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AUSCERT External Security Bulletin Redistribution
Important: httpd22 security update
20 July 2009
AusCERT Security Bulletin Summary
Product: JBoss Enterprise Web Server
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux AS/ES/WS 4
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2009-1955 CVE-2009-1891 CVE-2009-1890
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Red Hat Security Advisory
Synopsis: Important: httpd22 security update
Advisory ID: RHSA-2009:1160-01
Product: JBoss Enterprise Web Server
Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-1160.html
Issue date: 2009-07-17
CVE Names: CVE-2009-0023 CVE-2009-1195 CVE-2009-1890
Updated httpd22 packages that fix multiple security issues are now
available for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise
This update has been rated as having important security impact by the Red
Hat Security Response Team.
2. Relevant releases/architectures:
JBoss Enterprise Web Server 4AS-JBEWS-5.0.0 - i386, x86_64
JBoss Enterprise Web Server 4ES-JBEWS-5.0.0 - i386, x86_64
The Apache HTTP Server is a popular Web server. The httpd22 packages
shipped with JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux
4 contain an embedded copy of the Apache Portable Runtime (APR) utility
library, a free library of C data structures and routines, which includes
interfaces to support XML parsing, LDAP connections, database interfaces,
URI parsing, and more.
A denial of service flaw was found in the Apache mod_proxy module when it
was used as a reverse proxy. A remote attacker could use this flaw to force
a proxy process to consume large amounts of CPU time. (CVE-2009-1890)
A denial of service flaw was found in the apr-util Extensible Markup
Language (XML) parser. A remote attacker could create a specially-crafted
XML document that would cause excessive memory consumption when processed
by the XML decoding engine. (CVE-2009-1955)
A heap-based underwrite flaw was found in the way apr-util created compiled
forms of particular search patterns. An attacker could formulate a
specially-crafted search keyword, that would overwrite arbitrary heap
memory locations when processed by the pattern preparation engine.
A flaw was found in the handling of the "Options" and "AllowOverride"
directives used by the Apache HTTP Server. In configurations using the
"AllowOverride" directive with certain "Options=" arguments, local users
were not restricted from executing commands from a Server-Side-Include
script as intended. (CVE-2009-1195)
A denial of service flaw was found in the Apache mod_deflate module. This
module continued to compress large files until compression was complete,
even if the network connection that requested the content was closed before
compression completed. This would cause mod_deflate to consume large
amounts of CPU if mod_deflate was enabled for a large file. (CVE-2009-1891)
All users of JBoss Enterprise Web Server 1.0.0 should upgrade to these
updated packages, which contain backported patches to correct these issues.
After installing the updated packages, the httpd daemon must be restarted
for the update to take effect.
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
5. Bugs fixed (http://bugzilla.redhat.com/):
489436 - CVE-2009-1195 AllowOverride Options=IncludesNoExec allows Options Includes
503928 - CVE-2009-0023 apr-util heap buffer underwrite
504555 - CVE-2009-1955 apr-util billion laughs attack
509125 - CVE-2009-1891 httpd: possible temporary DoS (CPU consumption) in mod_deflate
509375 - CVE-2009-1890 httpd: mod_proxy reverse proxy DoS (infinite loop)
6. Package List:
JBoss Enterprise Web Server 4AS-JBEWS-5.0.0:
JBoss Enterprise Web Server 4ES-JBEWS-5.0.0:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2009 Red Hat, Inc.
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