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Category:   Application (Security)  >   Red Hat Single Sign-On Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Single Sign-On) JBoss Authentication Flaw in JGroups Lets Remote Users Bypass Security Restrictions on the Target System
SecurityTracker Alert ID:  1036409
SecurityTracker URL:  http://securitytracker.com/id/1036409
CVE Reference:   CVE-2016-2141   (Links to External Site)
Date:  Jul 20 2016
Impact:   Disclosure of system information, Host/resource access via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in JBoss. A remote user can bypass security controls on the target system. Red Hat Single Sign-On is affected.

JGroups does not properly authenticate new nodes joining the cluster. A remote user can bypass security controls on the target system to send and receive messages within the cluster, obtain potentially sensitive information, or spoof messages.

Red Hat JBoss Enterprise Application Platform and Red Hat JBoss Data Grid are affected.

Dennis Reed (Red Hat) reported this vulnerability.

Impact:   A remote user can bypass security controls on the target system.
Solution:   Red Hat has issued a fix for Red Hat Single Sign-On.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-1439.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-1439.html (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Jun 24 2016 JBoss Authentication Flaw in JGroups Lets Remote Users Bypass Security Restrictions on the Target System



 Source Message Contents

Subject:  [RHSA-2016:1439-01] Critical: Red Hat Single Sign-On security update

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

Synopsis:          Critical: Red Hat Single Sign-On security update
Advisory ID:       RHSA-2016:1439-01
Product:           Red Hat Single Sign-On
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-1439.html
Issue date:        2016-07-19
Updated on:        2016-07-20
CVE Names:         CVE-2016-2141 
=====================================================================

1. Summary:

A security update is now available for Red Hat Single Sign-On 7.0 from the
Customer Portal.

Red Hat Product Security has rated this update as having a security impact
of Critical. 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 7.0 is a standalone server, based on the Keycloak
project, that provides authentication and standards-based SSO capabilities
for web and mobile applications.

This asynchronous patch is a security update for JGroups package in Red Hat
Single Sign-On 7.0. More information about this vulnerability is available
at: https://access.redhat.com/articles/2360521

Security Fix(es):

* It was found that JGroups did not require necessary headers for encrypt
and auth protocols from new nodes joining the cluster. An attacker could
use this flaw to bypass security restrictions, and use this vulnerability
to send and receive messages within the cluster, leading to information
disclosure, message spoofing, or further possible attacks. (CVE-2016-2141)

The CVE-2016-2141 issue was discovered by Dennis Reed (Red Hat).

3. Solution:

The References section of this erratum contains a download link (you must
log in to download the update). Before applying this update, back up your
existing Red Hat Single Sign-On installation.

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

1313589 - CVE-2016-2141 Authorization bypass in JGroups

5. References:

https://access.redhat.com/security/cve/CVE-2016-2141
https://access.redhat.com/security/updates/classification/#critical
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=core.service.rhsso&downloadType=securityPatches&version=7.0
https://access.redhat.com/articles/2360521

6. Contact:

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

Copyright 2016 Red Hat, Inc.
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