- Issued:
- 2012-01-19
- Updated:
- 2012-01-19
RHSA-2012:0041 - Security Advisory
Synopsis
Moderate: jbossweb security update
Type/Severity
Security Advisory: Moderate
Topic
An update for JBoss Enterprise Application Platform 4.3.0 CP10 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
JBoss Web Server is the web container, based on Apache Tomcat, in JBoss
Enterprise Application Platform. It provides a single deployment platform
for the JavaServer Pages (JSP) and Java Servlet technologies.
Multiple flaws were found in the way JBoss Web Server handled HTTP DIGEST
authentication. These flaws weakened the JBoss Web Server HTTP DIGEST
authentication implementation, subjecting it to some of the weaknesses of
HTTP BASIC authentication, for example, allowing remote attackers to
perform session replay attacks. (CVE-2011-1184, CVE-2011-5062,
CVE-2011-5063, CVE-2011-5064)
It was found that the Java hashCode() method implementation was susceptible
to predictable hash collisions. A remote attacker could use this flaw to
cause JBoss Web Server to use an excessive amount of CPU time by sending an
HTTP request with a large number of parameters whose names map to the same
hash value. This update introduces a limit on the number of parameters and
headers processed per request to mitigate this issue. The default limit is
512 for parameters and 128 for headers. These defaults can be changed by
setting the org.apache.tomcat.util.http.Parameters.MAX_COUNT and
org.apache.tomcat.util.http.MimeHeaders.MAX_COUNT system properties in
"jboss-as/server/[PROFILE]/deploy/properties-service.xml". (CVE-2011-4858)
A flaw was found in the way JBoss Web Server handled sendfile request
attributes when using the HTTP APR (Apache Portable Runtime) or NIO
(Non-Blocking I/O) connector. A malicious web application running on a
JBoss Web Server instance could use this flaw to bypass security manager
restrictions and gain access to files it would otherwise be unable to
access, or possibly terminate the Java Virtual Machine (JVM).
(CVE-2011-2526)
Red Hat would like to thank oCERT for reporting CVE-2011-4858, and the
Apache Tomcat project for reporting CVE-2011-2526. oCERT acknowledges
Julian Wälde and Alexander Klink as the original reporters of
CVE-2011-4858.
Warning: Before applying this update, 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 4.3.0 CP10 as provided
from the Red Hat Customer Portal are advised to install this update.
Solution
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 Application Platform installation (including all
applications and configuration files).
The JBoss server process must be restarted for this update to take effect.
Affected Products
- JBoss Enterprise Application Platform Text-Only Advisories x86_64
Fixes
- BZ - 720948 - CVE-2011-2526 tomcat: security manager restrictions bypass
- BZ - 741401 - CVE-2011-1184 CVE-2011-5062 CVE-2011-5063 CVE-2011-5064 tomcat: Multiple weaknesses in HTTP DIGEST authentication
- BZ - 750521 - CVE-2011-4858 tomcat: hash table collisions CPU usage DoS (oCERT-2011-003)
The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
