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-216134r959010_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. |
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 |