Secure Programming in PHP

    Date27 Sep 2002
    4095
    Posted ByAnthony Pell
    The goal of this paper is not only to show common threats and challenges of programming secure PHP applications but also to show you practical methods for doing so. The wonderful thing about PHP is that people with little or even . . . The goal of this paper is not only to show common threats and challenges of programming secure PHP applications but also to show you practical methods for doing so. The wonderful thing about PHP is that people with little or even no programming experience are able to achieve simple goals very quickly. The problem, on the other hand, is that many programmers are not really conscious about what is going behind the curtains. Security and convenience do not often go hand in hand -- but they can.

    PHP has some very flexible file handling functions. The include(), require() and fopen() functions accept local path names as well as remote files using URLs. A lot of vulnerabilities I have seen are due to incorrect handling of dynamic file or path names.

    On a site I will not mention in this article (because the problem still has not been solved) has one script which includes various HTML files and displays them in the proper layout. Have a look at the following URL:

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