Title

IBM z/OS PARMLIB CLOCKxx must have the Accuracy PARM coded properly. (Cat II impact)

Discussion

Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time, a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate. Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network. Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints).

Check Content

Refer to the CLOCKxx member of PARMLIB. If the ACCURACY parm is not coded, this is a finding. If the ACCURACY parm is coded to "1000", this is not a finding.

Fix Text

Define the CLOCKxx statement to include the ACCURACY parm set to "1000".

Additional Identifiers

Rule ID: SV-223553r853545_rule

Vulnerability ID: V-223553

Group Title: SRG-OS-000356-GPOS-00144

Expert Comments

CCIs tied to check.

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