Common Vulnerabilities and Exposures assigned an identifier CVE-2013-3735 to the following vulnerability: ** DISPUTED ** The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an attack within a shared web-hosting environment. NOTE: the vendor's http://php.net/security-note.php page says "for critical security situations you should be using OS-level security by running multiple web servers each as their own user id." References: [1] https://bugs.php.net/bug.php?id=64660 [2] https://github.com/php/php-src/blob/php-5.4.16RC1/NEWS [3] https://github.com/php/php-src/blob/php-5.5.0RC2/NEWS [4] https://github.com/php/php-src/commit/fb58e69a84f4fde603a630d2c9df2fa3be16d846
Statement: We do not consider memory safety hazards caused by malformed php scripts as a security issue. Also (as per upstream) OS-level security should be used to protect systems from memory exhaustion caused by php applications.