FreshFTP 5.52 - '.qfl' Crash (PoC)

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# Exploit Title: FreshFTP .QFL Local DOS(While Parsing).
# Date: 9/15/2015
# Exploit Author: Un_N0n
# Software Vendor : http://www.freshwebmaster.com/
# Software Link: http://www.freshwebmaster.com/download.html
# Version: 5.52
# Tested on: Windows 7 x86(32 BIT)
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[Steps to Produce the Crash]:
1- Goto Directory in which freshftp is installed.
2- create a file "Test.QFL"
3- paste in the following contents in it:
'''
	FFD
    QUEUE    «AJ»
	AAAAA....upto 66666(bigger the file, more the resource usage)
'''
4- Save the file.
5- open freshftp.exe
6- When freshftp is started it looks for QFL file to load it, in this case, freshFTP suffers a 
   DOS condition due to unexpected format of the QFL file.
7- there is another case, sometimes freshftp won't load QFL on the startup, so to perform DOS
   in this case, goto Queue-> Open Queue -> Browse the QFL file, DOS Condition occurs.
8- At the next startup, freshFTP will look for QFL file before starting therefore DOS condition
   again.
   
This DOS condition leads to very high CPU Usage as well as RAM usage which can harm your system
so test carefully.
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