ICMP Timestamp Request Remote Date Disclosure
This entry from Security Metrics is followed up with the following CVE:
Disclosure of this information is described in RFC 792 and has not been superceeded. This is not a risk.
The ICMP stack is required by specification and open standards to behave in this manner. Compliance with this standard is a best practice for the Internet.
No action required.
Users wishing to block specific ICMP requests can do so using the Custom Firewall Rules module from the marketplace.