Ensure 'Control Server' permission is not granted

高レベル 1手動レビューmssql

説明

The Control Server permission is a highly privileged server-level permission in SQL Server database engine. Moreover, even though this permission is not as powerful as SYSADMIN role, it has almost most of the permissions of SYSADMIN role. Also, database logins granted control server permission can easily elevate to SYSADMIN role through different exploit techniques which is a serious security problem. This will greatly reduce attack surface, as accounts that get compromised by attackers with Control Server permission can escalate to SYSADMIN role. So, attackers can’t break into the database system with highly privileged accounts. Revoking control server permission will prevent privilege elevation attacks.

チェック方法

監査方法: 手動レビュー

この推奨事項は自動ではチェックできません。--include-manual を指定すると、スキャン結果にこの手順付きで一覧表示されます。

Execute this SQL query to list all SQL Server logins with Control Server permission: SELECT sys.server_permissions.type, sys.server_permissions.permission_name, sys.server_permissions.state, sys.server_permissions.state_desc, granteeserverprincipal.name AS grantee_principal_name, granteeserverprincipal.type_desc AS grantee_principal_type_desc, grantorserverprinicipal.name AS grantor_name, CASE WHEN sys.server_permissions.state = N'W' THEN N'GRANT' ELSE sys.server_permissions.state_desc END + N' ' + sys.server_permissions.permission_name COLLATE SQL_Latin1_General_CP1_CI_AS + N' TO ' + QUOTENAME(granteeserverprincipal.name) AS permissionstatement FROM sys.server_principals AS granteeserverprincipal INNER JOIN sys.server_permissions ON sys.server_permissions.grantee_principal_id = granteeserverprincipal.principal_id INNER JOIN sys.server_principals AS grantorserverprinicipal ON grantorserverprinicipal.principal_id = sys.server_permissions.grantor_principal_id WHERE sys.server_permissions.permission_name='CONTROL SERVER' AND granteeserverprincipal.name <> '##MS_PolicySigningCertificate##';

修正方法

修正方法: ガイダンスまたは IaC パッチ

Remove any un-allowed SQL Server accounts which are granted Control Server using this query: use [master] GO REVOKE CONTROL SERVER FROM <login_name>

プロパティ

オペレーティングシステム: すべて
タグ: access-controlmssqlsqlserver-2022
参照: CIS Microsoft SQL Server 2022 Benchmark v1.3.0 - 3.14 Ensure 'Control Server' permission is not granted