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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 <[email protected]>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
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