mirror of
https://github.com/AbdullahRizwan101/CTF-Writeups
synced 2024-11-24 21:03:07 +00:00
Create Backdoor.md
This commit is contained in:
ARZ
GitHub
parent
a9c0337249
commit
d308d09e74
1 changed files with 108 additions and 0 deletions
108
HackTheBox/Backdoor.md
Normal file
108
HackTheBox/Backdoor.md
Normal file
|
|
@ -0,0 +1,108 @@
|
|||
# HackTheBox - Backdoor
|
||||
|
||||
## NMAP
|
||||
|
||||
```bash
|
||||
nmap -p- -sC -sV 10.10.11.125 --min-rate 5000 -v
|
||||
|
||||
PORT STATE SERVICE VERSION
|
||||
22/tcp open ssh OpenSSH 8.2p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
|
||||
80/tcp open http Apache httpd 2.4.41 ((Ubuntu))
|
||||
|_http-generator: WordPress 5.8.1
|
||||
| http-methods:
|
||||
|_ Supported Methods: HEAD
|
||||
1337/tcp open waste? syn-ack ttl 63
|
||||
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
|
||||
|
||||
```
|
||||
|
||||
## PORT 80 (HTTP)
|
||||
|
||||
From the scan we saw that there's a web server apache server running on port 80
|
||||
|
||||
<img src="https://i.imgur.com/Ir2boo6.png"/>
|
||||
|
||||
At the bottom , we can see that this is a wordpresss site
|
||||
|
||||
<img src="https://i.imgur.com/wOGkKmC.png"/>
|
||||
|
||||
We can try to login with default creds like admin:admin
|
||||
|
||||
<img src="https://i.imgur.com/IdB9CWr.png"/>
|
||||
|
||||
<img src="https://i.imgur.com/TbKd6Am.png"/>
|
||||
|
||||
It gives an error that password for `admin` user invalid but it didn't say that username is invalid so we could try to brute force but let's just leave it for the last. I tired to run an nmap scan for wordpress plugins but there wasn't any thing interesting
|
||||
|
||||
` nmap -p 80 --script http-wordpress-enum --script-args search-limit=2000 10.10.11.125 -vvv`
|
||||
|
||||
<img src="https://i.imgur.com/qdVJSJb.png"/>
|
||||
|
||||
I ran `wpscan` and used aggresive plugins scan but it was taking so long for it to complete instead I manully tried to enumerate plugins by going to `/wp-content/plugins`
|
||||
|
||||
<img src="https://i.imgur.com/KCvuLmZ.png"/>
|
||||
|
||||
The readme file shows that it's using version 1.1
|
||||
|
||||
<img src="https://i.imgur.com/zbfbe0k.png"/>
|
||||
|
||||
And this version is vulnerable to LFi
|
||||
|
||||
<img src="https://i.imgur.com/6NzFp5p.png"/>
|
||||
|
||||
`10.10.11.125/wp-content/plugins/ebook-download/filedownload.php?ebookdownloadurl=../../../wp-config.php`
|
||||
|
||||
This will download `wp-config.php` file which has the database credentials
|
||||
|
||||
<img src="https://i.imgur.com/RIWMx3p.png"/>
|
||||
|
||||
We can also download `/etc/passwd` file
|
||||
|
||||
`http://10.10.11.125/wp-content/plugins/ebook-download/filedownload.php?ebookdownloadurl=../../../../../../etc/passwd`
|
||||
|
||||
<img src="https://i.imgur.com/SlWpd2r.png"/>
|
||||
|
||||
But we can't do things like log posining as we are only able to download the file not view them directly , remember from our nmap scan we saw that there was a port 1337 but on connecting on the port we don't get any response
|
||||
|
||||
<img src="https://i.imgur.com/dW01a1m.png"/>
|
||||
|
||||
## Foothold
|
||||
In order to find what's running on that port we need can find it by reading ` /proc/sched_debug` , which shows all the processes that are running on the system
|
||||
|
||||
<img src="https://i.imgur.com/8FhrOZ5.png"/>
|
||||
|
||||
On reading that file we can see that `gdbserver` is running and there's a remote code execution exploit available on metasploit
|
||||
|
||||
<img src="https://i.imgur.com/2IeFdoz.png"/>
|
||||
|
||||
I got another reverse shell as I wanted to stabilize the shell and the meterpreter shell isn't stable when we spawn bash
|
||||
|
||||
<img src="https://i.imgur.com/4y2ccHu.png"/>
|
||||
|
||||
So this enabled us to stabilize our shell , now to escalate our privleges I checked `sudo -l` to see if I can run something as root , tried the password that we found from wordpress config file but it didn't work
|
||||
|
||||
<img src="https://i.imgur.com/z15No9t.png"/>
|
||||
|
||||
Checked contab but there wasn't any cronjobs running, logging in to database we can see that there's an admin user's password for wordpress
|
||||
|
||||
<img src="https://i.imgur.com/xzoozsU.png"/>
|
||||
|
||||
## Privilege Escalation
|
||||
|
||||
I checked the running processes and found that a command was being ran to create a deattached `screen` session
|
||||
|
||||
<img src="https://i.imgur.com/WBmQYrR.png"/>
|
||||
|
||||
We can create a deattach session using `-dmS session_name` and we can reattach the session with `-r session_name` but this wasn't working , since screen has SUID bit
|
||||
|
||||
<img src="https://i.imgur.com/iIRapii.png"/>
|
||||
|
||||
We can actually access the screen session as root through `screen -r root/`
|
||||
|
||||
<img src="https://i.imgur.com/3mFZtQv.png"/>
|
||||
|
||||
|
||||
## References
|
||||
- https://www.armourinfosec.com/wordpress-enumeration/
|
||||
- https://stackoverflow.com/questions/9953973/how-to-collect-information-of-every-single-cpu
|
||||
- https://serverfault.com/questions/336594/share-screen-session-with-users-in-the-same-group-linux
|
||||
Loading…
Reference in a new issue