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POWebsite Link Injection
 

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  1. POWebsite Link Injection
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    <p>I have a website that is fairly static. It has some forms on it to send in contact information, mailing list submissions, etc. Perhaps hours/days after an upload to the site I found that the main index page had new code in it that I had not placed there that contained a hidden bunch of links in a invisible div.</p> <p>I have the following code the handles the variables sent in from the form.</p> <pre><code>&lt;?php // PHP Mail Order to email@email.com w/ some error detection. $jamemail = "email@email.com"; function check_input($data, $problem='') { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); if ($problem &amp;&amp; strlen($data) == 0) { die($problem); } return $data; } $email = check_input($_POST['email'], "Please input email address."); $name = check_input($_POST['name'], "Please input name."); mail($jamemail, "Mailing List Submission", "Name: " . $name . " Email: " .$email); header('Location: index.php'); ?&gt; </code></pre> <p>I have the following code within the index page to present the form with some Javascript to do error detection on the content of the submission prior to submission.</p> <pre><code> &lt;form action="sendlist.php" method="post" onSubmit="return checkmaill(this);"&gt; &lt;label for="name"&gt;&lt;strong&gt;Name: &lt;/strong&gt;&lt;/label&gt; &lt;input type="text" name="name"/&gt;&lt;br /&gt; &lt;label for="email"&gt;&lt;strong&gt;Email: &lt;/strong&gt;&lt;/label&gt; &lt;input type="text" name="email"/&gt;&lt;br /&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;input type="submit" value="Subscribe" style="width: 100px;"/&gt; &lt;/form&gt; </code></pre> <p>At the end of the day, the source code where the injected hyperlinks is as follows:</p> <pre><code>&lt;/body&gt; &lt;/html&gt;&lt;!-- google --&gt;&lt;font style="position: absolute;overflow: hidden;height: 0;width: 0"&gt; xeex172901 &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/onondaga.php&gt;onondaga&lt;/a&gt; &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/tami.php&gt;tami&lt;/a&gt; &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/shotguns.php&gt;shotguns&lt;/a&gt; &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/weir.php&gt;weir&lt;/a&gt; &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/copperhead.php&gt;copperhead&lt;/a&gt; &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/mpv.php&gt;mpv&lt;/a&gt; &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/brunei.php&gt;brunei&lt;/a&gt; &lt;a href=http://menorca.caeb.com/od9c2/xjdmy/doreen.php&gt;doreen&lt;/a&gt; </code></pre>
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    1. COI don't think anything in that PHP script has the ability to write to file - are you sure that your server is secure? (no security holes).
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      1. USrobbo
    2. COWell, I don't run the server myself as we run the website on a hosting package provided by Hasweb. If it keeps happening I'll have to send in a ticket for help to see if the server has issues.
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      1. USRyan B
 

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