Finding ID | Version | Rule ID | IA Controls | Severity |
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V-74045 | CISR-ND-000102 | SV-88719r2_rule | Medium |
Description |
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The loss of connectivity to a particular authoritative time source will result in the loss of time synchronization (free-run mode) and increasingly inaccurate time stamps on audit events and other functions. Multiple time sources provide redundancy by including a secondary source. Time synchronization is usually a hierarchy; clients synchronize time to a local source while that source synchronizes its time to a more accurate source. The network device must utilize an authoritative time server and/or be configured to use redundant authoritative time sources. This requirement is related to the comparison done in CCI-001891. DoD-approved solutions consist of a combination of a primary and secondary time source using a combination or multiple instances of the following: a time server designated for the appropriate DoD network (NIPRNet/SIPRNet); United States Naval Observatory (USNO) time servers; and/or the Global Positioning System (GPS). The secondary time source must be located in a different geographic region than the primary time source. |
STIG | Date |
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Cisco IOS XE Release 3 NDM Security Technical Implementation Guide | 2018-12-20 |
Check Text ( C-74135r3_chk ) |
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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 ntp server 2.2.2.2 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. |
Fix Text (F-80587r3_fix) |
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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 ntp server 2.2.2.2 key 1 |