SQL Server must restrict access to sensitive information to authorized user roles.

From Microsoft SQL Server 2012 Database Instance Security Technical Implementation Guide

Part of SRG-APP-000062-DB-000011

Associated with: CCI-000037

SV-53421r2_rule SQL Server must restrict access to sensitive information to authorized user roles.

Vulnerability discussion

Applications employ the concept of least privilege for specific duties and information systems (including specific functions, ports, protocols, and services). The concept of least privilege is also applied to information system processes, ensuring that the processes operate at privilege levels no higher than necessary to accomplish required organizational missions and/or functions. Organizations consider the creation of additional processes, roles, and information system accounts as necessary to achieve least privilege. Organizations also apply least privilege concepts to the design, development, implementation, and operations of information systems.Unauthorized access to sensitive data may compromise the confidentiality of personnel privacy, threaten national security or compromise a variety of other sensitive operations. Access controls are best managed by defining requirements based on distinct job functions and assigning access based on the job function assigned to the individual user.

Check content

Obtain the list of available user-defined server roles from system documentation. Obtain the list of available user-defined server roles from the SQL Server system by running the following script: /********************************************************************************** LIST ALL INDIRECT (via ROLES) ACCESS TO THE SERVER PERMISSION. ***********************************************************************************/ DECLARE @admin_Account_name sysname SET @admin_Account_name = 'NO admin ACCOUNT found' DECLARE @server_name sysname SET @server_name = 'NO Server found' SELECT @server_name = name FROM sys.servers WHERE server_id = 0 SET @admin_Account_name = @server_name + '\Administrator' SELECT pe.grantee_principal_id , pr.type AS 'Grantee_Type' , pr.name AS 'Grantee_Name' , pe.type , pe.permission_name , pe.state , pe.state_desc FROM sys.server_permissions pe JOIN sys.server_principals pr ON pe.grantee_principal_id = pr.principal_id JOIN sys.server_principals ps ON pe.grantor_principal_id = ps.principal_id LEFT JOIN sys.server_principals us ON us.principal_id = pe.major_id WHERE pr.type IN ('R') AND pe.grantee_principal_id > 10 AND NOT pr.name IN ('##MS_PolicyEventProcessingLogin##', '##MS_PolicyTsqlExecutionLogin##', 'NT AUTHORITY\NETWORK SERVICE', 'NT AUTHORITY\SYSTEM', 'NT SERVICE\MSSQLSERVER', 'NT SERVICE\SQLSERVERAGENT', 'NT SERVICE\SQLWriter', 'NT SERVICE\Winmgmt') AND NOT pr.name = @admin_Account_name ORDER BY CASE pe.state WHEN 'D' THEN 1 WHEN 'W' THEN 2 WHEN 'G' THEN 3 ELSE 4 END If any listed user-defined roles are not found in the system documentation, this is a finding. Obtain the list assigned privileges for all user-defined roles in the system documentation. Check all SQL Server user-defined server roles for access rights as it relates to the separation of duties. Repeat steps for each user-defined server role. Navigate to SQL Server Management Studio >> Object Explorer >> <'SQL Server name'> >> Security >> Server Roles >> right click <'user-defined server role name'> >> Properties >> General >> Securables. If any user-defined role is assigned privileges that are not documented in the system documentation, this is a finding. If any user-defined role contains permissions that are inconsistent with separation sensitive information assignment, this is a finding. If system access requires more than one level of sensitive information access and the user-defined role names do not clearly differentiate between the different levels of sensitive information, this is a finding.

Fix text

Add the user-defined server role to the system documentation. Add the assigned privileges of the user-defined server role to the system documentation. Remove the user from direct access to server permission by running the following script: USE master REVOKE <'server permission name'> TO <'account name'> CASCADE Remove server role permission from the user-defined server role by running the following script: USE master REVOKE <'server role name'> TO [<'server role name'>] Rename the user-defined role by running the following script: USE master ALTER SERVER ROLE [<'old role name'>] WITH NAME = [<'new role name'>]

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