PHP versions above 4.1.2 and below or equal to 5.0.1 suffer from an exposure of arbitrary memory due to bad array parsing in php_variables.c.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34378/phpvulns501.txt
Source: https://packetstormsecurity.com/files/34378/phpvulns501.txt.html