Title

The Riverbed NetProfiler must be configured to authenticate Network Time Protocol (NTP) sources using authentication that is cryptographically based. (Cat II impact)

Discussion

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.

Check Content

Go to Administration >> General Settings. Under "Time Configuration", verify the "Encryption" for the NTP servers is set to "SHA-1" and the Key and Index columns have a value that corresponds to each NTP server. If SHA-1 is not configured for the NTP servers, this is a finding.

Fix Text

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.

Additional Identifiers

Rule ID: SV-256089r882775_rule

Vulnerability ID: V-256089

Group Title: SRG-APP-000395-NDM-000347

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.