The system must not respond to ICMP broadcast timestamp requests.

By accurately determining the system's clock state, an attacker can more effectively attack certain time-based pseudorandom number generators (PRNGs) and the authentication systems that rely on them.

Determine if response to ICMP broadcast timestamp requests is disabled.

# ipadm show-prop -p _respond_to_timestamp_broadcast -co current ip

If the output of this command is not "0", this is a finding.

The Network Management profile is required.

Disable respond to timestamp broadcasts.

# pfexec ipadm set-prop -p _respond_to_timestamp_broadcast=0 ip