Title

The IBM z/OS system administrator (SA) must develop a process notify appropriate personnel when accounts are modified. (Cat II impact)

Discussion

Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to modify an existing account. Notification of account modification is one method for mitigating this risk. A comprehensive account management process will ensure an audit trail which documents the modification of operating system user accounts and notifies the SA and information system security officer (ISSO) of changes. Such a process greatly reduces the risk that accounts will be surreptitiously created and provides logging that can be used for forensic purposes. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Check Content

Ask the SA for the documented process to notify appropriate personnel when accounts are modified. If there is no documented process, this is a finding.

Fix Text

Develop a documented process to notify appropriate personnel when accounts are modified.

Additional Identifiers

Rule ID: SV-223541r1001140_rule

Vulnerability ID: V-223541

Group Title: SRG-OS-000275-GPOS-00105

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.