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====================================================================                   
Red Hat Security Advisory

Synopsis:          Moderate: Red Hat Single Sign-On 7.4.7 security update
Advisory ID:       RHSA-2021:2070-01
Product:           Red Hat Single Sign-On
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:2070
Issue date:        2021-05-20
CVE Names:         CVE-2021-3424 CVE-2021-3461 CVE-2021-21290
                   CVE-2021-21295
====================================================================
1. Summary:

A security update is now available for Red Hat Single Sign-On 7.4 from the
Customer Portal.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Description:

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):

* netty: Information disclosure via the local system temporary directory
(CVE-2021-21290)

* netty: possible request smuggling in HTTP/2 due missing validation
(CVE-2021-21295)

* 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.

3. Solution:

Before applying the update, back up your existing installation, including
all applications, configuration files, databases and database settings, and
so on.

The References section of this erratum contains a download link (you must
log in to download the update).

4. Bugs fixed (https://bugzilla.redhat.com/):

1927028 - CVE-2021-21290 netty: Information disclosure via the local system temporary directory
1933320 - CVE-2021-3424 keycloak: Internationalized domain name (IDN) homograph attack to impersonate users
1937364 - CVE-2021-21295 netty: possible request smuggling in HTTP/2 due missing validation
1941565 - CVE-2021-3461 keycloak: Backchannel logout not working when Principal Type is set to Attribute Name for external SAML IDP

5. References:

https://access.redhat.com/security/cve/CVE-2021-3424
https://access.redhat.com/security/cve/CVE-2021-3461
https://access.redhat.com/security/cve/CVE-2021-21290
https://access.redhat.com/security/cve/CVE-2021-21295
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=core.service.rhsso&downloadType=securityPatches&version=7.4
https://access.redhat.com/documentation/en-us/red_hat_single_sign-on/7.4/

6. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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