WordPress WP-Cron 1.1.5 Cross Site Scripting Vulnerability

Product: WP-Cron Dashboard Wordpress plugin
Vendor: OKAMOTO Wataru 
Vulnerable Version(s): 1.1.5 and probably prior
Tested Version: 1.1.5
Advisory Publication:  December 5, 2013  [without technical details]
Vendor Notification: December 5, 2013 
Public Disclosure: December 26, 2013 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2013-6991
Risk Level: Low 
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status: Solution Available
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in WP-Cron Dashboard Wordpress plugin, which can be exploited to perform Cross-Site Scripting (XSS) attacks.


1) Cross-Site Scripting (XSS) in WP-Cron Dashboard Wordpress plugin: CVE-2013-6991

The vulnerability exists due to insufficient sanitisation of user-supplied data in "procname" HTTP POST parameter passed to "/wp-admin/tools.php" script. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to display "immuniweb" word:

<form action="http://[host]/wp-admin/tools.php?page=wp-cron-dashboard" method="post" name="main">
<input type="hidden" name="procname"  value='<script>alert("immuniweb");</script>'>
<input type="hidden" name="submit"  value='1'>
<input type="submit" id="btn">
</form>


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Solution:

Vendor did not reply to 3 notifications by email, 3 notifications via contact form, 1 notification via twitter, 1 forum thread. Currently we are not aware of any official solution for this vulnerability.

Unofficial patch was developed by High-Tech Bridge Security Research Lab and is available here: https://www.htbridge.com/advisory/HTB23189-patch.zip

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