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How to secure your code from XSS
  • undead
    Posts: 822
    How to secure your code from XSS

    It's easy to secure if you found XSS bugs. Look at this code:

    if(isset($_POST['form'])){echo "<html><body>" .$_POST['form']. "</body></html>";}

    Say the variable $_POST['from'] was coming from a input box then you have a XSS attack.
    It is a very easy way to secure that.

    $charset='UTF-8'; $data = htmlentities ($_POST['form'], ENT_NOQUOTES, $charset);
    if(isset($data)){echo "<html><body>" .$data. "</body></html>";}

    That will take all possible code and make it not executable by turning it into stuff like
    < ect.

    You won't notice a diffrence when using htmlentries();.

    Also there's another common function: striptags().

    Another way to show you how to secure integer variables.

    $this = $_GET['id'];
    echo "You are viewing " . $this . "blog";

    If we include ?id=<script>alert("XSS")</script>
    in the URL it is going to execute our code. An easy way to secure this is using (int):

    $this = (int)$_GET['id'];
    echo "You are viewing " . $this . "blog";
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