The Riverbed NetProfiler must be configured to authenticate Network Time Protocol (NTP) sources using authentication that is cryptographically based.
An XCCDF Rule
Description
<VulnDiscussion>If NTP 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-256089r882775_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Go to Administration >> General Settings.
Under "Time Configuration", change the "Encryption" for the NTP Servers to "SHA-1", and under the Key and Index columns, enter the value that corresponds to each NTP server.