(RHSA-2011:0949) 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 release of JBoss Enterprise Application Platform 5.1.1 serves as a
replacement to JBoss Enterprise Application Platform 5.1.0. It includes
various bug fixes which are detailed in the Release Notes. The Release
Notes will be available shortly from the link in the References section.

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)

If you have created custom applications that are packaged with a copy of
the JBoss Seam 2 library, those applications must be rebuilt with the
updated jboss-seam.jar file provided by this update.

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 as provided from
the Red Hat Customer Portal are advised to upgrade to JBoss Enterprise
Application Platform 5.1.1.