Title

The system must not process ICMP timestamp requests. (Cat III impact)

Discussion

The processing of Internet Control Message Protocol (ICMP) timestamp requests increases the attack surface of the system.

Check Content

Determine the type of zone that you are currently securing. # zonename If the zone is not the global zone, determine if any interfaces are exclusive to the zone: # dladm show-link If the output indicates "insufficient privileges" then this requirement is not applicable. If the zone is the global zone or the non-global zone has exclusive interfaces verify the system does not respond to ICMP timestamp requests. # ndd /dev/ip ip_respond_to_timestamp If the result is not 0, this is a finding.

Fix Text

Disable ICMP timestamp responses on the system. # ndd -set /dev/ip ip_respond_to_timestamp 0 Also add this command to a system startup script.

Additional Identifiers

Rule ID: SV-226890r603265_rule

Vulnerability ID: V-226890

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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