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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22411	GEN003604	SV-35026r1_rule	ECSC-1	Medium

Description
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.

STIG	Date
HP-UX 11.23 Security Technical Implementation Guide	2015-12-02

Details

Check Text ( C-36504r1_chk )
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 (F-31861r1_fix)
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