DB2 must produce audit records of its enforcement of access restrictions associated with changes to the configuration of DB2 or database(s).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-74593	DB2X-00-008200	SV-89267r1_rule		Medium

Description
Without auditing the enforcement of access restrictions against changes to configuration, it would be difficult to identify attempted attacks and an audit trail would not be available for forensic investigation for after-the-fact actions. Enforcement actions are the methods or mechanisms used to prevent unauthorized changes to configuration settings. Enforcement action methods may be as simple as denying access to a file based on the application of file permissions (access restriction). Audit items may consist of lists of actions blocked by access restrictions or changes identified after the fact.

Description

Without auditing the enforcement of access restrictions against changes to configuration, it would be difficult to identify attempted attacks and an audit trail would not be available for forensic investigation for after-the-fact actions. Enforcement actions are the methods or mechanisms used to prevent unauthorized changes to configuration settings. Enforcement action methods may be as simple as denying access to a file based on the application of file permissions (access restriction). Audit items may consist of lists of actions blocked by access restrictions or changes identified after the fact.

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

Details

Check Text ( C-74479r1_chk )
To audit changes in configuration, the SYSADMIN category needs to be audited at both the instance level and the database level. Run the following command to ensure that the SYSADMIN category is being audited at the instance level: $db2audit describe If Log system administrator events is not set to “Both”, this is a finding. Run the following SQL statement to ensure that an audit policy exists at the database level: DB2> SELECT AUDITPOLICYNAME, AUDITPOLICYID FROM SYSCAT.AUDITUSE WHERE OBJECTTYPE = ' ' If no rows are returned, this is a finding. For the audit policy returned in the statement above, run the following SQL statement to confirm that the SYSADMIN category is part of that policy and the ERROR TYPE='A': DB2> SELECT AUDITPOLICYNAME, SYSADMINSTATUS, CONTEXTSTATUS, ERRORTYPE AS ERRORTYPE FROM SYSCAT.AUDITPOLICIES WHERE AUDITPOLICYID = If the values for SYSADMINSTATUS and CONTEXTSTATUS are not 'B' (Both) or ERRORTYPE is not 'A' (Audit), this is a finding.

Check Text ( C-74479r1_chk )

To audit changes in configuration, the SYSADMIN category needs to be audited at both the instance level and the database level.

Run the following command to ensure that the SYSADMIN category is being audited at the instance level:

$db2audit describe

If Log system administrator events is not set to “Both”, this is a finding.

Run the following SQL statement to ensure that an audit policy exists at the database level:
DB2> SELECT AUDITPOLICYNAME, AUDITPOLICYID
FROM SYSCAT.AUDITUSE
WHERE OBJECTTYPE = ' '

If no rows are returned, this is a finding.

For the audit policy returned in the statement above, run the following SQL statement to confirm that the SYSADMIN category is part of that policy and the ERROR TYPE='A':
DB2> SELECT AUDITPOLICYNAME, SYSADMINSTATUS, CONTEXTSTATUS, ERRORTYPE AS ERRORTYPE
FROM SYSCAT.AUDITPOLICIES
WHERE AUDITPOLICYID =

If the values for SYSADMINSTATUS and CONTEXTSTATUS are not 'B' (Both) or ERRORTYPE is not 'A' (Audit), this is a finding.

Fix Text (F-81193r1_fix)
Run the following command to set the auditing at the instance level: $db2audit configure scope sysadmin status both error type audit Run the following command to set the auditing at the database level: DB2> CREATE AUDIT POLICY CATEGORIES SYSADMIN STATUS BOTH, CONTEXT STATUS BOTH ERROR TYPE AUDIT Run the following command if the auditing policy exists but does not include the sysadmin category: DB2> ALTER AUDIT POLICY SYSADMIN STATUS BOTH, CONTEXT STATUS BOTH ERROR TYPE AUDIT If CREATE was used above, apply the policy created above to the database: DB2> AUDIT DATABASE USING POLICY Note: See the following page for knowledgebase information regarding the ALTER AUDIT POLICY: http://www.ibm.com/support/knowledgecenter/SSEPGG_10.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r0050608.html?lang=en

Fix Text (F-81193r1_fix)

Run the following command to set the auditing at the instance level:

$db2audit configure scope sysadmin status both error type audit

Run the following command to set the auditing at the database level:
DB2> CREATE AUDIT POLICY CATEGORIES SYSADMIN STATUS BOTH, CONTEXT STATUS BOTH ERROR TYPE AUDIT

Run the following command if the auditing policy exists but does not include the sysadmin category:
DB2> ALTER AUDIT POLICY SYSADMIN STATUS BOTH, CONTEXT STATUS BOTH ERROR TYPE AUDIT

If CREATE was used above, apply the policy created above to the database:
DB2> AUDIT DATABASE USING POLICY

Note: See the following page for knowledgebase information regarding the ALTER AUDIT POLICY:
http://www.ibm.com/support/knowledgecenter/SSEPGG_10.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r0050608.html?lang=en