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V-74041

The Cisco IOS XE router must compare internal information system clocks at least every 24 hours with an authoritative time server.

Finding ID
CISR-ND-000100
Rule ID
SV-88715r2_rule
Severity
Cat II
CCE
(None)
Group Title
SRG-APP-000371-NDM-000296
CCI
CCI-001891
Target Key
(None)
Documentable
No
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 of the configured acceptable allowance (drift) may be inaccurate. Additionally, unnecessary synchronization may have an adverse impact on system performance and may indicate malicious activity. Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.

Fix Text

Configure the router to use NTP. The configuration should look similar to the example below: ntp authentication-key 1 md5 072C285F4D06 7 ntp authenticate ntp trusted-key 1 ntp server 1.1.1.1 key 1

Check Content

Verify that at least two NTP servers are configured and that system clocks update the time every 24 hours. The configuration should look similar to the example below: ntp authentication-key 1 md5 072C285F4D06 7 ntp authenticate ntp trusted-key 1 ntp server 1.1.1.1 key 1 If there are not at least two NTP servers configured, and clocks are updated at least every 24 hours, this is a finding.