RHSA-2011:1391: Moderate: httpd security and bug fix update

The Apache HTTP Server is a popular web server.It was discovered that the Apache HTTP Server did not properly validate therequest URI for proxied requests. In certain configurations, if a reverseproxy used the ProxyPassMatch directive, or if it used the RewriteRuledirective with the proxy flag, a remote attacker could make the proxyconnect to an arbitrary server, possibly disclosing sensitive informationfrom internal web servers not directly accessible to the attacker.(CVE-2011-3368)It was discovered that modproxyajp incorrectly returned an "InternalServer Error" response when processing certain malformed HTTP requests,which caused the back-end server to be marked as failed in configurationswhere modproxy was used in load balancer mode. A remote attacker couldcause modproxy to not send requests to back-end AJP (Apache JServProtocol) servers for the retry timeout period or until all back-endservers were marked as failed. (CVE-2011-3348)Red Hat would like to thank Context Information Security for reporting theCVE-2011-3368 issue.This update also fixes the following bug: The fix for CVE-2011-3192 provided by the RHSA-2011:1245 update introduced regressions in the way httpd handled certain Range HTTP headervalues. This update corrects those regressions. (BZ#736592)All httpd users should upgrade to these updated packages, which containbackported patches to correct these issues. After installing the updatedpackages, the httpd daemon must be restarted for the update to take effect.