XML eXternal Entity (XXE) flaw
CVE: CVE-2012-0818
Component: RESTEasy
CWE: CWE-611
Severity: Moderate
Release date: 2012-01-01T00:00:00+00:00

RESTEasy before 2.3.1 allows remote attackers to read arbitrary files via an external entity reference in a DOM document, aka an XML external entity (XXE) injection attack.


Remediation:
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Follow the upgrade
procedure in the Red Hat Enterprise Virtualization
Installation Guide to install these updated packages:

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Virtualization/3.0/html/Installation_Guide/chap-Installation_Guide-Installing_the_RHEV_Manager-Upgrades.html
Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258
The References section of this erratum contains a download link (you must
log in to download the update). Before applying the update, back up your
existing JBoss Enterprise BRMS Platform installation (including its
databases, applications, configuration files, and so on).

Note that it is recommended to halt the JBoss Enterprise BRMS Platform
server by stopping the JBoss Application Server process before installing
this update, and then after installing the update, restart the JBoss
Enterprise BRMS Platform server by starting the JBoss Application Server
process.
The References section of this erratum contains download links (you must
log in to download the updates). Before applying the update, back up your
existing installation, including all applications, configuration files,
databases and database settings, and so on.

It is recommended to halt the server by stopping the JBoss Application
Server process before installing this update, and then after installing the
update, restart the server by starting the JBoss Application Server process.

The fix for CVE-2013-6468 enables the Java Security Manager (JSM) to
sandbox the evaluation of MVEL expressions. This introduces performance
degradation in high load environments. The following ways of running Red
Hat JBoss BPM Suite are considered secure while mitigating performance
degradation:

1. In high load environments where performance is critical, it is
recommended to only deploy applications that have been developed on other
systems and properly reviewed. It is also recommended not to create any
users with the Analyst role on such systems. If these safeguards are
followed, it is safe to leave JSM disabled on these systems so it does not
introduce any performance degradation.

2. In testing and development environments without high loads, or in
environments where rule authoring is exposed to external networks, it is
recommended to have JSM enabled in order to achieve security benefits of
properly sandboxed evaluation of MVEL expressions.

Allowing users with the Analyst role to log in to the Business Central
console when JSM is disabled is not secure and not recommended.
The References section of this erratum contains download links (you must
log in to download the updates). Before applying the update, back up your
existing installation, including all applications, configuration files,
databases and database settings, and so on.

It is recommended to halt the server by stopping the JBoss Application
Server process before installing this update, and then after installing the
update, restart the server by starting the JBoss Application Server process.

The fix for CVE-2013-6468 enables the Java Security Manager (JSM) to
sandbox the evaluation of MVEL expressions. This introduces performance
degradation in high load environments. The following ways of running Red
Hat JBoss BRMS are considered secure while mitigating performance
degradation:

1. In high load environments where performance is critical, it is
recommended to only deploy applications that have been developed on other
systems and properly reviewed. It is also recommended not to create any
users with the Analyst role on such systems. If these safeguards are
followed, it is safe to leave JSM disabled on these systems so it does not
introduce any performance degradation.

2. In testing and development environments without high loads, or in
environments where rule authoring is exposed to external networks, it is
recommended to have JSM enabled in order to achieve security benefits of
properly sandboxed evaluation of MVEL expressions.

Allowing users with the Analyst role to log in to the Business Central
console when JSM is disabled is not secure and not recommended.
The References section of this erratum contains a download link (you must
log in to download the update).

The JBoss server process must be restarted for this update to take effect.
The References section of this erratum contains a download link (you must
log in to download the update). Before applying the update, back up all
applications deployed on JBoss Enterprise Portal Platform, along with all
customized configuration files.
All users of JBoss Enterprise SOA Platform 5.2.0 as provided from the Red
Hat Customer Portal are advised to upgrade to JBoss Enterprise SOA Platform
5.3.0.

The References section of this erratum contains a download link (you must
log in to download the new version). Before installing version 5.3.0, back
up your existing JBoss Enterprise SOA Platform installation (including its
databases, applications, configuration files, and so on).

The fix for CVE-2012-0818 is not enabled by default. This update adds a new
configuration option to disable entity expansion in RESTEasy. If
applications on your server expose RESTEasy XML endpoints, a
resteasy.document.expand.entity.references configuration snippet must be
added to their web.xml file to disable entity expansion in RESTEasy. Refer
to Red Hat Bugzilla bug 785631 for details.
The References section of this erratum contains a download link (you must
log in to download the update).

The JBoss server process must be restarted for this update to take effect.