> 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/de/web/xss/xss-in-template-literal-with-escaped-unicode.md).

# XSS in einer literalen Vorlage mit maskierten Unicode-Zeichen

Notizen zu XSS in einer literalen Vorlage mit maskierten Unicode-Zeichen für Labs der PortSwigger Web Security Academy, einschließlich Ausnutzungs-Workflow, Payload-Tests, Burp-Suite-Validierung und Behebungskon

### Reflektiertes XSS in ein Template-Literal mit spitzen Klammern, einfachen und doppelten Anführungszeichen, Backslash und per Unicode-Escape maskierten Backticks

XSS in einem Literal-Template (Backticks) reflektiert, wobei `<` und `>` spitze Klammern sowie einfache und doppelte Anführungszeichen kodiert sind und der Backtick per Unicode-Escape maskiert ist. Das Ziel: die Ausführung von `alert()` innerhalb des Zeichenketten-Templates.

Der Suchparameter wird in einem JavaScript-Literal-Template reflektiert. Die Template-Zeichenkette muss unterbrochen werden, um `alert()` vom reflektierten Wert.

<pre class="language-javascript"><code class="lang-javascript">var message = `2 Suchergebnisse für 'test'`;
<strong>document.getElementById('searchMessage').innerText = message;
</strong></code></pre>

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-9e01c413822a528e8f8d508cfceb5670682a6e59%2Fimage%20(416).png?alt=media" alt=""><figcaption></figcaption></figure>

* Das Backtick-Zeichen (`` ` ``) begrenzt das Template-Literal; die Seite maskiert den vom Benutzer gelieferten Backtick (zum Beispiel mittels Unicode-Escaping), wodurch ein einfacher Ausbruch verhindert wird.

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-cd683beaa7d8cf19d1e69181029ae28e5e62a1e4%2Fimage%20(417).png?alt=media" alt=""><figcaption></figcaption></figure>

Beispiel für den Unterschied bei JS-Interpolation (Illustration):

```javascript
variable = "Testen";
console.log("Die Variable ist: ${variable}")
console.log(`Die Variable ist: ${variable}`)
```

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-0c6d0eada5a823250cbb20521a0c5dffabd0b8aa%2Fimage%20(418).png?alt=media" alt=""><figcaption></figcaption></figure>

Die erste Zeile zeigt wörtlich `${variable}`, die zweite interpretiert die Variable mit Backticks.

* Versuch, einen Interpolationsausdruck einzufügen, der `alert()`:

```javascript
${alert(0)}
```

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-ab6acd9b60a371feb6d804be4b5282f96fee3f97%2Fimage%20(419).png?alt=media" alt="" width="520"><figcaption></figcaption></figure>


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