The system must not respond to ICMP broadcast netmask requests.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216134	SOL-11.1-050040	SV-216134r603268_rule		Low

Description
By determining the netmasks of various computers in your network, an attacker can better map your subnet structure and infer trust relationships.

STIG	Date
Solaris 11 X86 Security Technical Implementation Guide	2021-03-01

Details

Check Text ( C-17372r372784_chk )
Determine if the response to address mask broadcast is disabled. # ipadm show-prop -p _respond_to_address_mask_broadcast -co current ip If the output of this command is not "0", this is a finding.

Fix Text (F-17370r372785_fix)
The Network Management profile is required. Disable responses to address mask broadcast. # pfexec ipadm set-prop -p _respond_to_address_mask_broadcast=0 ip