5 - RHSA-2007:0360

Problem Description:

Updated jbossas packages that fix multiple security issues in tomcat are now available for Red Hat Application Stack.

This update has been rated as having Important security impact by the Red Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Application Stack v1 for Enterprise Linux AS (v.4) - noarch Red Hat Application Stack v1 for Enterprise Linux ES (v.4) - noarch

3. Problem description:

Tomcat is a servlet container for Java Servlet and JavaServer Pages technologies.

This update addresses the following issues:

Tomcat was found to accept multiple content-length headers in a request. This could allow attackers to poison a web-cache, bypass web application firewall protection, or conduct cross-site scripting attacks. (CVE-2005-2090)

Tomcat permitted various characters as path delimiters. If Tomcat was used behind certain proxies and configured to only proxy some contexts, an attacker could construct an HTTP request to work around the context restriction and potentially access non-proxied content. (CVE-2007-0450)

Users should upgrade to these erratum packages, which contain an update to jbossas to include a version of Tomcat that resolves these issues. Updated jakarta-commons-modeler packages are also included which correct a bug when used with Tomcat 5.5.23.

4. Solution:

Note: /etc/tomcat5/web.xml has been updated to disable directory listing by default. If you have previously modified /etc/tomcat5/web.xml, this change will not be made automatically and you should manually update the value for the "listings" parameter to "false".

Note: In response to CVE-2007-0450, JBoss AS considers encoded slashes and backslashes in URLs invalid and its usage will result in HTTP 400 error. It is possible to allow encoded slashes and backslashes by following the steps outlined below, however doing so will expose you to CVE-2007-0450 related attacks:

a) If you use the /var/lib/jbossas/bin/run.sh setup, please edit /etc/jbossas/run.conf and append - -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true - -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=true to the string assigned to JAVA_OPTS

b) If you use the init script setup to run multiple JBoss AS services and you wish to allow encoding by default on all services, please edit /etc/jbossas/jbossas.conf and add the line JAVA_OPTS="${JAVA_OPTS} - -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true - -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=true"

c) If you use the init script setup to run multiple JBoss AS services and want to allow encoding of slashes and backslashes for a particular service, please edit /etc/sysconfig/${NAME} (where NAME is the name of your service) and add the line JAVA_OPTS="${JAVA_OPTS} - -Dorg.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH=true - -Dorg.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH=true"

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

This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at http://kbase.redhat.com/faq/FAQ_58_10188

5. Bug IDs fixed (http://bugzilla.redhat.com/):

238574 - CVE-2005-2090 multiple tomcat issues (CVE-2007-0450)