RHSA-2010:0168: Moderate: httpd security and enhancement update

The Apache HTTP Server is a popular web server.It was discovered that modproxyajp incorrectly returned an "InternalServer Error" response when processing certain malformed requests, whichcaused the back-end server to be marked as failed in configurations wheremodproxy is used in load balancer mode. A remote attacker could causemodproxy to not send requests to back-end AJP (Apache JServ Protocol)servers for the retry timeout period (60 seconds by default) by sendingspecially-crafted requests. (CVE-2010-0408)A use-after-free flaw was discovered in the way the Apache HTTP Serverhandled request headers in subrequests. In configurations where subrequestsare used, a multithreaded MPM (Multi-Processing Module) could possibly leakinformation 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 installed, modssl will refuse to renegotiate a TLS/SSL connection with an unpatched clientthat does not support RFC 5746. This update adds the"SSLInsecureRenegotiation" configuration directive. If this directive isenabled, modssl will renegotiate insecurely with unpatched clients.(BZ#567980)Refer to the following Red Hat Knowledgebase article for more details aboutthe changed modssl behavior: http://kbase.redhat.com/faq/docs/DOC-20491 All httpd users should upgrade to these updated packages, which containbackported patches to correct these issues and add this enhancement. Afterinstalling the updated packages, the httpd daemon must be restarted for theupdate to take effect.