AOS must authenticate Network Time Protocol (NTP) sources using authentication that is cryptographically based.
An XCCDF Rule
Description
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.
- ID
- SV-266976r1039949_rule
- Version
- ARBA-ND-000347
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Configure AOS with the following commands:
configure terminal
ntp authentication-key (keyid #> sha1 <plaintext key>
ntp trusted-key <keyid #>
ntp server <first fqdn, ipv4, or ipv6 address> key <keyid #>
ntp server <second fqdn, ipv4, or ipv6 address> key <keyid #>