ECP SAML binding bypasses authentication flows

中 6.8CVE-2021-3827 · GHSA-4pc7-vqv5-5r3v · 23/08/2022 公開 · 17/06/2026 更新

要点

CVE-2021-3827 は org.keycloak:keycloak-saml-core, keycloak (redhat), openshift container platform (redhat) に影響する深刻度「中」 (CVSS 6.8) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.1%（全脆弱性の 65.9% より高い）。
対処：18.0.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
org.keycloak:keycloak-saml-core Maven	`< 18.0.0`	`18.0.0`
keycloak redhat	`< 18.0.0`	`18.0.0`
openshift container platform redhat	`= 4.8= 4.9`	修正版なし
single sign-on redhat	`= 7.0= 7.5.0`	修正版なし

概要

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.

NVD の説明

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.