The system must not respond to ICMP timestamp requests sent to a broadcast address.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-38798r1_rule The system must not respond to ICMP timestamp requests sent to a broadcast address.

Vulnerability discussion

The processing of Internet Control Message Protocol (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

# /usr/sbin/no -o bcastping If the value returned is not 0, this is a finding.

Fix text

Configure the system to ignore ICMP Timestamp requests sent to broadcast addresses. #no -po bcastping=0

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