HackTheBox - Oopsie Writeup

Enumeration

• Top 1000 ports scan

nmap -sC -sV -oN nmap/inital 10.10.10.28

• all ports scan

nmap -sC -sV -p- -oN nmap/all_ports 10.10.10.28

• Still the same result
• Open ports
  • port 22 / ssh
  • port 80 / http

The Website

Gobuster

• Auto recon in the background
• looking the hidden directory

gobuster dir -u http://10.10.10.28 -w /opt/SecLists/Discovery/Web-Content/raft-medium-directories.txt -o gobuster.log

• The result

This webpage have an upload directory.

Login Page

• Found something insteresting in the source code

• the directory into /cdn-cgi/login/script.js
• navigate into http://10.10.10.28/cdn-cgi/login
• found the login page

• Got the credentials in previous box called Archetype in official pdf
• Successfully login as admin

Can’t Upload

• navigate to the upload page
• it says super admin have right to view it

The ID

• This page appear to be user table base on the id parameter in the link
• Making python script for IDs brute-force

Foothold/Gaining Access

Python Script

• python script for ID brute force
• need cookies for authentication

#!/usr/bin/env python3

import requests

for i in range(101):
    url = f"http://10.10.10.28/cdn-cgi/login/admin.php?content=accounts&id={i}"
    c = {'user':'34322','role':'admin'}
    r = requests.get(url, cookies=c)

    if len(r.content) == 3595: # nothing appear just pass it
        pass
    else:
        print(f"Check this ID out {i}")
print("Done")

• The result

• Here is the ID lead to (in order)

{'access id':'34322','name':'admin','email':'[email protected]'}
{'access id':'8832','name':'john','email':'[email protected]'}
{'access id':'57633','name':'Peter','email':'[email protected]'}
{'access id':'28832','name':'Rafol','email':'[email protected]'}
{'access id':'xxxxx','name':'super admin','email':'[email protected]'}

Upload as super admin

• Found the super admin table

• Turns out the Access ID it is the cookie value
• Change the admin cookies into super admin

before

after refresh the page

Reverse Shell

• Upload the php reverse shell
  • Here is the source

• Activated the reverse shell
  • through this link

• Got the shell

www-data

• Found the credentials in file called db.php
• in /var/www/html/cdn-cgi/login/db.php

Robert

• Login as robert

User Flag

• Find the SUID
• The command for find it

find / -user root -perm -4000 -exec ls {} \; 2>/dev/null

• Found weird binary that not suppose to be there

Privilege Escalation

Bugtracker

• This is how it works
• However it says no such file or directory

• Try strings out the binary
• Turns out this binary use cat command
• However this is use relative path

• explain the relative & absolute path

Relative Path Abused

• Make a fake cat command
  • by puting /bin/bash in it
  • the bugtracker binary will execute this fake file as root
  • source for relative path abused

Root Flag

Conclusion

I’ve learned a lot today. Never put the user ID as cookies value and make sure you configure the website properly. Lastly, make sure to configure the SUID binary carefully and do not put any untrust or unpatched version as SUID

I have a fun time doing this machine and I hope you guys too. Bye ;)