> ## Documentation Index
> Fetch the complete documentation index at: https://rootea.es/llms.txt
> Use this file to discover all available pages before exploring further.

# Laboratory

> Verified writeups for the Laboratory machine of Hack The Box

# Laboratory

<p className="machine-summary"><span className="prompt"><code>\$ tldr</code></span> GitLab arbitrary file read + deser RCE → gitlab-rails admin</p>

<div className="machine-meta">
  | ·                | ·                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
  | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  | Operating system | Linux                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
  | Difficulty       | Easy                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
  | Vector           | <span className="vbadge vbadge-web">Web</span>                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
  | IP               | `10.10.10.216`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
  | Retirement date  | 2021-04-17                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
  | Skills           | SSL Certificate Enumeration Gitlab Enumeration Gitlab Exploitation - Arbitrary file read via the UploadsRewriter when moving an issue Gitlab Exploitation - Malicious Marshalled Payload in a session cookie + Deserialization Attack \[RCE] Abusing gitlab-rails console - Granting administrator privileges to our user EXTRA - Playing with Vulhub Pre-Built Vulnerable Environments Based on Docker-Compose Information Leakage - SSH Access Abusing SUID Binary + PATH Hijacking \[Privilege Escalation] |
</div>

## Writeups

| Language | Author      | Format | Link                                                          |
| -------- | ----------- | ------ | ------------------------------------------------------------- |
| 🇪🇸 ES  | **S4vitar** | Vídeo  | [Open](https://www.youtube.com/watch?v=kspptAGubDo)           |
| 🇬🇧 EN  | **0xdf**    | Texto  | [Open](https://0xdf.gitlab.io/2021/04/17/htb-laboratory.html) |
| 🇬🇧 EN  | **IppSec**  | Vídeo  | [Open](https://www.youtube.com/watch?v=ozmHeApuSj8)           |

## Skill resources

Curated documentation for each technique listed in the *Skills* column above. Sources: HackTricks, GTFOBins, PortSwigger, etc.

| Skill                       | Source      | Link                                                                          |
| --------------------------- | ----------- | ----------------------------------------------------------------------------- |
| Information Leakage         | HackTricks  | [Open](https://book.hacktricks.wiki/en/pentesting-web/information-leak.html)  |
| Insecure Deserialization    | PortSwigger | [Open](https://portswigger.net/web-security/deserialization)                  |
| SUID binaries               | GTFOBins    | [Open](https://gtfobins.github.io/#+suid)                                     |
| Remote Code Execution (RCE) | HackTricks  | [Open](https://book.hacktricks.wiki/en/pentesting-web/command-injection.html) |

## Related skills worth mastering

Sudo abuse · linPEAS · Local File Inclusion (LFI) · Remote File Inclusion (RFI) · Shellshock (CVE-2014-6271)

## If you liked this machine, try

* [Jewel](/en/htb/machines/linux/medio/jewel) — Linux, Medium
* [Bank](/en/htb/machines/linux/facil/bank) — Linux, Easy
* [Frolic](/en/htb/machines/linux/facil/frolic) — Linux, Easy
* [Celestial](/en/htb/machines/linux/medio/celestial) — Linux, Medium
* [Feline](/en/htb/machines/linux/dificil/feline) — Linux, Hard

***

## Comments & tips

Did the official writeup not work? Found a smarter trick? Share it here — comments live in [GitHub Discussions](https://github.com/FFuson/HTB_Writeups/discussions).

<div className="rootea-giscus-wrap" data-giscus-term="machine:laboratory" data-giscus-lang="en" />

*Last updated: 2026-06-15*

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