WordPress Simple Ads Manager 2.9.8.125 PHP Object Injection

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Simple Ads Manager WordPress plugin unauthenticated PHP Object injection  
vulnerability  
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Yorick Koster, July 2016  
  
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Abstract  
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A PHP Object injection vulnerability was found in the Simple Ads Manager  
WordPress plugin. The unauthenticated PHP Object injection vulnerability  
can be used by an unautenthicated user to instantiate arbitrary PHP  
Objects. This issue can potentially result in arbitrary code execution,  
but this has not been confirmed.  
  
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OVE ID  
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OVE-20160712-0041  
  
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Tested versions  
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This issue was succesfully tested on the Simple Ads Manager WordPress  
plugin version 2.9.8.125.  
  
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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/simple_ads_manager_wordpress_plugin_unauthenticated_php_object_injection_vulnerability.html  
  
This issue is possible due to two unsafe calls to unserialize() in the sam-ajax-loader.php file. The input is taken directly from the POST request as can be seen in the following code fragment:  
  
sam-ajax-loader.php:  
  
if ( in_array( $action, $allowed_actions ) ) {  
switch ( $action ) {  
case 'sam_ajax_load_place':  
echo json_encode( array( 'success' => false, 'error' => 'Deprecated...' ) );  
break;  
  
case 'sam_ajax_load_ads':  
if ( ( isset( $_POST['ads'] ) && is_array( $_POST['ads'] ) ) && isset( $_POST['wc'] ) ) {  
$clauses = unserialize( base64_decode( $_POST['wc'] ) );  
  
This issue can potentially result in arbitrary code execution, but this has not been confirmed.  
  
  
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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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