The ICS must be configured to authenticate Network Time Protocol (NTP) sources using authentication that is cryptographically based.
An XCCDF Rule
Description
<VulnDiscussion>If Network Time Protocol is not authenticated, an attacker can introduce a rogue NTP server. This rogue server can then be used to send incorrect time information to network devices, which will make log timestamps inaccurate and affect scheduled actions. NTP authentication is used to prevent this tampering by authenticating the time source.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-258603r930497_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
In the ICS Web UI, navigate to System >> Status >> Dashboard.
1. Click the "Overview" tab.
2. Under "Appliance Details" and "System Date and Time" select "Edit".
3. Select the Time Zone to use - DOD may require GMT.
4. Select "Use Pool of NTP servers".
5. Enter the IP/hostname of each NTP server in the "NTP Server 1", "NTP Server 2", etc.