I am trying to learn buffer overflow with Immunity Debugger and Vulnserver. I reached the fuzzing phase and I am trying to use the below python script:

#!/usr/bin/python

​

import sys, socket

from time import sleep

​

buffer = "A" * 100

​

while True:

try:

    s = socket.scoket(socket.AF\_INET, socket.SOCK\_STREAM)

    sconnect(('<IP of the vulnserver>', 9999))

    s.send(('TRUN /.:/'   buffer))

    s.close()

    sleep(1)

    buffer = buffer   "A" \* 100



except:

    print("Fuzzing crashed at %s bytes" % str(len(buffer)))

    sys.exit() 

Yet, when I execute the script I instantly receive this message:

./fuzzing.py

Fuzzing crashed at 100 bytes

When I check the Immunity Debugger nothing happened, it didn't pause as expected, while in the Vulnserver I cannot see any connections. Any idea why? I Googled it and I cannot find any solutions.

Thank you.