SQL Server must limit privileges to change software modules, to include stored procedures, functions, and triggers, and links to software external to SQL Server.

From MS SQL Server 2016 Database Security Technical Implementation Guide

Associated with: CCI-001499

SV-93783r1_rule SQL Server must limit privileges to change software modules, to include stored procedures, functions, and triggers, and links to software external to SQL Server.

Vulnerability discussion

If the system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process.Accordingly, only qualified and authorized individuals shall be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.Unmanaged changes that occur to the database software libraries or configuration can lead to unauthorized or compromised installations.

Check content

Obtain a listing of schema ownership from the server documentation. Execute the following query to obtain a current listing of schema ownership. SELECT S.name AS schema_name, P.name AS owning_principal FROM sys.schemas S JOIN sys.database_principals P ON S.principal_id = P.principal_id ORDER BY schema_name If any schema is owned by an unauthorized database principal, this is a finding.

Fix text

Transfer ownership of database schemas to authorized database principals. ALTER AUTHORIZATION ON SCHEMA::[] TO []

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