Title

The system must not respond to Internet Control Message Protocol (ICMP) timestamp requests sent to a broadcast address. (Cat II impact)

Discussion

The processing of ICMP timestamp requests increases the attack surface of the system. Responding to broadcast ICMP timestamp requests facilitates network mapping and provides a vector for amplification attacks.

Check Content

Verify the system does not respond to ICMP timestamp requests set to broadcast addresses. # ndd -get /dev/ip ip_respond_to_timestamp_broadcast If the result is greater than 0, this is a finding.

Fix Text

Configure the system to not respond to ICMP timestamp requests sent to broadcast addresses. # ndd -set /dev/ip ip_respond_to_timestamp_broadcast 0 Edit /etc/rc.config.d/nddconf and add/set: TRANSPORT_NAME[x]=ip NDD_NAME[x]=ip_respond_to_timestamp_broadcast NDD_VALUE[x]=0

Additional Identifiers

Rule ID: SV-35026r1_rule

Vulnerability ID: V-22411

Group Title: GEN003604

Expert Comments

CCIs tied to check.

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