> 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/ja/active-directory/kerberos/as-rep-roasting.md).

# AS-REP Roasting

AS-REP RoastingのためのActive Directoryセキュリティノート。列挙、Kerberos、資格情報、ACL悪用、ラテラルムーブメント、攻撃のワークフロー、検証手順を扱う。

### 原則

**AS-REP Roasting** は、次のオプションで構成された Active Directory アカウントを対象とする手法です:

```bash
Kerberos事前認証を不要にする
```

応答には、ユーザーのパスワードから導出された鍵で暗号化されたデータが含まれています。

このデータは、その後 John the Ripper や Hashcat のようなツールを使ってオフラインで攻撃できます。

### 簡略図

{% code overflow="wrap" %}

```bash
攻撃者
   │
   ├── KDC への AS-REQ
   │
   └── ユーザーのパスワードから導出された鍵で暗号化された AS-REP
                    │
                    └── オフラインでのクラック
```

{% endcode %}

### 危険な理由

この攻撃が危険なのは、次の理由によります:

* 有効な認証情報が必ずしも必要ではないこと;
* KDC に対してリモートで実行できること;
* クラックはオフラインで行われること;
* ユーザーのパスワードの強度に強く依存すること。


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