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

Synopsis:          Important: mod_cluster-native security update
Advisory ID:       RHSA-2012:0038-01
Product:           JBoss Enterprise Application Platform
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-0038.html
Issue date:        2012-01-18
CVE Names:         CVE-2011-4608 
=====================================================================

1. Summary:

An update for the Native components for JBoss Enterprise Application
Platform 5.1.2 that fixes one security issue is now available from the Red
Hat Customer Portal.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Description:

Part of the Native components for JBoss Enterprise Application Platform is
mod_cluster, an Apache HTTP Server (httpd) based load balancer. Like
mod_jk, it uses a communication channel to forward requests from httpd to
an application server node.

It was found that mod_cluster allowed worker nodes to register on any
virtual host (vhost), regardless of the security constraints applied to
other vhosts. In a typical environment, there will be one vhost configured
internally for worker nodes, and another configured externally for serving
content. A remote attacker could use this flaw to register an
attacker-controlled worker node via an external vhost that is not
configured to apply security constraints, then use that worker node to
serve malicious content, intercept credentials, and hijack user sessions.
(CVE-2011-4608)

All users of JBoss Enterprise Application Platform 5.1.2 as provided from
the Red Hat Customer Portal are advised to apply this update. Refer to the
Solution section for installation instructions.

3. Solution:

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

1) Download the update for the Native components for JBoss Enterprise
Application Platform 5.1.2.

2) Copy the Apache HTTP Server modules provided by the update to your
JBoss Enterprise Web Server front-end.

3) Restart the Apache HTTP Server on your JBoss Enterprise Web Server
front-end.

Refer to the "Install proxy server components" section of the HTTP
Connectors Load Balancing Guide for JBoss Enterprise Application
Platform 5, available from docs.redhat.com, for further information.

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

767020 - CVE-2011-4608 mod_cluster: malicious worker nodes can register on any vhost

5. References:

https://www.redhat.com/security/data/cve/CVE-2011-4608.html
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=appplatform&downloadType=securityPatches&version=5.1.2
http://docs.redhat.com/docs/en-US/index.html

6. Contact:

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

Copyright 2012 Red Hat, Inc.
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