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ECP SAML binding bypasses authentication flows

Moderate
abstractj published GHSA-4pc7-vqv5-5r3v Apr 25, 2022

Package

maven org.keycloak.protocol.saml (Maven)

Affected versions

< 18.0.0

Patched versions

18.0.0

Description

Description

A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.

Severity

Moderate

CVE ID

CVE-2021-3827

Weaknesses