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

# 由参数控制的不可预测 GUID

#### 由参数控制的用户ID

本实验展示了一个 **水平权限提升** 用户账户页面上的问题。/ 特点是 **用户通过 GUID 进行标识**，即长且随机的凭证，例如：

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

连接到账户后 **wiener:peter**，你可以在“我的账户”部分看到自己的 GUID。

<figure><img src="/files/1d560e36000b2681eb58e2065da6031a75e84d8f" alt=""><figcaption></figcaption></figure>

#### **通过发布内容恢复 GUID**

通过浏览网站，我们在 **可见的发布内容** 中找到其他用户的 GUID：

* 管理员的 GUID 出现在他的某一条帖子中。

<figure><img src="/files/679fc46c43b02bab68ee8aed60ce60608c2f5db7" alt=""><figcaption></figcaption></figure>

同样，我们可以从 **carlos**.

<figure><img src="/files/9e7605aef3206f28b8aac6e3c714ed066dd08c37" alt=""><figcaption></figcaption></figure>

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

#### **操作：访问 Carlos 的账户**

账户页面可通过一个可控参数访问：

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

只需将我们的 GUID 替换为 **carlos**，我们就能访问他的账户：

<figure><img src="/files/03979fd97cc665c94adb6f51bec9062d217a01f4" alt=""><figcaption></figcaption></figure>


---

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