Introduction PHP is a remarkably powerful open-source server-side scripting language. In very little code it is possible to do things which would be much more complex to do in other similar languages like Perl, ASP, JSP, ColdFusion, or C. However, the desire to hack together a quick solution can lead to insecure web applications which can place your data and, in some cases, your server at risk. This presentation will address some of these issues as they relate to PHP and offer some suggestions to get you thinking in a direction which will provide more security. PHP is neither inherintly secure nor insecure. It is the responsibility of the programmer of a web application, the database administrator and the system administrator to ensure that security is not compromised at several levels as described in Mark Nenadov's article Developing Secure Web Applications. Operating System/Web Server Layer (Red Hat Linux with Apache) General Application Layer (issues common to any web applicatio...
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