PHP is an HTML-embedded scripting language commonly used with the ApacheHTTP Server.It was found that the hashing routine used by PHP arrays was susceptibleto predictable hash collisions. If an HTTP POST request to a PHPapplication contained many parameters whose names map to the same hashvalue, a large amount of CPU time would be consumed. This flaw has beenmitigated by adding a new configuration directive, max_input_vars, thatlimits the maximum number of parameters processed per request. Bydefault, max_input_vars is set to 1000. (CVE-2011-4885)An integer overflow flaw was found in the PHP exif extension. On 32-bitsystems, a specially-crafted image file could cause the PHP interpreter tocrash or disclose portions of its memory when a PHP script tries to extractExchangeable image file format (Exif) metadata from the image file.(CVE-2011-4566)Red Hat would like to thank oCERT for reporting CVE-2011-4885. oCERTacknowledges Julian Wälde and Alexander Klink as the original reporters ofCVE-2011-4885.All php53 and php users should upgrade to these updated packages, whichcontain backported patches to resolve these issues. After installing theupdated packages, the httpd daemon must be restarted for the update to takeeffect.