HackTheBox | SolarLab

In this walkthrough, I demonstrate how I obtained complete ownership of SolarLab on HackTheBox
HackTheBox | SolarLab

Initial Foothold Hint

  • What service can be accessed anonymously (no authentication required)? And what information have you found upon accessing this service?
  • Where else on the box presents a login form?
    • Have you tested the information you've found against this target?
    • What do you notice about error messages with specific usernames?
    • One of the users does not match the pattern that causes this error
  • When you find the login, click around the application.
    • Lots of input points. Have you filled out the form just to see what happens?
    • Download the file to your local machine and analyze it. There should be some breadcrumbs that will tell you how this file was generated
    • Have you found the CVE?

Privilege Escalation Hint

  • How are your network pivoting and tunneling skills?
    • Did you find the admin portal for the service?
    • What version of the service is running and what CVEs exist for it?
  • Once on the box as the service account:
    • What files are you able to read? Did you find anything interesting?
    • Hint: What kind of database is the vulnerable service using?
  • What kind of encryption is in use on this service?
    • How might you go about revealing the secret in plaintext?

Nmap Results

# Nmap 7.94SVN scan initiated Mon May 13 13:06:00 2024 as: nmap -Pn -p- --min-rate 2000 -sC -sV -oN nmap-scan.txt
Nmap scan report for
Host is up (0.045s latency).
Not shown: 65529 filtered tcp ports (no-response)
80/tcp   open  http          nginx 1.24.0
|_http-title: Did not follow redirect to http://solarlab.htb/
|_http-server-header: nginx/1.24.0
135/tcp  open  msrpc         Microsoft Windows RPC
139/tcp  open  netbios-ssn   Microsoft Windows netbios-ssn
445/tcp  open  microsoft-ds?
6791/tcp open  http          nginx 1.24.0
|_http-title: Did not follow redirect to http://report.solarlab.htb:6791/
|_http-server-header: nginx/1.24.0
7680/tcp open  pando-pub?
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows

Host script results:
| smb2-security-mode: 
|   3:1:1: 
|_    Message signing enabled but not required
| smb2-time: 
|   date: 2024-05-13T17:07:53
|_  start_date: N/A

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
# Nmap done at Mon May 13 13:08:29 2024 -- 1 IP address (1 host up) scanned in 149.48 seconds

In the output for tcp/80 and tcp/6791, we can see a redirect to solarlab.htb and report.solarlab.htb respectively. Let's get those hostnames added to our /etc/hosts file.

echo '        solarlab.htb report.solarlab.htb' | sudo tee -a /etc/hosts

This box is still active on HackTheBox. Once retired, this article will be published for public access as per HackTheBox's policy on publishing content from their platform.

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