The SEL-2740S must authenticate Network Time Protocol 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-104419r2_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Deploy the NTP server within the private network. Provision both the physical path and redundant path between the switch and NTP server to ensure NTP packets only traverse the private network. Use multilayer packet inspection at each hop of the switches to whitelist only the intended NTP clients and server can communicate to each other.