A flaw was found in keycloak as shipped in Red Hat Single Sign-On 7.4 where IDN homograph attacks are possible. A malicious user can register himself with a name already registered and trick admin to grant him extra privileges.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:2065 advisory.

    Red Hat Single Sign-On 7.4 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 7.4.7 serves as a replacement for Red Hat Single Sign-On 7.4.6, and     includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the     References.

    Security Fix(es):

    * keycloak: Backchannel logout not working when Principal Type is set to Attribute Name for external SAML     IDP (CVE-2021-3461)

    * keycloak: Internationalized domain name (IDN) homograph attack to impersonate users (CVE-2021-3424)

    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 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:2063 advisory.

    Red Hat Single Sign-On 7.4 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 7.4.7 serves as a replacement for Red Hat Single Sign-On 7.4.6, and     includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the     References.

    Security Fix(es):

    * keycloak: Backchannel logout not working when Principal Type is set to Attribute Name for external SAML     IDP (CVE-2021-3461)

    * keycloak: Internationalized domain name (IDN) homograph attack to impersonate users (CVE-2021-3424)

    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-2021:2064 advisory.

    Red Hat Single Sign-On 7.4 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 7.4.7 serves as a replacement for Red Hat Single Sign-On 7.4.6, and     includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the     References.

    Security Fix(es):

    * keycloak: Backchannel logout not working when Principal Type is set to Attribute Name for external SAML     IDP (CVE-2021-3461)

    * keycloak: Internationalized domain name (IDN) homograph attack to impersonate users (CVE-2021-3424)

    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
149835	RHEL 8 : Red Hat Single Sign-On 7.4.7 security update on RHEL 8 (Moderate) (RHSA-2021:2065)	Nessus	Red Hat Local Security Checks	high
149817	RHEL 6 : Red Hat Single Sign-On 7.4.7 security update on RHEL 6 (Moderate) (RHSA-2021:2063)	Nessus	Red Hat Local Security Checks	high
149815	RHEL 7 : Red Hat Single Sign-On 7.4.7 security update on RHEL 7 (Moderate) (RHSA-2021:2064)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2021-3424

medium

Tenable Plugins

high

high

high