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Red Hat Security Advisory 2012-1057-01

Red Hat Security Advisory 2012-1057-01
Posted Jul 6, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-1057-01 - RESTEasy provides various frameworks to help you build RESTful web services and RESTful Java applications. It was found that RESTEasy was vulnerable to XML External Entity attacks. If a remote attacker submitted a request containing an external XML entity to a RESTEasy endpoint, the entity would be resolved, allowing the attacker to read files accessible to the user running the application server. This flaw affected DOM Document and JAXB input.

tags | advisory, java, remote, web, xxe
systems | linux, redhat
advisories | CVE-2012-0818
SHA-256 | 5cfe82490f9e0d9ea42e665a6f4f6f6991026f15dc3ddf2d39550a062b1c56c5

Red Hat Security Advisory 2012-1057-01

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

Synopsis: Moderate: resteasy security update
Advisory ID: RHSA-2012:1057-01
Product: JBoss Enterprise Web Platform
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-1057.html
Issue date: 2012-07-05
CVE Names: CVE-2012-0818
=====================================================================

1. Summary:

An update for JBoss Enterprise Web 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 moderate
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:

RESTEasy provides various frameworks to help you build RESTful web services
and RESTful Java applications.

It was found that RESTEasy was vulnerable to XML External Entity (XXE)
attacks. If a remote attacker submitted a request containing an external
XML entity to a RESTEasy endpoint, the entity would be resolved, allowing
the attacker to read files accessible to the user running the application
server. This flaw affected DOM (Document Object Model) Document and JAXB
(Java Architecture for XML Binding) input. (CVE-2012-0818)

Note: 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.

Warning: Before applying this update, back up your JBoss Enterprise Web
Platform's "jboss-as-web/server/[PROFILE]/deploy/" directory and any other
customized configuration files.

All users of JBoss Enterprise Web Platform 5.1.2 as provided from the Red
Hat Customer Portal are advised to install this update.

3. Solution:

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.

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

785631 - CVE-2012-0818 RESTEasy: XML eXternal Entity (XXE) flaw

5. References:

https://www.redhat.com/security/data/cve/CVE-2012-0818.html
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=enterpriseweb.platform&downloadType=securityPatches&version=5.1.2
https://bugzilla.redhat.com/show_bug.cgi?id=785631

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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