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

# Backdoor

> Verified writeups for the Backdoor machine of Hack The Box

# Backdoor

<p className="machine-summary"><span className="prompt"><code>\$ tldr</code></span> WordPress LFI → /proc/cmdline a RCE → screen session hijack</p>

<div className="machine-meta">
  | ·                | ·                                                                                                                                                                                      |
  | ---------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  | Operating system | Linux                                                                                                                                                                                  |
  | Difficulty       | Easy                                                                                                                                                                                   |
  | Vector           | <span className="vbadge vbadge-web">Web</span>                                                                                                                                         |
  | IP               | `10.10.11.125`                                                                                                                                                                         |
  | Retirement date  | 2022-04-23                                                                                                                                                                             |
  | Skills           | WordPress Local File Inclusion Vulnerability (LFI) LFI to RCE (Abusing /proc/PID/cmdline) Gdbserver RCE Vulnerability Abusing Screen (Privilege Escalation) \[Session synchronization] |
</div>

## Writeups

| Language | Author                   | Format | Link                                                        |
| -------- | ------------------------ | ------ | ----------------------------------------------------------- |
| 🇪🇸 ES  | **S4vitar**              | Vídeo  | [Open](https://www.youtube.com/watch?v=u5hjJ3p-XfU)         |
| 🇪🇸 ES  | **El Pingüino de Mario** | Vídeo  | [Open](https://www.youtube.com/watch?v=lbrs2-D57hA)         |
| 🇬🇧 EN  | **0xdf**                 | Texto  | [Open](https://0xdf.gitlab.io/2022/04/23/htb-backdoor.html) |
| 🇬🇧 EN  | **IppSec**               | Vídeo  | [Open](https://www.youtube.com/watch?v=4zrypJMVWpc)         |

## Skill resources

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

| Skill                       | Source               | Link                                                                                              |
| --------------------------- | -------------------- | ------------------------------------------------------------------------------------------------- |
| Local File Inclusion (LFI)  | HackTricks           | [Open](https://book.hacktricks.wiki/en/pentesting-web/file-inclusion/index.html)                  |
| Local File Inclusion (LFI)  | PayloadsAllTheThings | [Open](https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/File%20Inclusion)          |
| WordPress Exploitation      | HackTricks           | [Open](https://book.hacktricks.wiki/en/network-services-pentesting/pentesting-web/wordpress.html) |
| Remote Code Execution (RCE) | HackTricks           | [Open](https://book.hacktricks.wiki/en/pentesting-web/command-injection.html)                     |

## Related skills worth mastering

Remote File Inclusion (RFI) · Shellshock (CVE-2014-6271)

## If you liked this machine, try

* [CrimeStoppers](/en/htb/machines/linux/dificil/crimestoppers) — Linux, Hard
* [Poison](/en/htb/machines/linux/medio/poison) — Linux, Medium
* [Monitors](/en/htb/machines/linux/dificil/monitors) — Linux, Hard
* [TartarSauce](/en/htb/machines/linux/medio/tartarsauce) — Linux, Medium
* [Travel](/en/htb/machines/linux/dificil/travel) — 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:backdoor" data-giscus-lang="en" />

*Last updated: 2026-06-07*

<script type="application/ld+json">
  {`{"@context":"https://schema.org","@type":"TechArticle","headline":"Backdoor — HTB Writeup Index","name":"Backdoor","url":"https://rootea.es/en/htb/machines/linux/facil/backdoor","inLanguage":"en","datePublished":"2022-04-23","dateModified":"2026-06-07","about":{"@type":"Thing","name":"Hack The Box (HTB)"},"keywords":"Local File Inclusion (LFI), Local File Inclusion (LFI), WordPress Exploitation, Remote Code Execution (RCE)","isPartOf":{"@type":"WebSite","name":"rootea.es","url":"https://rootea.es"},"author":{"@type":"Organization","name":"rootea.es"},"proficiencyLevel":"Fácil"}`}
</script>

<script type="application/ld+json">
  {`{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://rootea.es/en"},{"@type":"ListItem","position":2,"name":"Linux","item":"https://rootea.es/en/htb/machines/linux/facil/index"},{"@type":"ListItem","position":3,"name":"Easy","item":"https://rootea.es/en/htb/machines/linux/facil/index"},{"@type":"ListItem","position":4,"name":"Backdoor","item":"https://rootea.es/en/htb/machines/linux/facil/backdoor"}]}`}
</script>