> 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/pt-br/web/xss/dom-xss-document-write-with-location-search.md).

# XSS DOM document.write com location.search

### XSS de DOM no destino document.write usando a fonte location.search

Este laboratório contém uma vulnerabilidade de DOM do lado do XSS no recurso de rastreamento da consulta de pesquisa. A página usa `document.write` para escrever dados de `location.search` no DOM, que pode ser controlado pela URL.

**Descrição da vulnerabilidade**/ `document.write` é chamada com a `location.search` string sem sanitização. Como a entrada vem diretamente da URL, um invasor pode injetar HTML/JS na página manipulando `location.search`.

<figure><img src="/files/a4d4c13b27b625ece5b70a4edeeea77865df0367" alt=""><figcaption></figcaption></figure>

**Objetivo para resolução** Realize um ataque XSS no lado do DOM que chame a `alert()` função quando a página for carregada.

**Comentários/dicas**/ O código gera algo como uma `<img>` tag contendo um `searchTerms` parâmetro entre aspas, por exemplo:

```html
<img src="/resources/images/tracker.gif?searchTerms=Jordan">
```

<figure><img src="/files/e294973b7c24b955f8619a7cc25ec1d9ad0de118" alt=""><figcaption></figcaption></figure>

Se você fechar a `<img>` tag e as aspas, você pode inserir conteúdo HTML/JS arbitrário.

**Exemplos de payloads testados (fornecidos)**/ Feche a tag e injete HTML:

```html
"><h1>hack</h1>
```

<figure><img src="/files/044c8f8bbe03c834497f962637f44004b319caf4" alt=""><figcaption></figcaption></figure>

Feche a tag e injete um script para acionar `alert`:

```javascript
"><script>alert("xss")</script>
```

<figure><img src="/files/c6c55d791a0eb8c7e4fff3dd13253bef9144b854" alt=""><figcaption></figcaption></figure>


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