-jgjv-vjr2

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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