#VU20413 Improper Authentication in Keycloak - CVE-2019-10201

Vulnerability identifier: #VU20413

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-2019-10201

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 the Security Assertion Markup Language (SAML) broker does not properly parse messages. A remote attacker can send a specially crafted SAML request, bypass authentication process and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Keycloak: 0.6.0, 1.0.0.Final - 1.9.8, 2.0.0 - 2.5.4, 3.2.0 - 3.4.3, 4.0 CR1 - 4.8.3, 5.0.0, 6.0.0 - 6.0.1

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10201

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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.