(RHSA-2011:0948) Important: JBoss Enterprise Application Platform 5.1.1 update

JBoss Enterprise Application Platform is the market-leading platform for
innovative and scalable Java applications. JBoss Enterprise Application
Platform integrates the JBoss Application Server with JBoss Hibernate and
JBoss Seam into a complete and simple enterprise solution.

This JBoss Enterprise Application Platform 5.1.1 release for Red Hat
Enterprise Linux 5 serves as a replacement for JBoss Enterprise Application
Platform 5.1.0.

These updated packages include the bug fixes detailed in the release notes,
which are linked to from the References section of this erratum.

The following security issue is also fixed with this release:

It was found that the fix for CVE-2011-1484 was incomplete: JBoss Seam 2
did not block access to all malicious JBoss Expression Language (EL)
constructs in page exception handling, allowing arbitrary Java methods to
be executed. A remote attacker could use this flaw to execute arbitrary
code via a specially-crafted URL provided to certain applications based on
the JBoss Seam 2 framework. Note: A properly configured and enabled Java
Security Manager would prevent exploitation of this flaw. (CVE-2011-2196)

Red Hat would like to thank the ObjectWorks+ Development Team at Nomura
Research Institute for reporting this issue.

Warning: Before applying this update, please back up your JBoss Enterprise
Application Platform’s “jboss-as/server/[PROFILE]/deploy/” directory, along
with all other customized configuration files.

All users of JBoss Enterprise Application Platform 5.1.0 on Red Hat
Enterprise Linux 5 are advised to upgrade to these updated packages. Manual
action is required for this update to take effect. Refer to the Solution
section for details.