(RHSA-2011:0196) Moderate: php53 security update

PHP is an HTML-embedded scripting language commonly used with the Apache
HTTP Server.

A flaw was found in the way PHP converted certain floating point values
from string representation to a number. If a PHP script evaluated an
attacker’s input in a numeric context, the PHP interpreter could cause high
CPU usage until the script execution time limit is reached. This issue only
affected 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 to
crash the PHP interpreter by providing excessively long input to be
validated 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 the
input string size, the function could disclose a portion of the PHP
interpreter’s memory. (CVE-2010-4156)

All php53 users should upgrade to these updated packages, which contain
backported patches to resolve these issues. After installing the updated
packages, the httpd daemon must be restarted for the update to take effect.