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

From IBM DB2 V10.5 LUW Security Technical Implementation Guide

Part of SRG-APP-000120-DB-000061

Associated with: CCI-000164

SV-89131r1_rule The audit information produced by DB2 must be protected from unauthorized deletion.

Vulnerability discussion

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 deletion. This requirement can be achieved through multiple methods which will depend upon system architecture and design.Some commonly employed methods include: ensuring log files enjoy the proper file system permissions utilizing file system protections; restricting access; and backing up log data to ensure log data is retained.Applications providing a user interface to audit data will leverage user permissions and roles identifying the user accessing the data and the corresponding rights the user enjoys in order make access decisions regarding the deletion of audit data.Audit information includes all information (e.g., audit records, audit settings, and audit reports) needed to successfully audit information system activity.Deletion of database audit data could mask the theft of, or the unauthorized modification of, sensitive data stored in the database.

Check content

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

Fix text

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.

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