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

# Nightmare

> Writeups verificados de la máquina Nightmare de Hack The Box

# Nightmare

<p className="machine-summary"><span className="prompt"><code>\$ tldr</code></span> OpenSSH SFTP misconfig → command injection → Ubuntu Xenial kernel</p>

<div className="machine-meta">
  | ·                 | ·                                                                                                                                                                                                                                                                                                                                |
  | ----------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  | Sistema operativo | Linux                                                                                                                                                                                                                                                                                                                            |
  | Dificultad        | Insano                                                                                                                                                                                                                                                                                                                           |
  | Vector            | <span className="vbadge vbadge-web">Web</span>                                                                                                                                                                                                                                                                                   |
  | IP                | `10.10.10.66`                                                                                                                                                                                                                                                                                                                    |
  | Fecha de retirada | —                                                                                                                                                                                                                                                                                                                                |
  | Skills            | HTML Injection XSS Injection SQL Injection (SQLI) - Error Based OpenSSH \<= 6.6 SFTP misconfiguration universal exploit (RCE) Script Modification Binary Analysis \[GHIDRA/Radare2] In-depth analysis with Radare2 \[Tips and tricks] Command Injection - User Pivoting Ubuntu Xenial Privilege Escalation - Kernel Exploitation |
</div>

## Writeups

| Idioma  | Autor       | Formato | Enlace                                               |
| ------- | ----------- | ------- | ---------------------------------------------------- |
| 🇪🇸 ES | **S4vitar** | Vídeo   | [Abrir](https://www.youtube.com/watch?v=nBDnCjRxmO8) |
| 🇬🇧 EN | **IppSec**  | Vídeo   | [Abrir](https://www.youtube.com/watch?v=frh-jYaUvrU) |

## Recursos por skill

Documentación curada para cada técnica que aparece en la columna *Skills* de arriba. Fuentes: HackTricks, GTFOBins, PortSwigger, etc.

| Skill                       | Fuente      | Enlace                                                                                      |
| --------------------------- | ----------- | ------------------------------------------------------------------------------------------- |
| OS Command Injection        | PortSwigger | [Abrir](https://portswigger.net/web-security/os-command-injection)                          |
| SQL Injection               | HackTricks  | [Abrir](https://book.hacktricks.wiki/en/pentesting-web/sql-injection/index.html)            |
| SQL Injection               | PortSwigger | [Abrir](https://portswigger.net/web-security/sql-injection)                                 |
| Port Forwarding / Pivoting  | HackTricks  | [Abrir](https://book.hacktricks.wiki/en/generic-hacking/tunneling-and-port-forwarding.html) |
| Remote Code Execution (RCE) | HackTricks  | [Abrir](https://book.hacktricks.wiki/en/pentesting-web/command-injection.html)              |
| Cross-Site Scripting (XSS)  | HackTricks  | [Abrir](https://book.hacktricks.wiki/en/pentesting-web/xss-cross-site-scripting/index.html) |
| Cross-Site Scripting (XSS)  | PortSwigger | [Abrir](https://portswigger.net/web-security/cross-site-scripting)                          |

## Skills relacionadas que conviene dominar

Local File Inclusion (LFI) · Remote File Inclusion (RFI) · Shellshock (CVE-2014-6271) · Server-Side Request Forgery

## Si te gustó esta máquina, prueba

* [Holiday](/htb/machines/linux/dificil/holiday) — Linux, Difícil
* [ScriptKiddie](/htb/machines/linux/facil/scriptkiddie) — Linux, Fácil
* [Union](/htb/machines/linux/medio/union) — Linux, Medio
* [Toolbox](/htb/machines/windows/facil/toolbox) — Windows, Fácil
* [Oz](/htb/machines/linux/dificil/oz) — Linux, Difícil

***

## Comentarios y truquillos

¿Algo no funcionó del writeup oficial? ¿Has encontrado un truco mejor? Compártelo aquí — los comentarios viven en [GitHub Discussions](https://github.com/FFuson/HTB_Writeups/discussions).

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*Última actualización: 2026-07-13*

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