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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2022:0152 advisory.

    Red Hat Single Sign-On 7.5 is a standalone server, based on the Keycloak project, that provides     authentication and standards-based single sign-on capabilities for web and mobile applications.

    This release of Red Hat Single Sign-On 7.5.1 on RHEL 8 serves as a replacement for Red Hat Single Sign-On     7.5.0, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * Keycloak: Incorrect authorization allows unpriviledged users to create other users (CVE-2021-4133)

    * keycloak-server-spi-private: ECP SAML binding bypasses authentication flows (CVE-2021-3827)

    * xml-security: XPath Transform abuse allows for information disclosure (CVE-2021-40690)

    * resteasy: Error message exposes endpoint class information (CVE-2021-20289)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2022:0151 advisory.

    Red Hat Single Sign-On 7.5 is a standalone server, based on the Keycloak project, that provides     authentication and standards-based single sign-on capabilities for web and mobile applications.

    This release of Red Hat Single Sign-On 7.5.1 on RHEL 7 serves as a replacement for Red Hat Single Sign-On     7.5.0, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * Keycloak: Incorrect authorization allows unpriviledged users to create other users (CVE-2021-4133)

    * keycloak-server-spi-private: ECP SAML binding bypasses authentication flows (CVE-2021-3827)

    * xml-security: XPath Transform abuse allows for information disclosure (CVE-2021-40690)

    * resteasy: Error message exposes endpoint class information (CVE-2021-20289)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
156792	RHEL 8 : Red Hat Single Sign-On 7.5.1 security update on RHEL 8 (Important) (RHSA-2022:0152)	Nessus	Red Hat Local Security Checks	high
156788	RHEL 7 : Red Hat Single Sign-On 7.5.1 security update on RHEL 7 (Important) (RHSA-2022:0151)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2021-3827

medium

Tenable Plugins

high

high