The system must not respond to ICMP broadcast netmask requests.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| low | V-216371 | SRG-OS-000480 | SOL-11.1-050040 | SV-216371r959010_rule | 2026-02-19 | 3 |
Description
By determining the netmasks of various computers in your network, an attacker can better map your subnet structure and infer trust relationships.
ℹ️ Check
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
The Network Management profile is required.
Disable responses to address mask broadcast.
# pfexec ipadm set-prop -p _respond_to_address_mask_broadcast=0 ip