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The system must not respond to ICMP broadcast netmask requests.


Overview

Finding ID Version Rule ID IA Controls Severity
V-216371 SOL-11.1-050040 SV-216371r603267_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 SPARC Security Technical Implementation Guide 2022-11-18

Details

Check Text ( C-17607r371201_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-17605r371202_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