Ensure CONNECT permissions on the 'guest' user is Revoked within all SQL Server databases

MédiaNível 1Automatizadamssql

Descrição

Remove the right of the guest user to connect to SQL Server databases, except for master, msdb, tempdb, and, on AWS RDS instances, rdsadmin. A login assumes the identity of the guest user when a login has access to SQL Server but does not have access to a database through its own account and the database has a guest user account. Revoking the CONNECT permission for the guest user will ensure that a login is not able to access database information without explicit access to do so.

Como é verificado

Método de auditoria: Consulta SQL

sql_query

sqlcmd -b -h -1 -W -Q "SET NOCOUNT ON; DECLARE @n int = 0, @k int, @db sysname, @s nvarchar(max); DECLARE c CURSOR LOCAL FAST_FORWARD FOR SELECT name FROM sys.databases WHERE state = 0 AND HAS_DBACCESS(name) = 1 AND name NOT IN ('master','tempdb','msdb'); OPEN c; FETCH NEXT FROM c INTO @db; WHILE @@FETCH_STATUS = 0 BEGIN SET @s = N'USE ' + QUOTENAME(@db) + N'; SELECT @k = COUNT(*) FROM (SELECT permission_name FROM sys.database_permissions WHERE grantee_principal_id = DATABASE_PRINCIPAL_ID(''guest'') AND state_desc LIKE ''GRANT%'' AND permission_name = ''CONNECT'') AS x;'; EXEC sp_executesql @s, N'@k int OUTPUT', @k = @k OUTPUT; SET @n = @n + @k; FETCH NEXT FROM c INTO @db; END; CLOSE c; DEALLOCATE c; SELECT @n;"

Saída esperada: 0

Como é corrigido

Método de correção: Orientação ou patch de infraestrutura

The following code snippet revokes CONNECT permissions from the guest user in a database. Replace <database_name> as appropriate: USE <database_name>; GO REVOKE CONNECT FROM guest;

Propriedades

Sistemas operacionais: Qualquer
Tags: access-controlmssqlsqlserver-2022
Referência: CIS Microsoft SQL Server 2022 Benchmark v1.3.0 - 3.2 Ensure CONNECT permissions on the 'guest' user is Revoked within all SQL Server databases

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Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.

shell

tmaegis scan --target mssql