The audit information produced by DB2 must be protected from unauthorized modification.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-74455	DB2X-00-002300	SV-89129r1_rule		Medium

Description
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.

Description

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.

STIG	Date
IBM DB2 V10.5 LUW Security Technical Implementation Guide	2019-09-27

Details

Check Text ( C-74381r1_chk )
Run the db2audit command to find the value of the datapath where the audit logs are stored. $db2audit describe Only the instance owner needs write access to directory and users authorized to archive the audit logs need to have read access to the audit directory. If any user other than the instance owner has write access to the audit directory, this is a finding. If any user other than the users authorized to read audit log files have read access to audit directory, this is a finding.

Check Text ( C-74381r1_chk )

Run the db2audit command to find the value of the datapath where the audit logs are stored.

$db2audit describe

Only the instance owner needs write access to directory and users authorized to archive the audit logs need to have read access to the audit directory.

If any user other than the instance owner has write access to the audit directory, this is a finding.

If any user other than the users authorized to read audit log files have read access to audit directory, this is a finding.

Fix Text (F-81055r1_fix)
At the operating system level, remove the write permission from non-instance owner users on the audit directory. At the operating system level, remove the read permission from non-authorized users on the audit directory.