TMA-MSSQL-3.2

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

MediaNivel 1Automatizadamssql

Descripción

Remove the right of the guest user to connect to SQL Server databases, except for master, msdb, tempdb, and, on AWS RDS instances, rdsadmin. Iterates all online user databases (master, tempdb and msdb excluded; on AWS RDS rdsadmin is also acceptable). Default: The guest user cannot have the CONNECT permission revoked in master, msdb, tempdb, and, on AWS RDS instances, rdsadmin; however, this permission should be revoked in all other databases on the ... Runs one sqlcmd query with its defaults (Windows authentication to the local default instance); set SQLCMDSERVER, SQLCMDUSER and SQLCMDPASSWORD for another instance or SQL authentication. Needs VIEW SERVER STATE / sysadmin-level read access.

Cómo se verifica

Método de auditoría: 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;"

Salida esperada: 0

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

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;

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: mssqldatabaseprivileges
Referencia: CIS Microsoft SQL Server 2025 Benchmark v1.0.0 - 3.2 Ensure CONNECT permissions on the 'guest' user is Revoked within all SQL Server databases

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target mssql