> 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/access-control/user-id-controlled-by-parameter-unpredictable-guid.md).

# パラメータで制御される予測不能なGUIDを持つユーザーID

パラメータで制御される予測不能なGUIDを持つユーザーIDの PortSwigger Web Security Academy ラボ向けノート。攻撃フロー、ペイロードテスト、Burp Suite による検証、および是正策の文脈を含みます。

#### パラメータで制御されるユーザーID

このラボでは **水平権限昇格** ユーザーアカウントページ上の問題。/ 特徴は **ユーザーはGUIDで識別される**、つまり長くランダムな認証情報で、例えば：

```bash
9e2f3fc0-7035-48ed-ad6d-f643690c7b9d
```

アカウントに接続すると **wiener:peter**、［マイアカウント］セクションで自分のGUIDを確認できます。

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-1a4b31aaae17a8498c760d2d34a450ca27da9158%2Fimage%20(268).png?alt=media" alt=""><figcaption></figcaption></figure>

#### **投稿を通じたGUIDの取得**

サイトを閲覧すると、 **表示されている投稿** に他のユーザーのGUIDが見つかる：

* 管理者のGUIDは彼の投稿の1つに表示されている。

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-d3986f80c0b30028730db5f85d5c799ecb875646%2Fimage%20(269).png?alt=media" alt=""><figcaption></figcaption></figure>

同様に、GUIDを次から取得できる： **carlos**.

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-7a67cce120c504b0da7e8cc1a7789bf06cbcbb1b%2Fimage%20(270).png?alt=media" alt=""><figcaption></figcaption></figure>

```bash
?userId=5abc76d3-7763-4be9-83d1-c6181bcdf0b5
```

#### **操作: Carlosのアカウントへのアクセス**

アカウントページは制御可能なパラメータを通じてアクセスできる：

```bash
my-account?id=5abc76d3-7763-4be9-83d1-c6181bcdf0b5
```

自分のGUIDを置き換えるだけで **carlos**、彼のアカウントにアクセスできる：

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-6215ffb1c858fefb2e9f8b36c932c2079f2fda1c%2Fimage%20(271).png?alt=media" alt=""><figcaption></figcaption></figure>


---

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