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IBM z/OS PARMLIB CLOCKxx must have the Accuracy PARM coded properly.


Finding ID Version Rule ID IA Controls Severity
V-223553 ACF2-OS-000170 SV-223553r533198_rule Medium
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).
IBM z/OS ACF2 Security Technical Implementation Guide 2022-06-22


Check Text ( C-25226r500794_chk )
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 (F-25214r500795_fix)
Define the CLOCKxx statement to include the ACCURACY parm set to "1000".