To test the installation, create the simple PHP script /var/The script can be run from the command line with the ∼]# php /var/www/html/test.php The installation provides two related programs – /usr/bin/php and ∼]# ls -l /usr/bin/php* This installs the package php along with the dependencies php-cli and php-common. To install PHP on a CentOS system, say a CentOS 6.2 system, start by installing PHP using yum with the ∼]# yum install php The second option is to install PHP as a CGI program that runs separately from Apache. One option is to install PHP as an Apache module so that PHP is directly incorporated in Apache. There are two options when installing PHP on a Linux system with Apache. Both application attacks and direct attacks on PHP can be blocked by ModSecurity. Older versions of PHP are vulnerable to attack directly, independently of the security of any PHP application. Exploiting these vulnerabilities often requires a particular PHP configuration, and so can be mitigated by securing the PHP configuration. Common attack vectors include the use of global variables or the use of included files. Poorly written applications in PHP are vulnerable to attack. It is also possible to install and use PHP with IIS. The XAMPP package provides Apache, MySQL, and PHP for Windows systems in a single installer. It is also possible to run PHP on Windows systems. It can be installed on these systems either as an Apache module or as a stand-alone CGI program this can lead to very different security outcomes. PHP is included in the software repositories for the different versions of Linux under consideration. During 2008–2013, some systems continued to support and run the older PHP 4, which was released in 1998. The current version of PHP is PHP 5, which was initially released in July 2004. It provides a full-featured programming language to develop web pages with active content it currently is used as the server-side programming language for roughly 80% of all web sites. PHP is the final component of the traditional “LAMP” stack – -Linux, Apache, MySQL, and PHP. PHPĭepartment of Mathematics, Towson University, Towson, MD, US Cyber Operations: Building, Defending, and Attacking Modern Computer Networks (2015) 17.
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