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

# Noter

> Verified writeups for the Noter machine of Hack The Box

# Noter

<p className="machine-summary"><span className="prompt"><code>\$ tldr</code></span> JWT Flask-Unsign → md-to-pdf 4.1.0 RCE → privesc</p>

<div className="machine-meta">
  | ·                | ·                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
  | ---------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  | Operating system | Linux                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
  | Difficulty       | Medium                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
  | Vector           | <span className="vbadge vbadge-web">Web</span>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
  | IP               | `10.10.11.160`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
  | Retirement date  | 2022-09-28                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
  | Skills           | Information Leakage - User Enumeration \[Brute-Force Wfuzz] Finding valid users - Wfuzz SSTI (Server Side Template Injection) \[Failed] JWT Enumeration Abusing JWT - Flask-Unsign Cracking Flask Cookie Secret - Flask-Unsign Cookie Hijacking FTP Enumeration Information Leakage in PDF document Finding a command injection in the web RCE in md-to-pdf 4.1.0 Abusing the vulnerable code definition - Alternative Command Injection (RCE) Abusing MYSQL service running as the root user \[Privilege Escalation] (raptor\_udf2.so) |
</div>

## Writeups

| Language | Author                   | Format | Link                                                                                  |
| -------- | ------------------------ | ------ | ------------------------------------------------------------------------------------- |
| 🇪🇸 ES  | **S4vitar**              | Vídeo  | [Open](https://www.youtube.com/watch?v=FoFQgoDYzog)                                   |
| 🇪🇸 ES  | **El Pingüino de Mario** | Vídeo  | [Open](https://www.youtube.com/watch?v=_ab_HVP_lRc)                                   |
| 🇬🇧 EN  | **0xdf**                 | Texto  | [Open](https://0xdf.gitlab.io/2022/09/03/htb-noter.html)                              |
| 🇬🇧 EN  | **0xdf**                 | Texto  | [Open](https://0xdf.gitlab.io/2022/09/28/htb-noter-alternative-root-first-blood.html) |
| 🇬🇧 EN  | **IppSec**               | Vídeo  | [Open](https://www.youtube.com/watch?v=XvoMwz9J6_I)                                   |

## Skill resources

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

| Skill                                 | Source      | Link                                                                                          |
| ------------------------------------- | ----------- | --------------------------------------------------------------------------------------------- |
| SSTI (Server-Side Template Injection) | PortSwigger | [Open](https://portswigger.net/web-security/server-side-template-injection)                   |
| Information Leakage                   | HackTricks  | [Open](https://book.hacktricks.wiki/en/pentesting-web/information-leak.html)                  |
| OS Command Injection                  | PortSwigger | [Open](https://portswigger.net/web-security/os-command-injection)                             |
| Directory fuzzing                     | HackTricks  | [Open](https://book.hacktricks.wiki/en/network-services-pentesting/pentesting-web/index.html) |
| Remote Code Execution (RCE)           | HackTricks  | [Open](https://book.hacktricks.wiki/en/pentesting-web/command-injection.html)                 |
| JSON Web Tokens (JWT)                 | PortSwigger | [Open](https://portswigger.net/web-security/jwt)                                              |

## Related skills worth mastering

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

## If you liked this machine, try

* [Player](/en/htb/machines/linux/dificil/player) — Linux, Hard
* [Backend](/en/htb/machines/linux/medio/backend) — Linux, Medium
* [BackendTwo](/en/htb/machines/linux/medio/backendtwo) — Linux, Medium
* [Flustered](/en/htb/machines/linux/medio/flustered) — Linux, Medium
* [Doctor](/en/htb/machines/linux/facil/doctor) — Linux, Easy

***

## 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:noter" data-giscus-lang="en" />

*Last updated: 2026-06-07*

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