Important: httpd22 security update

Updated httpd22 packages that fix multiple security issues are now
available for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise
Linux 4.

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

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.
(CVE-2009-0023)

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
http://kbase.redhat.com/faq/docs/DOC-11259

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)

https://www.redhat.com/security/data/cve/CVE-2009-0023.html
https://www.redhat.com/security/data/cve/CVE-2009-1195.html
https://www.redhat.com/security/data/cve/CVE-2009-1890.html
https://www.redhat.com/security/data/cve/CVE-2009-1891.html
https://www.redhat.com/security/data/cve/CVE-2009-1955.html
http://www.redhat.com/security/updates/classification/#important