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WordPress YITH WooCommerce Compare 2.0.9 PHP Object Injection

WordPress YITH WooCommerce Compare 2.0.9 PHP Object Injection
Posted Nov 8, 2016
Authored by Yorick Koster, Securify B.V.

WordPress YITH WooCommerce Compare plugin version 2.0.9 suffers from a PHP object injection vulnerability.

tags | exploit, php
MD5 | 31616f34fc67b6800ac686eebe3d57f6

WordPress YITH WooCommerce Compare 2.0.9 PHP Object Injection

Change Mirror Download
------------------------------------------------------------------------
YITH WooCommerce Compare WordPress Plugin unauthenticated PHP Object
injection vulnerability
------------------------------------------------------------------------
Yorick Koster, June 2016

------------------------------------------------------------------------
Abstract
------------------------------------------------------------------------
A PHP Object injection vulnerability was found in the YITH WooCommerce
Compare WordPress Plugin, which can be used by an unauthenticated user
to instantiate arbitrary PHP Objects. Using this vulnerability it is
possible to execute arbitrary PHP code.

------------------------------------------------------------------------
OVE ID
------------------------------------------------------------------------
OVE-20160803-0006

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
This issue was successfully tested on the YITH WooCommerce Compare
WordPress Plugin version 2.0.9.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
This issue is resolved in YITH WooCommerce Compare version 2.1.0.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/yith_woocommerce_compare_wordpress_plugin_unauthenticated_php_object_injection_vulnerability.html

This issue is possible due to an unsafe call to unserialize() in the __construct() method. The input is taken directly from the yith_woocompare_list cookie as can be seen in the following code fragment:

includes/class.yith-woocompare-frontend.php:

/**
* Constructor
*
* @return YITH_Woocompare_Frontend
* @since 1.0.0
*/
public function __construct() {

// set coookiename
if ( is_multisite() ) $this->cookie_name .= '_' . get_current_blog_id();

// populate the list of products
$this->products_list = isset( $_COOKIE[ $this->cookie_name ] ) ? json_decode( maybe_unserialize( $_COOKIE[ $this->cookie_name ] ) ) : array();

It has been confirmed that this issues can be used to execute arbitrary PHP code.
------------------------------------------------------------------------
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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