EP11-00-002700 - The audit information produced by the EDB Postgres Advanced Server must be protected from unauthorized modification.

Information

If audit data were to become compromised, then competent forensic analysis and discovery of the true source of potentially malicious system activity is impossible to achieve.

To ensure the veracity of audit data, the information system and/or the application must protect audit information from unauthorized modification.

This requirement can be achieved through multiple methods that will depend upon system architecture and design. Some commonly employed methods include ensuring log files enjoy the proper file system permissions and limiting log data locations.

Applications providing a user interface to audit data will leverage user permissions and roles identifying the user accessing the data and the corresponding rights that the user enjoys in order to make access decisions regarding the modification of audit data.

Audit information includes all information (e.g., audit records, audit settings, and audit reports) needed to successfully audit information system activity.

Modification of database audit data could mask the theft of, or the unauthorized modification of, sensitive data stored in the database.

Solution

1) Change ownership of EDB Audit directory and its contents to the database service account if they are not owned by the database service account.

If the EDB Audit directory and its contents are not owned by the database service account, change ownership to the service account responsible for running the Advanced Server database service.

This may be done using Windows Explorer:
Browse to the directory where the EDB audit directory folder is located.
Select and right-click on the folder, select 'Properties', select the 'Securities' tab, and select the 'Advanced' button.
Select the 'Change' link shown next to the owner of the folder to change the folder's owner.

Alternatively, the Windows TAKEOWN command or the ICACLS command (with the /SETOWNER option) may be used to change ownership of folders and files using the Windows command prompt.

2) Modify permissions on the EDB Audit directory and its contents to meet the requirement to protect against unauthorized access.

This may be done using Windows Explorer:
Browse to the directory where the EDB audit directory folder is located.
Select and right-click on the folder, select 'Properties', and select the 'Security' tab.
Modify the security permissions to:
NT AUTHORITY/NetworkService (or configured database service account) (Full Control)
Administrators (Read)
Users (none)

Alternatively, the Windows ICACLS command may be used to modify permissions on folders and files using the Windows command prompt.

If other permissions have been granted to other users or groups, ensure the system documentation is updated to note the organizationally approved permission setting and corresponding justification of the permission settings for this requirement.

Item Details

Audit Name: EDB PostgreSQL Advanced Server v11 Windows OS Audit v2r4

Category: AUDIT AND ACCOUNTABILITY

Plugin: Windows

Control ID: 40d356c03d4cd18434f539b2d346c358333b78b62d5a83c51ee80ea102e0eba3

Detections

Analytics

EP11-00-002700 - The audit information produced by the EDB Postgres Advanced Server must be protected from unauthorized modification.

Information

Solution

See Also

Item Details