RHSA-2014:0842 - Security Advisory

Topic

An update for Red Hat JBoss Enterprise Application Platform 6.2.4 that
fixes multiple security issues is now available from the Red Hat Customer
Portal.

The Red Hat Security Response Team has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

Description

Red Hat JBoss Enterprise Application Platform 6 is a platform for Java
applications based on JBoss Application Server 7.

It was discovered that JBoss Web did not limit the length of chunk sizes
when using chunked transfer encoding. A remote attacker could use this flaw
to perform a denial of service attack against JBoss Web by streaming an
unlimited quantity of data, leading to excessive consumption of server
resources. (CVE-2014-0075)

It was found that JBoss Web did not check for overflowing values when
parsing request content length headers. A remote attacker could use this
flaw to perform an HTTP request smuggling attack on a JBoss Web server
located behind a reverse proxy that processed the content length header
correctly. (CVE-2014-0099)

It was found that the org.apache.catalina.servlets.DefaultServlet
implementation in JBoss Web allowed the definition of XML External Entities
(XXEs) in provided XSLTs. A malicious application could use this to
circumvent intended security restrictions to disclose sensitive
information. (CVE-2014-0096)

It was found that, in certain circumstances, it was possible for a
malicious web application to replace the XML parsers used by JBoss Web to
process XSLTs for the default servlet, JSP documents, tag library
descriptors (TLDs), and tag plug-in configuration files. The injected XML
parser(s) could then bypass the limits imposed on XML external entities
and/or gain access to the XML files processed for other web applications
deployed on the same JBoss Web instance. (CVE-2014-0119)

The CVE-2014-0075 issue was discovered by David Jorm of Red Hat Product
Security.

All users of Red Hat JBoss Enterprise Application Platform 6.2.4 as
provided from the Red Hat Customer Portal are advised to apply this update.
The JBoss server process must be restarted for the update to take effect.

Solution

The References section of this erratum contains a download link (you must
log in to download the update). Before applying this update, back up your
existing Red Hat JBoss Enterprise Application Platform installation and
deployed applications.

Affected Products

• JBoss Enterprise Application Platform Text-Only Advisories x86_64

Fixes

• BZ - 1072776 - CVE-2014-0075 Tomcat/JBossWeb: Limited DoS in chunked transfer encoding input filter
• BZ - 1088342 - CVE-2014-0096 Tomcat/JBossWeb: XXE vulnerability via user supplied XSLTs
• BZ - 1102030 - CVE-2014-0099 Tomcat/JBossWeb: Request smuggling via malicious content length header
• BZ - 1102038 - CVE-2014-0119 Tomcat/JBossWeb: XML parser hijack by malicious web application

CVEs

• CVE-2014-0075
• CVE-2014-0096
• CVE-2014-0099
• CVE-2014-0119

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/jbossnetwork/restricted/listSoftware.html?product=appplatform&downloadType=securityPatches&version=6.2.0