WordPress WP-Filebase Download Manager 3.4.4 Cross Site Scripting

2017-03-01T00:00:00
ID PACKETSTORM:141383
Type packetstorm
Reporter Yorick Koster
Modified 2017-03-01T00:00:00

Description

                                        
                                            `------------------------------------------------------------------------  
Cross-Site Scripting vulnerability in WP-Filebase Download Manager  
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 WP-Filebase  
Download Manager 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-20160712-0019  
  
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Tested versions  
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This issue was successfully tested on WP-Filebase Download Manager  
WordPress Plugin version 3.4.4.  
  
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Fix  
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There is currently no fix available.  
  
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Details  
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https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_wp_filebase_download_manager_wordpress_plugin.html  
  
The issue exists in the file AdminGuiFiles.php and is caused by the lack of output encoding on the page request parameter. The vulnerable code is listed below.  
  
<form id="posts-filter" action="" method="post">  
<input type="hidden" name="page" value="<?php echo $_REQUEST['page'] ?>" />  
<?php $file_table->display() ?>  
</form>  
  
Normally, the page URL parameter is validated by WordPress, which prevents Cross-Site Scripting. However in this case the value of page is obtained from $_REQUEST, not from $_GET. This allows for parameter pollution where the attacker puts a benign page value in the URL and simultaneously submits a malicious page value as POST parameter.  
  
Proof of concept  
  
<html>  
<body>  
<form action="http://<target>/wp-admin/admin.php?page=wpfilebase_files" method="POST">  
<input type="hidden" name="page" value=""<script>alert(document.cookie);</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.  
`