(RHSA-2010:0396) Moderate: httpd and httpd22 security and enhancement update

The Apache HTTP Server is a popular web server.

It was discovered that mod_proxy_ajp incorrectly returned an “Internal
Server Error” response when processing certain malformed requests, which
caused the back-end server to be marked as failed in configurations where
mod_proxy is used in load balancer mode. A remote attacker could cause
mod_proxy to not send requests to back-end AJP (Apache JServ Protocol)
servers for the retry timeout period (60 seconds by default) by sending
specially-crafted requests. (CVE-2010-0408)

A use-after-free flaw was discovered in the way the Apache HTTP Server
handled request headers in subrequests. In configurations where subrequests
are used, a multithreaded MPM (Multi-Processing Module) could possibly leak
information from other requests in request replies. (CVE-2010-0434)

This update also adds the following enhancement:

• with the updated openssl packages from RHSA-2010:0162 or RHSA-2010:0163
  installed, mod_ssl will refuse to renegotiate a TLS/SSL connection with an
  unpatched client that does not support RFC 5746. This update adds the
  “SSLInsecureRenegotiation” configuration directive. If this directive is
  enabled, mod_ssl will renegotiate insecurely with unpatched clients.

Refer to the following Red Hat Knowledgebase article for more details about
the changed mod_ssl behavior: http://kbase.redhat.com/faq/docs/DOC-20491

All users of JBoss Enterprise Web Server 1.0.1 should upgrade to these
updated packages, which contain backported patches to correct these issues
and add this enhancement. After installing the updated packages, Red Hat
Enterprise Linux 4 users must restart the httpd22 service, and Red Hat
Enterprise Linux 5 users must restart the httpd service, for the update to
take effect.