Title

The Juniper EX switch must be configured to authenticate Network Time Protocol sources using authentication that is cryptographically based. (Cat III impact)

Discussion

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.

Check Content

Review the network device configuration to determine if the network device authenticates NTP endpoints before establishing a local, remote, or network connection using authentication that is cryptographically based. [edit system ntp] authentication-key 1 type sha256 value "PSK"; ## SECRET-DATA authentication-key 2 type sha1 value "PSK"; ## SECRET-DATA server <address 1> key 1 prefer; ## SECRET-DATA server <address 2> key 2; ## SECRET-DATA trusted-key [ 1 2 ]; If the network device does not authenticate Network Time Protocol sources using authentication that is cryptographically based, this is a finding.

Fix Text

Configure the network device to authenticate Network Time Protocol sources using authentication that is cryptographically based. set system ntp authentication-key 1 type sha256 set system ntp authentication-key 1 value "PSK" set system ntp authentication-key 2 type sha1 set system ntp authentication-key 2 value "PSK" set system ntp server <address 1> key 1 set system ntp server <address 1> prefer set system ntp server <address 2> key 2 set system ntp trusted-key 1 set system ntp trusted-key 2

Additional Identifiers

Rule ID: SV-253926r843811_rule

Vulnerability ID: V-253926

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.