iStock Management System 1.0 - Arbitrary File Upload

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# Exploit Title: iStock Management System 1.0 - Arbitrary File Upload
# Dork: N/A
# Date: 30.10.2017
# Vendor Homepage: http://ikodes.com/
# Software Link: https://codecanyon.net/item/istock-management-system/20405084
# Demo: http://project.ikodes.com/basicims/
# Version: 1.0
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: CVE-2017-15962
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# Exploit Author: Ihsan Sencan
# Author Web: http://ihsan.net
# Author Social: @ihsansencan
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# Description:
# The vulnerability allows an users upload arbitrary file....
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# Proof of Concept: 
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# http://localhost/[PATH]/user/profile
# http://localhost/[PATH]//assets/images/[FILE]
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# Etc..
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