A PHP Object injection vulnerability was found in the Analytics Stats Counter Statistics 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.
For feedback or questions about this advisory mail us at sumofpwn at securify.nl
This issue has been found during the Summer of Pwnage hacker event, running from July 1-29. A community summer event in which a large group of security bughunters (worldwide) collaborate in a month of security research on Open Source Software (WordPress this time). For fun. The event is hosted by Securify in Amsterdam.
OVE-20160803-0005
This issue was successfully tested on the Analytics Stats Counter Statistics WordPress Plugin version 1.2.2.5.
There is currently no fix available.
The Analytics Stats Counter Statistics WordPress Plugin analyses visitors statistics on a WordPress site. A PHP Object injection vulnerability was found in the Analytics Stats Counter Statistics WordPress Plugin, which can be used by an unauthenticated user to instantiate arbitrary PHP Objects.
This issue is possible due to an unsafe call to unserialize() in the wpadm_unpack() method. The input is taken directly from the POST request as can be seen in the following code fragment:
wpadm.php:
if ( ! function_exists( 'wpadm_run' )) {
function wpadm_run($pl, $dir) {
@set_time_limit(0);
require_once dirname(__FILE__) . '/class-wpadm-method-class.php';
$request_name = 'wpadm_'.$pl.'_request';
if( isset( $_POST[$request_name] ) && ! empty ( $_POST[$request_name] ) ) {
require_once dirname(__FILE__) . '/class-wpadm-core.php';
$wpadm = new WPAdm_Core(wpadm_unpack($_POST[$request_name]), $pl, $dir);
echo '<wpadm>'.wpadm_pack($wpadm->getResult()->toArray()).'</wpadm>';
exit;
}
}
}
if ( ! function_exists( 'wpadm_unpack' )) {
/**
* @param str $str
* @return mixed
*/
function wpadm_unpack( $str ) {
return unserialize( base64_decode( $str ) );
}
}
It has been confirmed that this issues can be used to execute arbitrary PHP code.