From MS SQL Server 2016 Instance Security Technical Implementation Guide
Part of SRG-APP-000118-DB-000059
Associated with: CCI-000162
If audit data were to become compromised, then competent forensic analysis and discovery of the true source of potentially malicious system activity is difficult, if not impossible, to achieve. In addition, access to audit records provides information an attacker could potentially use to his or her advantage.
Obtain the SQL Server audit file location(s) by running the following SQL script: SELECT log_file_path AS "Audit Path" FROM sys.server_file_audits For each audit, the path column will give the location of the file. Verify that all audit files have the correct permissions by doing the following for each audit file: Navigate to audit folder location(s) using a command prompt or Windows Explorer. Right-click the file/folder and click "Properties". On the "Security" tab, verify that at most the following permissions are applied: Administrator (read) Users (none) Audit Administrator (Full Control) Auditors group (Read) SQL Server Service SID OR Service Account (Full Control) [Notes 1, 2] SQL Server SQL Agent Service SID OR Service Account, if SQL Server Agent is in use. (Read, Execute, Write) If any less restrictive permissions are present (and not specifically justified and approved), this is a finding.
Modify audit file permissions to meet the requirement to protect against unauthorized access. Navigate to audit folder location(s) using a command prompt or Windows Explorer. Right-click the file and click "Properties". On the Security tab, modify the security permissions to: Administrator (read) Users (none) Audit Administrator(Full Control) Auditors group (Read) SQL Server Service SID OR Service Account (Full Control) [Notes 1, 2] SQL Server SQL Agent Service SID OR Service Account, if SQL Server Agent is in use. (Read, Execute, Write) [Notes 1, 2] ----- Note 1: It is highly advisable to use a separate account for each service. When installing SQL Server in single-server mode, you can opt to have these provisioned for you. These automatically-generated accounts are referred to as virtual accounts. Each virtual account has an equivalent Service SID, with the same name. The installer also creates an equivalent SQL Server login, also with the same name. Applying folder and file permissions to Service SIDs, rather than to domain accounts or local computer accounts, provides tighter control, because these permissions are available only to the specific service when it is running, and not in any other context. (However, when using failover clustering, a domain account must be specified at installation, rather than a virtual account.) For more on this topic, see http://msdn.microsoft.com/en-us/library/ms143504(v=sql.130).aspx. Note 2: Tips for adding a service SID/virtual account to a folder's permission list. 1) In Windows Explorer, right-click the folder and select "Properties". 2) Select the "Security" tab. 3) Click "Edit". 4) Click "Add". 5) Click "Locations". 6) Select the computer name. 7) Search for the name. 7.a) SQL Server Service 7.a.i) Type "NT SERVICE\MSSQL" and click "Check Names". (What you have just typed in is the first 16 characters of the name. At least one character must follow "NT SERVICE\"; you will be presented with a list of all matches. If you have typed in the full, correct name, step 7.a.ii is bypassed.) 7.a.ii) Select the "MSSQL$" user and click "OK". 7.b) SQL Agent Service 7.b.i) Type "NT SERVICE\SQL" and click "Check Names". 7.b.ii) Select the "SQLAgent$" user and click "OK". 8) Click "OK". 9) Permission like a normal user from here.
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