The system must not respond to ICMP broadcast netmask requests.
An XCCDF Rule
Description
<VulnDiscussion>By determining the netmasks of various computers in your network, an attacker can better map your subnet structure and infer trust relationships.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-216371r603267_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
The Network Management profile is required.
Disable responses to address mask broadcast.
# pfexec ipadm set-prop -p _respond_to_address_mask_broadcast=0 ip