The system must not respond to ICMP broadcast netmask requests.

From Solaris 11 X86 Security Technical Implementation Guide

Part of SRG-OS-999999

Associated with: CCI-000366

SV-61049r1_rule The system must not respond to ICMP broadcast netmask requests.

Vulnerability discussion

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

Check content

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

The Network Management profile is required. Disable responses to address mask broadcast. # pfexec ipadm set-prop -p _respond_to_address_mask_broadcast=0 ip

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