Countly - Cross-Site Scripting

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# Exploit Title: Countly-server Stored(Persistent) XSS Vulnerability 
# Date: Monday - 2018 13 August
# Author: 10:10AM Team
# Discovered By: Sleepy
# Software Link: https://github.com/Countly/countly-server
# Version: All Version
# Category: Web-apps
# Security Risk: Critical
# Tested on: GNU/Linux Ubuntu 16.04 - win 10
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#  Exploit:
#  Description:
#
#     Attacker can use multiple parameters in the provided link to inject his own data in the database 
#     of this application,the injected data can then be directly viewed in the event logs panel
#     (manage>logger).
#     Attacker may use this vulnerability to inject his own payload for attacks like Stored XSS.
#     The injected payload will be executed everytime that the target page gets visited/refreshed.
#
#  Proof of Concept:
#
#     Injection URL:
#
#            � 	http://[server_ip]:[api_port]/i?api_key=[api_key]&parameter_1=[payload_1]&parameter_2=[payload_2]&etc...   
#
#     Execution URL(login to server dashboard and navigate to "event logs" panel):
#
#            �  http://[server_ip]:[server_port]/dashboard#/[app_key]/manage/logger
#	
#
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# WE ARE: Sleepy({ssleeppyy@gmail.com}), Mikili({mikili.land@gmail.com})
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