(RHSA-2012:1045) Moderate: php security update

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

It was discovered that the PHP XSL extension did not restrict the file
writing capability of libxslt. A remote attacker could use this flaw to
create or overwrite an arbitrary file that is writable by the user running
PHP, if a PHP script processed untrusted eXtensible Style Sheet Language
Transformations (XSLT) content. (CVE-2012-0057)

Note: This update disables file writing by default. A new PHP configuration
directive, “xsl.security_prefs”, can be used to enable file writing in
XSLT.

A flaw was found in the way PHP validated file names in file upload
requests. A remote attacker could possibly use this flaw to bypass the
sanitization of the uploaded file names, and cause a PHP script to store
the uploaded file in an unexpected directory, by using a directory
traversal attack. (CVE-2012-1172)

It was discovered that the fix for CVE-2012-1823, released via
RHSA-2012:0546, did not properly filter all php-cgi command line arguments.
A specially-crafted request to a PHP script could cause the PHP interpreter
to output usage information that triggers an Internal Server Error.
(CVE-2012-2336)

A memory leak flaw was found in the PHP strtotime() function call. A remote
attacker could possibly use this flaw to cause excessive memory consumption
by triggering many strtotime() function calls. (CVE-2012-0789)

It was found that PHP did not check the zend_strndup() function’s return
value in certain cases. A remote attacker could possibly use this flaw to
crash a PHP application. (CVE-2011-4153)

All php 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.