A flaw was found in Keycloak. A Keycloak server configured to support mTLS authentication for OAuth/OpenID clients does not properly verify the client certificate chain. A client that possesses a proper certificate can authorize itself as any other client, therefore, access data that belongs to other clients.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2023:3884 advisory.

    Red Hat Single Sign-On 7.6 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 7.6.4 on RHEL 8 serves as a replacement for Red Hat Single Sign-On     7.6.3, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * keycloak: Cross-site scripting when validating URI-schemes on SAML and OIDC (CVE-2022-4361)

    * undertow: Infinite loop in SslConduit during close (CVE-2023-1108)

    * keycloak: oauth client impersonation (CVE-2023-2422)

    * keycloak: Untrusted Certificate Validation (CVE-2023-1664)

    * keycloak: client access via device auth request spoof (CVE-2023-2585)

    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 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-2023:3883 advisory.

    Red Hat Single Sign-On 7.6 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 7.6.4 on RHEL 7 serves as a replacement for Red Hat Single Sign-On     7.6.3, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * keycloak: Cross-site scripting when validating URI-schemes on SAML and OIDC (CVE-2022-4361)

    * undertow: Infinite loop in SslConduit during close (CVE-2023-1108)

    * keycloak: oauth client impersonation (CVE-2023-2422)

    * keycloak: Untrusted Certificate Validation (CVE-2023-1664)

    * keycloak: client access via device auth request spoof (CVE-2023-2585)

    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 these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2023:3885 advisory.

    Red Hat Single Sign-On 7.6 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 7.6.4 on RHEL 9 serves as a replacement for Red Hat Single Sign-On     7.6.3, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * keycloak: Cross-site scripting when validating URI-schemes on SAML and OIDC (CVE-2022-4361)

    * undertow: Infinite loop in SslConduit during close (CVE-2023-1108)

    * keycloak: oauth client impersonation (CVE-2023-2422)

    * keycloak: Untrusted Certificate Validation (CVE-2023-1664)

    * keycloak: client access via device auth request spoof (CVE-2023-2585)

    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 these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
177672	RHEL 8 : Red Hat Single Sign-On 7.6.4 security update on RHEL 8 (Important) (RHSA-2023:3884)	Nessus	Red Hat Local Security Checks	high
177671	RHEL 7 : Red Hat Single Sign-On 7.6.4 security update on RHEL 7 (Important) (RHSA-2023:3883)	Nessus	Red Hat Local Security Checks	high
177670	RHEL 9 : Red Hat Single Sign-On 7.6.4 security update on RHEL 9 (Important) (RHSA-2023:3885)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2023-2422

high

Tenable Plugins

high

high

high