> 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/active-directory/kerberos/kerberos-observation-with-wireshark.md).

# Observation de Kerberos avec Wireshark

Notes de sécurité Active Directory pour l'observation de Kerberos avec Wireshark, couvrant l'énumération, Kerberos, les identifiants, l'abus des ACL, le mouvement latéral, le flux de travail d'exploitation et les étapes de validation.

### Observation d'une authentification

Nous ouvrons Wireshark, puis nous nous connectons avec un utilisateur, par exemple :

```
user1
```

Dans Wireshark, vous pouvez filtrer le trafic Kerberos avec :

```
kerberos
```

Nous observons ensuite les échanges :

```bash
AS-REQ
AS-REP
TGS-REQ
TGS-REP
```

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-90df44f66d6cbc4719e40f3d26cd2b2673f97392%2F%7BBB1E1E17-1E72-4CFA-9A55-5C93C28496AC%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

### Exemple d'accès à un partage sans autorisations

De `user2`, nous essayons d'accéder à un partage administratif :

```
cd //WS01/C$
```

Dans Wireshark, nous pouvons observer :

```
TGS-REQ
TGS-REP
Accès SMB refusé
```

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-353387bfc535308105528a3ae872608bf3f57671%2F%7BBEAA2E5F-3867-4FF0-8690-E2E5E50AF4F8%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Cela signifie que :

1. l'utilisateur demande un ticket de service ;
2. le KDC délivre le ticket ;
3. le ticket est présenté au serveur ;
4. le serveur refuse l'accès en raison des autorisations SMB ou NTFS.

### Ticket et authentificateur

Lors de l'accès à un service, le client envoie généralement :

* un ticket de service ;
* un authentificateur.

Le ticket prouve que le KDC a autorisé l'accès au service.

L'authentificateur prouve que le client est bien celui qui utilise le ticket.

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-48cdc3fab929a2114c6b35cc7d41f53cdb9cd9f0%2F%7B1F228000-B616-47CB-B34B-20A5DB584B21%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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