From Microsoft SQL Server 2012 Database Instance Security Technical Implementation Guide
Part of SRG-APP-000133-DB-000207
Associated with: CCI-001499
Backups must be protected from unauthorized deletion and modification. They must also be protected from unauthorized use in database restoration.
Obtain the SQL Server backup directory location: from a command prompt, open the registry editor by typing regedit.exe, and pressing [ENTER]. Navigate to the following registry location:
HKEY_LOCAL_MACHINE
>> SOFTWARE
>> Microsoft
>> Microsoft SQL Server
>> [INSTANCE NAME]
>> MSSQLServer
>> BackupDirectory
In the registry tree, the [INSTANCE NAME] for a SQL Server 2012 database engine instance is normally shown as "MSSQL11" followed by a period and the name that was specified for the SQL Server service at installation time. If multiple SQL Server instances are installed, each will have its own [INSTANCE NAME] node and subtree in the registry.
The value in the Data column for the BackupDirectory registry entry is the file system path for the SQL Server 2012 backups. Also, review backup jobs to identify any additional directories used for backups.
Navigate to each folder location using a command prompt or Windows Explorer. The following instructions assume that Windows Explorer is used.
Verify that backup files and folders have only authorized privileges. Right-click the backup folder, click Properties. On the Security tab, verify that at most the following permissions are present:
CREATOR OWNER (Full Control)
System (Full control)
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]
SQL Server FD Launcher Service SID OR Service Account, if full-text indexing is in use. (Read, Write) [Notes 1, 2]
System Administrators (Full Control) [Note 3]
SQL Server Analysis Services (SSAS) Service SID or Service Account, if SSAS is in use (Read & Execute) [Notes 1, 2]
If any less restrictive permissions are present (and not specifically justified and approved), this is a finding.
Right-click each folder, if any, under the backup folder; click Properties. On the Security tab, verify that at most the permissions listed in the preceding paragraph are present. If any less restrictive permissions are present (and not specifically justified and approved), this is a finding.
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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.110).aspx.
Note 2: Tips for adding a service SID/virtual account to a folder's permission list.
1) In Windows Explorer, right-click on 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$
Navigate to the SQL Server backup directory location. Right-click the folder, click Properties. On the Security tab, modify the security permissions, so that files and folders have at most the permissions listed below. Right-click each folder under the SQL Server backup folder, click Properties. On the Security tab, modify the security permissions, so that at most the following permissions are present.
CREATOR OWNER (Full Control)
System (Full control)
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]
SQL Server FD Launcher Service SID OR Service Account, if full-text indexing is in use. (Read, Write) [Notes 1, 2]
System Administrators (Full Control) [Note 3]
SQL Server Analysis Services (SSAS) Service SID or Service Account, if SSAS is in use (Read & Execute) [Notes 1, 2]
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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.110).aspx.
Note 2: Tips for adding a service SID/virtual account to a folder's permission list.
1) In Windows Explorer, right-click on 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$
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