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

From HP-UX 11.31 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-35026r1_rule The system must not respond to Internet Control Message Protocol (ICMP) timestamp requests sent to a broadcast address.

Vulnerability 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

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