PHP is an HTML-embedded scripting language commonly used with the ApacheHTTP Server.A flaw was found in the way PHP converted certain floating point valuesfrom string representation to a number. If a PHP script evaluated anattacker's input in a numeric context, the PHP interpreter could cause highCPU usage until the script execution time limit is reached. This issue onlyaffected i386 systems. (CVE-2010-4645)A stack memory exhaustion flaw was found in the way the PHP filter_var()function validated email addresses. An attacker could use this flaw tocrash the PHP interpreter by providing excessively long input to bevalidated as an email address. (CVE-2010-3710)A memory disclosure flaw was found in the PHP multi-byte string extension.If the mb_strcut() function was called with a length argument exceeding theinput string size, the function could disclose a portion of the PHPinterpreter's memory. (CVE-2010-4156)All php53 users should upgrade to these updated packages, which containbackported patches to resolve these issues. After installing the updatedpackages, the httpd daemon must be restarted for the update to take effect.