A flaw was found in Keycloak in versions from 12.0.0 and before 15.1.1 which allows an attacker with any existing user account to create new default user accounts via the administrative REST API even when new user registration is disabled.

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:5219 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 is an asynchronous patch for Red Hat Single Sign-On 7.5, and includes one security fix.

    Security Fix:

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

    For more details about the security issue(s), including the impact, a CVSS score, 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 this issue 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 a vulnerability as referenced in the RHSA-2021:5218 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 is an asynchronous patch for Red Hat Single Sign-On 7.5, and includes one security fix.

    Security Fix:

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

    For more details about the security issue(s), including the impact, a CVSS score, 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 this issue 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
156225	RHEL 8 : Red Hat Single Sign-On security update on RHEL 8 (Important) (RHSA-2021:5219)	Nessus	Red Hat Local Security Checks	high
156202	RHEL 7 : Red Hat Single Sign-On 7.5.0 security update on RHEL 7 (Important) (RHSA-2021:5218)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2021-4133

high

Tenable Plugins

high

high

high

high